AMC


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents


us-gaap:StatementClassOfStock
us-gaap:CommonStockValue
us-gaap:Range, us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:CommonStockSharesAuthorized
us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:StatementClassOfStock, us-gaap:TypeOfArrangement

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
us-gaap:DebtInstrument
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType
us-gaap:IncomeStatementLocation
us-gaap:StatementEquityComponents

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
us-gaap:ProductOrService
us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostsAndExpenses
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
us-gaap:IncomeStatementLocation
us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:IncomeTaxExpenseBenefit
us-gaap:StatementScenario

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestExpense
us-gaap:StatementScenario

us-gaap:InterestExpenseDebt
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:OperatingExpenses

us-gaap:OperatingIncomeLoss

us-gaap:OtherNonoperatingIncomeExpense
us-gaap:DebtInstrument

us-gaap:ProfitLoss
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
us-gaap:TimingOfTransferOfGoodOrService

us-gaap:Revenues
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:Assets
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:Liabilities
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ReceivablesNetCurrent

us-gaap:OtherAssetsCurrent

us-gaap:NoncurrentAssets
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:AssetsNoncurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:ReportingUnit
us-gaap:StatementGeographical

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:IntangibleAssetsNetExcludingGoodwill
us-gaap:FairValueByMeasurementFrequency
us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:OperatingLeaseRightOfUseAsset
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:OtherAssetsNoncurrent
us-gaap:FairValueByMeasurementFrequency
us-gaap:EquitySecuritiesFvNi

us-gaap:AccountsPayableCurrent

us-gaap:LiabilitiesCurrent
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:LongTermDebtCurrent
us-gaap:FairValueByMeasurementBasis

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:LiabilitiesNoncurrent

us-gaap:LongTermDebt

us-gaap:LongTermDebtNoncurrent
us-gaap:FairValueByMeasurementBasis

us-gaap:DeferredFinanceCostsNoncurrentNet

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:MinorityInterest
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:StatementClassOfStock
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock
us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:MinorityInterest
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:CounterpartyName
us-gaap:CounterpartyName, us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
us-gaap:CounterpartyName, us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:AmortizationOfFinancingCosts
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:IncomeStatementLocation

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DepreciationDepletionAndAmortization
us-gaap:StatementScenario

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquireProductiveAssets
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividends
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:CreditFacility
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:Range, us-gaap:CreditFacility
us-gaap:Range, us-gaap:DebtInstrument
us-gaap:Range, us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:Range, us-gaap:LongtermDebtType

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

amch:AccruedDividendEquivalentAdjustment
us-gaap:StatementEquityComponents

amch:AccruedDividendEquivalentAjustment
us-gaap:StatementEquityComponents

amch:AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

amch:AssetImpairmentChargesIncludingNonControllingInterest

amch:AttributableEarningsBeforeInterestTaxesDepreciationAndAmortization
us-gaap:StatementScenario
amch:EquityMethodInvestmentActivityByClassification
amch:BusinessCombinationConsiderationSettlementValueOfUnitsReturnedUnderUnitAdjustmentAgreement

amch:CashBurn
us-gaap:Range, us-gaap:DebtInstrument
amch:CashSavingsDueToInterestPayments
us-gaap:Range, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

amch:ComprehensiveIncomeLossNetOfTaxIncludingInvestmentAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

amch:ContractWithCustomerLiabilityForeignCurrencyTranslationAdjustment
amch:EquityMethodInvestmentActivityByClassification
amch:ContractWithCustomerLiabilityRevenueReclassed
us-gaap:ProductOrService

amch:ContractsWithCustomersCashReceivedInAdvance
amch:EquityMethodInvestmentActivityByClassification
amch:ContractsWithCustomersDeferredRevenueNegativeCommonUnitAdjustment
us-gaap:DebtInstrument
amch:ConvertibleDebtCarryingValueAdjustments
us-gaap:DebtInstrument
amch:DebtFeesPaidToThirdParties
us-gaap:DebtInstrument
amch:DebtInstrumentExchangeOfDebtPercentage
us-gaap:DebtInstrument
amch:DebtInstrumentExchangePricePercentageOfPrincipalAmountExchanged
us-gaap:DebtInstrument
amch:DebtInstrumentExchangePriceReductionOfPrincipalAmountExchanged
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:SubsequentEventType
amch:DebtInstrumentInterestRatePaymentInCash
us-gaap:CreditFacility
amch:DebtInstrumentPaidInKindInterestRatePercentage

amch:DecreaseInAccumulatedEarningsDueToDerivativeAssetValuationAllowanceAdjustment
us-gaap:StatementEquityComponents

amch:DeferredFinanceLeaseLiabilityChanges

amch:DeferredVariableLeaseLiabilityChanges

amch:DerivativeAssetFairValueAdjustment
us-gaap:IncomeStatementLocation, us-gaap:OptionIndexedToIssuersEquityType
us-gaap:DebtInstrument, us-gaap:IncomeStatementLocation
amch:DerivativeAssetValuationImmaterialCorrectionExpense
us-gaap:DebtInstrument
amch:DerivativeGainLossOnDerivativeNotEliminatedFromEarningsPerShareCalculation

amch:DerivativeLiabilityFairValueAdjustment
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

amch:DisposalGroupIncludingDiscontinuedOperationTransactionCost
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
amch:DisposalGroupNoncontrollingInterestOwnershipPercentageByNoncontrollingOwners
us-gaap:StatementScenario
amch:EquityInEarningsLossNonConsolidatedEntitiesExcludingInternationalTheatreJointVentures
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
amch:EquityMethodInvestmentDistributionReductionBelowRecordedInvestment

amch:EstimatedCreditIncomeLossesContingentLeaseGuarantees
us-gaap:IncomeStatementLocation
us-gaap:IncomeStatementLocation, us-gaap:OptionIndexedToIssuersEquityType

amch:ExhibitorServiceAgreement

amch:GainLossFromLiquidationOfSubsidiary
us-gaap:StatementEquityComponents

amch:GovernmentalAssistanceDueToInfrequentItems

amch:GovernmentalAssistanceDueToInfrequentItemsInInternationalMarkets
us-gaap:FairValueByMeasurementFrequency
amch:ImpairmentLossesOfLongLivedAssetsFairValueDisclosures
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
amch:IncomeLossFromEquityMethodInvestmentsInternationalTheatreJointVentures
us-gaap:ConsolidationItems, us-gaap:StatementScenario, us-gaap:StatementBusinessSegments
us-gaap:IncomeStatementLocation
amch:IncreaseDecreaseInExpenseDueToFinancingFees

amch:InterestExpenseNotEliminatedFromNetLossBecauseEffectWouldBeAntidilutive

amch:InterestPaidOnExchangeOffers

amch:InternationalGovernmentAssistanceDueToInfrequentItems

amch:LandlordContributions

amch:MergerAcquisitionTransactionCosts

amch:MiscellaneousExpense

amch:NetPeriodicBenefitCostCredit

amch:NoncashInvestmentValueOfAssetsAcquired

amch:NoncontrollingInterestIncludedIncreaseFromSubsidiaryEquityIssuance

amch:NonoperatingIncomeExpenseIncludingIncomeLossFromEquityMethodInvestments
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
amch:OperatingExpensesIncomeRelatedParty

amch:OperatingLeaseCommitmentsNotYetCommenced

amch:OperatingLeaseLandlordContributions

amch:OperatingLeaseNonCashExpensesBenefits

amch:OperatingLeaseNonCashPayments

amch:OtherNonoperatingIncomeExpenseExcludingMergerCosts
us-gaap:StatementScenario
us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType
amch:OtherOperatingLeaseCost
us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType
amch:OtherVariableLeaseCost
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
amch:PercentOfPerformanceTarget
us-gaap:CreditFacility
amch:PercentageOfDifferenceBetweenPresentValueOfOldAndNewCashFlows
us-gaap:DebtInstrument
us-gaap:DebtInstrument
amch:PercentageOfOutstandingExistingSubordinatedNotesValidlyTendered
us-gaap:CreditFacility, us-gaap:StatementClassOfStock
amch:PercentageOfOutstandingSharesOfEntity
us-gaap:Range, us-gaap:AwardType, us-gaap:GranteeStatus
amch:PercentageOfPerformanceStockUnitAwardVestingAsPercentageOfPerformanceTarget
us-gaap:Range, us-gaap:AwardType, us-gaap:GranteeStatus
amch:PercentageOfPerformanceTargetForGrantOfPerformanceStockUnitAward
us-gaap:Range, us-gaap:UnusualOrInfrequentItem
amch:PercentageOfSalaryReduction
us-gaap:StatementGeographical
amch:PercentageOfTheatresReopened
us-gaap:CreditFacility, us-gaap:StatementClassOfStock
amch:ReclassificationOfCommitmentFeeAndDeferredCharges
us-gaap:DebtInstrument
amch:ReclassificationOfDerivativeLiabilityToAdditionalPaidInCapital
dei:LegalEntity
amch:RelatedPartyReimbursements
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:IncomeStatementLocation, us-gaap:RelatedPartyTransactionsByRelatedParty
amch:RelatedPartyTransactionExpensesFromTransactions
us-gaap:AwardType
amch:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingLevelInPeriodCovid19Percent
us-gaap:AwardType
amch:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateIncrementalFairValue

amch:ShareBasedCompensationCashPortion
us-gaap:CounterpartyName, us-gaap:StatementClassOfStock
amch:StockIssuedDuringPeriodSharesCommitmentShares
us-gaap:CounterpartyName, us-gaap:StatementClassOfStock
amch:StockIssuedDuringPeriodValueCommitmentShares
us-gaap:StatementBusinessSegments
amch:TangibleAssetImpairmentNumberOfScreens
us-gaap:StatementBusinessSegments
amch:TangibleAssetImpairmentNumberOfTheatres

amch:TheatreAttendancePercentageNeededToMaintainOperation
us-gaap:StatementGeographical, us-gaap:SubsequentEventType
amch:TheatreLeftToReopenPercentage

amch:TheatreScreensOperatedPercentageDeclineFromPreviousYear

amch:ThirdPartyCosts

amch:TotalDeferredLeaseAmountsChanges

amch:ValueOfSharesIssuedStockBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature
us-gaap:StatementEquityComponents

us-gaap:AmortizationOfDebtDiscountPremium
us-gaap:CreditFacility
us-gaap:DebtInstrument

us-gaap:AssetImpairmentCharges

us-gaap:ContractWithCustomerLiabilityRevenueRecognized
us-gaap:ProductOrService
us-gaap:CounterpartyName, us-gaap:CreditFacility
us-gaap:ConversionOfStockSharesIssued1
us-gaap:DebtInstrument
us-gaap:DebtConversionConvertedInstrumentAmount1
us-gaap:DebtInstrument, us-gaap:StatementClassOfStock
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DebtInstrument, us-gaap:StatementClassOfStock
us-gaap:DebtConversionConvertedInstrumentSharesIssued1
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:CounterpartyName, us-gaap:CreditFacility
us-gaap:DebtConversionOriginalDebtAmount1
us-gaap:CounterpartyName, us-gaap:CreditFacility, us-gaap:StatementClassOfStock
us-gaap:DebtInstrument
us-gaap:DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal
us-gaap:DebtInstrument
us-gaap:DebtInstrumentIncreaseDecreaseForPeriodNet
us-gaap:DebtInstrument, us-gaap:StatementClassOfStock
us-gaap:DebtInstrumentPeriodicPaymentInterest
us-gaap:CreditFacility
us-gaap:DebtInstrumentRedemptionPricePercentage
us-gaap:CreditFacility, us-gaap:DebtInstrumentRedemptionPeriod
us-gaap:Range, us-gaap:CreditFacility
us-gaap:StatementScenario, us-gaap:CreditFacility
us-gaap:CreditFacility
us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
us-gaap:CreditFacility, us-gaap:DebtInstrumentRedemptionPeriod
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DebtInstrumentRedemptionPeriod
us-gaap:StatementScenario, us-gaap:CreditFacility

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EquityMethodInvestmentDividendsOrDistributions

us-gaap:EquityMethodInvestmentOtherThanTemporaryImpairment
us-gaap:IncomeStatementLocation
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:DebtInstrument
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPeriodIncreaseDecrease

us-gaap:FinanceLeaseInterestExpense
us-gaap:IncomeStatementLocation

us-gaap:FinanceLeaseInterestPaymentOnLiability

us-gaap:FinanceLeasePrincipalPayments
us-gaap:IncomeStatementLocation
us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:ForeignCurrencyTransactionGainLossRealized
us-gaap:IncomeStatementLocation

us-gaap:GainLossOnDispositionOfAssets

us-gaap:GainsLossesOnRestructuringOfDebt

us-gaap:GoodwillForeignCurrencyTranslationGainLoss
us-gaap:ReportingUnit

us-gaap:GoodwillImpairmentLoss
us-gaap:ReportingUnit
us-gaap:StatementGeographical

us-gaap:GoodwillWrittenOffRelatedToSaleOfBusinessUnit
us-gaap:ReportingUnit

us-gaap:ImpairmentOfIntangibleAssetsFinitelived
us-gaap:ReportingUnit

us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass, us-gaap:ReportingUnit

us-gaap:ImpairmentOfLongLivedAssetsHeldForUse
us-gaap:StatementBusinessSegments
us-gaap:StatementGeographical

us-gaap:IncomeLossFromEquityMethodInvestments
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:StatementScenario

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions

us-gaap:IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInReceivables

us-gaap:InterestPaid

us-gaap:InterestPaidCapitalized

us-gaap:InvestmentIncomeNet
us-gaap:StatementScenario

us-gaap:LeaseCost

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent
us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseExpense
us-gaap:FairValueByMeasurementFrequency
us-gaap:OperatingLeaseImpairmentLoss

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherCostAndExpenseOperating

us-gaap:OtherGeneralAndAdministrativeExpense

us-gaap:OtherNonoperatingExpense

us-gaap:PaidInKindInterest

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsOfFinancingCosts
us-gaap:CounterpartyName, us-gaap:DebtInstrument, us-gaap:SubsidiarySaleOfStock
us-gaap:DebtInstrument
us-gaap:StatementClassOfStock, us-gaap:TypeOfArrangement
us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType
us-gaap:PaymentsOfStockIssuanceCosts
us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:StatementClassOfStock, us-gaap:TypeOfArrangement

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireAssetsInvestingActivities
us-gaap:CounterpartyName, us-gaap:DebtInstrument, us-gaap:SubsidiarySaleOfStock
us-gaap:ProceedsFromIssuanceOfCommonStock
us-gaap:StatementClassOfStock
us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType
us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:StatementClassOfStock, us-gaap:TypeOfArrangement
us-gaap:TypeOfArrangement
us-gaap:BusinessAcquisition
us-gaap:ProceedsFromIssuanceOfDebt
us-gaap:DebtInstrument
us-gaap:ProceedsFromIssuanceOfMediumTermNotes

us-gaap:ProceedsFromMinorityShareholders

us-gaap:ProceedsFromPaymentsToMinorityShareholders

us-gaap:ProceedsFromRepaymentsOfLinesOfCredit

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
us-gaap:IncomeStatementLocation, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:RepaymentsOfLinesOfCredit

us-gaap:RepaymentsOfSecuredDebt
us-gaap:IncomeStatementLocation, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RevenueFromRelatedParties

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:CounterpartyName, us-gaap:DebtInstrument, us-gaap:StatementClassOfStock, us-gaap:SubsidiarySaleOfStock
us-gaap:StockIssuedDuringPeriodSharesNewIssues
us-gaap:CounterpartyName, us-gaap:StatementClassOfStock
us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType
us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:StatementClassOfStock, us-gaap:TypeOfArrangement
us-gaap:TypeOfArrangement
dei:LegalEntity, us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationForfeited

us-gaap:StockIssuedDuringPeriodValueAcquisitions
us-gaap:StatementClassOfStock
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueOther

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross
us-gaap:StatementEquityComponents

us-gaap:UndistributedEarningsLossAvailableToCommonShareholdersDiluted
us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:VariableLeaseCost

amch:AccountsPayableForContractualAmountDue

amch:AccountsPayablesContractualRentPaymentsDueAndNotPaid
us-gaap:LeaseContractualTerm

amch:AccountsPayablesContractualRentPaymentsDueAndNotPaidDeferredFinanceLease

amch:AccountsPayablesContractualRentPaymentsDueAndNotPaidDeferredVariableLease

amch:AccruedCasualtyClaimsAndPremiumsCurrent

amch:AccruedCasualtyClaimsAndPremiumsNoncurrent

amch:AccruedPayrollAndVacationCurrent

amch:ContingentLeaseLiabilities

amch:ContractsWithCustomersDeferredRevenue
amch:EquityMethodInvestmentActivityByClassification
us-gaap:DebtInstrument
amch:ConvertibleDebtCarryingValue

amch:CurrentMaturitiesOfOperatingLeaseLiabilitiesDeferredFinanceLease

amch:CurrentMaturitiesOfOperatingLeaseLiabilitiesDeferredOperatingLease

amch:CurrentMaturitiesOfOperatingLeaseLiabilitiesResolutionOfContingenciesDeferredOperatingLease

amch:DebtExchangeAmount
us-gaap:DebtInstrument, us-gaap:SubsequentEventType

amch:DebtInstrumentAccumulatedPaidInKindInterest
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument
amch:DebtInstrumentInterestRatePercentageInYearOne
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument
amch:DebtInstrumentInterestRatePercentageThereafter
us-gaap:DebtInstrument
amch:DebtInstrumentMaturitiesExtended
us-gaap:DebtInstrument
amch:DebtInstrumentMinimumLiquidityRequirements
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:CounterpartyName, us-gaap:CreditFacility, us-gaap:StatementClassOfStock
amch:DebtInstrumentPrincipalAmountForWhichPIKInterestHasBeenWaived
us-gaap:DebtInstrument, us-gaap:StatementClassOfStock
amch:DebtInstrumentVolumeWeightedAveragePrice

amch:DeferredFinanceLeaseLiability

amch:DeferredLeaseAmountsFinanceLeasePayments
us-gaap:LeaseContractualTerm

amch:DeferredLeaseAmountsOperatingLeasePayments
us-gaap:LeaseContractualTerm

amch:DeferredLeaseLiabilitiesIncludedInCurrentMaturitiesOfOperatingLeaseLiabilities

amch:DeferredLeaseLiabilitiesIncludedInLongTermOperatingLeaseLiabilities

amch:DeferredOperatingLeaseAmountFromDecreasesInDeferredBalances

amch:DeferredOperatingLeaseLiabilityFixed

amch:DeferredOperatingLeaseLiabilityFixedChanges

amch:DeferredTaxAssetsCapitalAndFinancingLeaseObligations

amch:DeferredTaxAssetsCorporateBorrowings

amch:DeferredTaxAssetsDisallowedInterest

amch:DeferredTaxAssetsLeaseLiabilities

amch:DeferredTaxAssetsReceivables

amch:DeferredTaxLiabilityRightOfUseAsset

amch:DeferredVariableLeaseLiability
us-gaap:RetirementPlanName
amch:DefinedBenefitPlanAggregatedAccumulatedBenefitObligation
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
amch:DisposalGroupIncludingDiscontinuedOperationConsiderationGross
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
amch:DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilityCurrent
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
amch:DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilityNonCurrent
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
amch:DisposalGroupIncludingDiscontinuedOperationOperatingLeaseRightOfUseAssetsNet
us-gaap:UnusualOrInfrequentItem
amch:DividendDecreaseCashSavings

amch:EquitySecuritiesFvNiNonCurrent

amch:EstimatedCancellationOfDebtIncome

amch:EstimatedCreditLossesContingentLeaseGuarantees
us-gaap:IncomeStatementLocation

amch:FilmExhibitionCostPayable

amch:FinanceLeaseRightOfUseAssetsAsResultOfLeaseRemeasurements

amch:GeneralLiabilitySelfInsuredAmountPerOccurrence

amch:GeneralLiabilitySelfInsuredDeductibleLimitPerOccurrence

amch:LongTermDebtAndFinanceLeaseObligations

amch:LongTermDebtAndFinanceLeaseObligationsNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel
amch:LongTermDebtCurrentFairValueDisclosure

amch:LongTermDeferredFinanceLeaseLiabilitiesOther

amch:LongTermOperatingLeaseLiabilitiesDeferredFinanceLease

amch:LongTermOperatingLeaseLiabilitiesDeferredOperatingLease

amch:LongTermOperatingLeaseLiabilitiesResolutionOfContingenciesDeferredOperatingLease

amch:MiscellaneousCurrentReceivables

amch:MiscellaneousDeferredIncome
us-gaap:Range
amch:NonRedemptionRateOnGiftCards

amch:OperatingLeaseRightOfUseAssetsAsResultOfLeaseRemeasurements
dei:LegalEntity
amch:OwnershipPercentageOfCombinedVotingPowerHeldInParentEntity
us-gaap:Range, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
amch:PercentageChangeInTotalAnnualAttendanceOfAllFoundingMembersRequiredToCauseEarlierCommonUnitAdjustment
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanName
amch:PercentageOfPlanAssetsValuationMethod
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanName

amch:PrepaidExpenseAndDeferredCostsNoncurrent
us-gaap:AwardType
amch:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodValue
us-gaap:AwardType, us-gaap:Vesting
amch:ShareBasedCompensationVolumeVolumeWeightedAverageExercisePrice

amch:TotalDeferredLeaseAmounts

amch:UnfavorableContractUnderEquityMethodInvestment
us-gaap:StatementClassOfStock
dei:EntityCommonStockSharesOutstanding

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

us-gaap:AccruedBonusesCurrent

us-gaap:AccruedRentCurrent

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentExcludingCapitalLeasedAssets
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:BankAcceptancesExecutedAndOutstanding

us-gaap:CapitalizedComputerSoftwareNet
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:CashIncludingDiscontinuedOperations
us-gaap:CreditFacility, us-gaap:StatementClassOfStock
us-gaap:CommonStockValueOutstanding

us-gaap:ConstructionPayableCurrentAndNoncurrent

us-gaap:ContractWithCustomerAssetNetCurrent

us-gaap:ContractWithCustomerLiability
us-gaap:ProductOrService
us-gaap:DebtInstrument
us-gaap:ConvertibleDebtNoncurrent

us-gaap:DebtInstrumentCarryingAmount
us-gaap:CreditFacility
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DebtInstrument
us-gaap:DebtInstrumentConvertibleConversionPrice1
us-gaap:DebtInstrument, us-gaap:StatementClassOfStock
dei:LegalEntity, us-gaap:CreditFacility
us-gaap:DebtInstrumentFaceAmount
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:CounterpartyName, us-gaap:DebtInstrument, us-gaap:StatementClassOfStock
us-gaap:CreditFacility
us-gaap:CreditFacility, us-gaap:SubsequentEventType
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:LongtermDebtType
us-gaap:CreditFacility
us-gaap:DebtInstrumentUnamortizedDiscount
us-gaap:DebtInstrument, us-gaap:StatementClassOfStock
us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:DebtInstrumentUnamortizedDiscountPremiumNet
us-gaap:CreditFacility
us-gaap:CreditFacility, us-gaap:LongtermDebtType
us-gaap:DebtInstrument

us-gaap:DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible

us-gaap:DeferredCompensationPlanAssets

us-gaap:DeferredFinanceCostsNet
us-gaap:DebtInstrument

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredRentCredit

us-gaap:DeferredRevenueLeasesNetNoncurrent

us-gaap:DeferredTaxAssetsCapitalLossCarryforwards

us-gaap:DeferredTaxAssetsDeferredIncome

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsInvestments

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesOtherComprehensiveIncome

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanFairValueOfPlanAssets
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation
us-gaap:StatementScenario, us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanByPlanAssetCategories
us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
us-gaap:RetirementPlanName
us-gaap:MeasurementInputType
us-gaap:DerivativeAssetMeasurementInput
us-gaap:StatementGeographical, us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass, us-gaap:MeasurementInputType
us-gaap:StatementGeographical, us-gaap:MeasurementInputType
us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationConsideration
us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationGoodwillNoncurrent
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent

us-gaap:DividendsPayableCurrentAndNoncurrent
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:DueFromRelatedParties
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:DueToRelatedPartiesCurrentAndNoncurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
dei:LegalEntity
us-gaap:EquityMethodInvestmentOwnershipPercentage
dei:LegalEntity, us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType
us-gaap:BusinessAcquisition
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:Range
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:CapitalUnitsByClass
us-gaap:StatementGeographical
us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentUnderlyingEquityInNetAssets

us-gaap:EquityMethodInvestments
amch:EquityMethodInvestmentActivityByClassification, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:EquityMethodInvestmentsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:FinanceLeaseLiability
us-gaap:CreditFacility

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueInRollingAfterYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueInRollingYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseRightOfUseAssetAccumulatedAmortization

us-gaap:FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:DebtInstrument
us-gaap:ForeignCurrencyExchangeRateTranslation1

us-gaap:IncomeTaxesReceivable
us-gaap:BusinessAcquisition
us-gaap:IndefiniteLivedTrademarks

us-gaap:InterestPayableCurrent
us-gaap:Range
us-gaap:InvestmentInterestRate
dei:LegalEntity, us-gaap:StatementClassOfStock
us-gaap:InvestmentOwnedBalanceShares
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:InvestmentsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
us-gaap:DebtInstrument
us-gaap:LineOfCredit
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:LongTermDebtFairValue

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
us-gaap:Ownership, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners
us-gaap:Ownership, us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:MoneyMarketFundsAtCarryingValue
us-gaap:FairValueByMeasurementFrequency
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:NotesReceivableRelatedParties

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards
us-gaap:IncomeTaxAuthority, us-gaap:TaxPeriod

us-gaap:OtherAssetsMiscellaneousCurrent

us-gaap:OtherAssetsMiscellaneousNoncurrent

us-gaap:OtherSundryLiabilitiesNoncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:PrepaidInsurance

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:PropertyPlantAndEquipmentFairValueDisclosure
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:RealEstateInvestmentPropertyNet

us-gaap:RestrictedCashAndCashEquivalents

us-gaap:RetailRelatedInventoryMerchandise

us-gaap:SelfInsuranceReserve
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:Vesting
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice
us-gaap:AwardType, us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
us-gaap:CounterpartyName, us-gaap:StatementClassOfStock
us-gaap:SharePrice
us-gaap:DebtInstrument
us-gaap:Range, us-gaap:AwardType

us-gaap:StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased

us-gaap:TreasuryStockCommonValue
us-gaap:IncomeTaxAuthority
us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

Plots across concepts


IncomeStatement
Income Loss From Continuing Operations 
Before Income Taxes Extraordinary Items Noncontrolling Interest
Expenses
Income Tax Expense Benefit
Balance Sheet
Stockholders Equity
Assets
Cash And Cash Equivalents At Carrying Value
Current Assets
Other Assets Current
NonCurrent Assets
Deferred Income Tax Assets Net
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Dividends Payable Current And Noncurrent
Current Liabilities
Long Term Debt Current
Noncurrent Liabilities
Minority Interest
Stockholders Equity
Retained Earnings Accumulated Deficit
CashFlow
Net Income Loss
NetCashProvidedByUsedInOperatingActivities
Net Income Loss
NetCashProvidedByUsedInInvestingActivities
Payments For Proceeds From Other Investing Activities
Shares
Weighted Average Number Of Diluted Shares Outstanding
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Remainder Of Fiscal Year

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassA█▇▃▂▁▁▁▁▁▁▁▁▁▁▁▁▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁5.14.51.80.60.50.50.50.50.50.50.50.50.50.50.50.50.60.60.3420.2150.2150.2150.2140.2140.2140.2140.2140.2140.2140.2140.214NANANA
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassBNANA0.50.50.50.50.50.50.50.50.50.50.80.80.80.80.80.80.7580.7580.7580.7580.7580.7580.7580.7580.7580.7580.7580.7580.758NANANA
 us-gaap:CommonStockSharesAuthorized us-gaap:Range,us-gaap:StatementClassOfStock,us-gaap:SubsequentEventType,us-gaap:TypeOfArrangement srt:Maximum,us-gaap:CommonClassA,us-gaap:SubsequentEvent,amch:EquityDistributionAgreementNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock,us-gaap:SubsequentEventType,us-gaap:TypeOfArrangement us-gaap:CommonClassA,us-gaap:SubsequentEvent,amch:EquityDistributionAgreementNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock,us-gaap:SubsequentEventType,us-gaap:TypeOfArrangement us-gaap:CommonClassA,us-gaap:SubsequentEvent,amch:EquityOfferingsAtMarketNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock,us-gaap:TypeOfArrangement us-gaap:CommonClassA,amch:EquityDistributionAgreement241.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▇▂▁▁▁▁▁▂▁▂▁▁▁▁▂▂▁480.731400.111152.307107.695104.319104.245103.85103.85135.528103.783135.45123.126128.105128.046129.265131.077131.166121.401NA98.28498.30498.207NA98.07398.03797.91997.8650.0976280.097628120.0973900978.0920.0760.076000030.07600003
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▇▂▁▁▁▁▁▁▁▁▁▁▁▁▂▂▁480.731400.111152.307107.695104.319104.245103.85103.85103.845103.783103.514123.126128.039128.046129.265131.077131.166121.358NA98.19498.19498.2NA97.97897.97897.91997.5060.0975060.097506680.0973900978.0920.0760.076000030.07600003
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:DebtInstrument amch:SeniorUnsecuredConvertibleNotesDue2024NA31.7NA34.031.7NANA31.7NA31.7NA5.9NANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareBasic ▇▇▅▅▅▁▇▇▇▇▇▇▇▇▆▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇█▇▇▇-0.71-1.42-6.21-8.41-5.38-20.88-0.13-0.530.48-1.251.65-0.820.170.14-2.14-0.33-1.350.070.28999999999999990.310.240.290.420.120.450.060.310.080.32-0.053.580.440.81-0.13
us-gaap:EarningsPerShareDiluted ▇▇▅▅▅▁▇▇▇▇▇▇▇▇▆▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇█▇▇▇-0.71-1.42-6.21-8.41-5.38-20.88-0.13-0.530.17-1.250.43-0.820.170.14-2.14-0.33-1.350.070.28999999999999990.310.240.290.420.120.450.060.30.080.32-0.053.580.440.81-0.13
us-gaap:IncomeLossFromContinuingOperationsPerBasicShare ▇▇▆▅▅▁▇▇▇▇▇▇▇▇▆▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇█▇▇▇-7.1e-07-1.42e-06-4.589999999999997e-06-8.41e-06-5.38e-06-2.088e-05-1.299999999999999e-07-5.3e-074.8e-07-1.25e-061.39e-06-8.2e-071.7000000000000001e-071.4e-07-2.1400000000000003e-06-3.3e-07-1.35e-067e-082.9e-073.1e-072.4e-072.9e-074.2e-071.2e-074.5000000000000003e-076e-083.1e-078e-083.2e-07-5.0000000000000004e-083.62e-064.5000000000000003e-078.100000000000001e-07-2.0000000000000002e-07
us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare ▇▇▆▅▅▁▇▇▇▇▇▇▇▇▆▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇█▇▇▇-7.1e-07-1.42e-06-4.589999999999997e-06-8.41e-06-5.38e-06-2.088e-05-1.299999999999999e-07-5.3e-071.7000000000000001e-07-1.25e-068.9e-07-8.2e-071.7000000000000001e-071.4e-07-2.1400000000000003e-06-3.3e-07-1.35e-067e-082.9e-073.1e-072.4e-072.9e-074.2e-071.2e-074.5000000000000003e-076e-083e-078e-083.2e-07-5.0000000000000004e-083.62e-064.5000000000000003e-078.100000000000001e-07-2.0000000000000002e-07
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
 COGS Ratio us-gaap:ProductOrService us-gaap:Admission▃▂▂▁▁▅█▇█▇█▇███▇233.069.580.362.90.9568.0877.0797.3895.5731.5862.3751.4896.3875.0897.1753.5NANANANANANANANANANANANANANANANANANA
 COGS Ratio us-gaap:ProductOrService us-gaap:FoodAndBeverage▃▂▂▁▁▅▇▇█▆▇▆▇▇▇▆161.550.144.829.10.4288.1438.3420.0492.5368.8435.1384.8445.8405.8415.3361.4NANANANANANANANANANANANANANANANANANA
 Cost Ratio us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName amch:DigitalCinemaImplementationPartnersLLCNANANA1.1NANANA40.1NANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
us-gaap:AllocatedShareBasedCompensationExpense █▁8.45.4NANA3.72.7NANANANANANANANANANANANANANANA1.0871.1032.1991.4395.7395.221-1.5961.3116.35712.00.00.00.0
us-gaap:ComprehensiveIncomeNetOfTax ▆▆▅▅▆▁▇▇▇▇█▇▇▇▆▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇█▇▇▇-323.1-617.9-855.3-894.2-505.2-2269.857.1-122.940.2-155.1150.0-107.9-85.028.2-256.6-9.0-100.06.524.35230.9124.64126.40943.27510.21642.803-2.47817.9265.93631.551-2.693297.03723.17764.95-6.004
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest █▁-0.4-0.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▇▆▅▅▆▁█▇-323.5-618.4-855.4-894.2-505.2-2269.857.1-122.9NANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService us-gaap:Admission▂▁▁▁▁▅▇▇█▆▇▆█▇▇▆98.922.024.226.60.2271.7434.5416.8482.5365.3433.5378.8471.4426.5440.1364.8NANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService us-gaap:FoodAndBeverage▃▂▃▁▁▆█▇█▇▇▇█▇▇▆26.39.722.18.84.553.473.667.276.461.568.963.672.266.269.560.7NANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses ▂▁▃▂▁█▄▃▄▃▃▃▃▃▃▃▃▃▂▂▂▂▂▁▂▁▁▁▁▁▂▁▂▁741.3576.11132.1794.9490.52927.61404.31296.01400.61234.11326.01243.31352.81273.71346.41183.01221.91228.0893.617714.247708.358706.766708.565653.301726.906621.071651.533605.39658.176605.219679.201638.137684.816558.26
 us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal us-gaap:DisposalGroupClassification,us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations,amch:ForumCinemasOuNA0.3-1.62.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:IncomeStatementLocation us-gaap:OtherExpenseNANA93.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▆▆▅▅▆▁▇▇█▇█▇███▇▇▇███████████▇███▇-349.2-574.0-952.9-901.2-567.3-2108.1-46.9-55.054.8-124.5171.0-89.319.622.414.1-60.3-286.1-0.812.38550.52140.35246.38164.93221.25867.27310.06841.58912.08651.504-7.9428.36837.30266.188-12.137
us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest ▇▆▅▅▆▁██-344.0-567.2-946.1-905.8-561.2-2176.3-13.5-54.8NANANANANANANANANANANANANANANANANANANANANA-4.842NANANA-15.237
 us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterest▁█-0.4-0.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:Parent█▁-343.6-566.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:RetainedEarnings█▁-343.6-566.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▄▄▄▄▄▅▄▄▄▄▄▅▄▄█▄▃▄▅▅▅▅▅▅▅▄▅▄▅▄▁▄▄▄-5.2-6.8-6.84.6-6.168.2-33.4-0.25.45.70.411.1-2.64.7290.5-17.6-109.6-9.219.220.08516.38518.0923.3159.0823.353.9311.774.7120.09-3.1-274.2433.434.333.1
 us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementScenario amch:AttributableEarningsBeforeInterestTaxesDepreciationAmortization▆▁█▄▄▃█▆▆0.1-0.20.20.00.0-0.10.20.10.1NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxesPaidNet ▂█▄▄▇▄▂▄▁▄█▄▅▅▄▅▆▄▃▃▅▄▆▃▂▃▃▃▄▄▄▃-2.99.00.90.97.01.7-1.82.1-4.52.59.61.53.94.51.33.15.51.00.1460.5023.2840.8066.3790.102-1.6350.505-0.8060.0150.5661.3091.149-0.339NANA
us-gaap:InterestExpense ▅█▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃▃▂▁▁▁98.9162.888.694.391.282.885.785.186.483.693.484.082.482.570.671.469.961.940.73726.727.027.1NANANANANANANANANANANANA
us-gaap:InterestExpenseDebt ▅█▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▂▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂88.1151.577.382.879.671.374.173.274.271.374.164.362.261.759.960.859.651.136.29724.67924.88824.86723.37922.68224.71726.07926.52826.89727.98929.65832.25932.22132.3133.173
us-gaap:NetIncomeLoss ▆▆▅▅▆▁▇▇█▇█▇██▇▇▇█████-343.6-566.9-945.8-905.8-561.2-2176.3-13.5-54.849.4-130.2170.6-100.422.217.7-276.4-42.7-176.58.429.030.424.028.3NANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterestNA-0.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:ParentNA-566.9NA-905.8-561.2-2176.3NA-54.849.4-130.2NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarningsNA-566.9NA-905.8-561.2-2176.3NA-54.849.4-130.2NA-100.422.217.7NA-42.7-176.58.4NANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▁█-0.4-0.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingExpenses ▄▆▁▆▅▆▇▇▆▆█▇▇▆█▆▆▇█▇▆▆-4.02.3-11.81.8-1.52.14.75.32.32.57.86.65.73.78.13.73.55.37.1175.83.83.4NANANANANANANANANANANANA
us-gaap:OperatingIncomeLoss ▇▆▄▅▆▁████████████████████████████-296.6-427.8-969.6-675.4-471.6-1986.143.420.8105.5-33.787.3-21.989.7109.970.4-4.3-19.655.432.47965.52455.60459.25175.29235.53994.17332.05360.62228.51468.39717.53933.77657.84777.84919.542
us-gaap:OtherNonoperatingIncomeExpense ▅▄▇▁▄▃▄▄▅▃█▃▄▄▄▄▄▄▄▄▄42.717.4116.4-125.06.6-26.9-8.31.323.4-29.8165.6-54.1-2.2-1.2-0.60.6-1.02.70.441-0.0790.11NA-1.4110.0-9.273NA-0.0530.011NANANANANANA
us-gaap:ProfitLoss ▆▆▅▅▆▁▇▇█▇█▇██▇▇▇█-344.0-567.2-946.1-905.8-561.2-2176.3-13.5-54.849.4-130.2170.6-100.422.217.7-276.4-42.7-176.58.4NANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName amch:DigitalCinemaImplementationPartnersLLCNANANA-30.6NANANA22.3NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▃▂▂▁▁▅█▇█▇█▇▇▇█▆▇▇▅▅▅▅▅▄▅▄▄▄▄▄▄▄▅▄444.7148.3162.5119.518.9941.51447.71316.81506.11200.41413.31221.41383.61383.61416.81178.71202.31281.4926.096779.771763.962766.017783.857688.84821.079653.124712.155633.904726.573622.758712.977695.984762.665577.802
us-gaap:Revenues ▃▂▂▁▁▅█▇█▇█▇█▇█▆▇▇▅▅▅▅▅▄▅▄▄▄▄▄▄▄▅▄444.7148.3162.5119.518.9941.51447.71316.81506.11200.41413.31221.41442.51383.61416.81178.71202.31283.4926.096779.771763.962766.017783.857688.84821.079653.124712.155633.904726.573622.758712.977695.984762.665577.802
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
us-gaap:Assets ▆▆▅▆▆▆████▅▅▅▅▅▅▅▅▄▁▁▁▁▁▁▁▁▁▁▁▁11329.110488.710276.410876.211271.611238.313675.813281.313514.913473.29495.89363.09531.89685.79805.99910.79811.79940.08641.8414969.2564948.5414931.0715110.0854667.164739.3254662.7554763.7324612.9154709.6964813.0285046.724NANANA
us-gaap:Liabilities █████▇▇▇▇▇▄▄▄▄▄▄▄▄▃▁▁▁▁▁▁▁▁▁▁▁▁12733.812775.713134.613211.612847.012312.312461.612098.012189.812169.78097.88108.17561.57600.47692.77485.57334.27338.36631.1073402.4753394.6153383.7373570.0183151.8623216.9093164.9473249.5743102.3363183.7983300.4253537.785NANANA
us-gaap:LiabilitiesAndStockholdersEquity ▆▆▅▆▆▆████▅▅▅▅▅▅▅▅▄▁▁▁▁▁▁▁▁▁▁▁▁11329.110488.710276.410876.211271.611238.313675.813281.313514.913473.29495.89363.09531.89685.79805.99910.79811.79940.08641.8414969.2564948.5414931.0715110.0854667.164739.3254662.7554763.7324612.9154709.6964813.0285046.724NANANA
us-gaap:StockholdersEquity ▃▂▁▂▃▃▆▆▆▆▆▆▇▇▇███▇▇▇▇▇▇▇▇▇▇▇▇▇-1404.7-2309.4-2885.1-2370.1-1575.4-1074.01214.21183.31325.11303.51397.61254.51969.92084.82112.42424.42476.72600.62009.6541565.7011552.8461546.2541538.7031513.9341521.0521496.3821512.7321509.1531524.4291511.1341507.47NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AccumulatedDefinedBenefitPlansAdjustment▂▂▁▂▂▂▂▄▄▄▄▃▃▃▄▄▄▄▄▄▄▄▄▄▄▄▆█-17.6-17.9-21.4-16.4-16.6-17.2-17.3-1.6-1.7-1.7-1.8-7.4-7.5-7.2-6.6-4.1-4.1-3.5-3.569-3.276-3.281-3.285-3.289-4.597-3.493-3.4995.56419.573NANA20.967NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome▄▄▅▃▃▁▄▂▃▄▄▅▅██▇▆▄▄▄▄▄▄▄▄▄▅▅8.2-12.338.7-52.0-63.6-119.6-26.1-96.7-28.6-19.45.526.033.5140.5125.6105.872.1-4.4-2.5512.071.5960.9222.8041.1463.1084.22812.84424.737NANA24.204NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AccumulatedTranslationAdjustment▅▄▆▃▃▁▄▁▃▃▄▅▅██▇▆▄▄▄▄▄▄▄▄▄▄▄25.85.660.1-35.6-47.0-102.4-8.8-95.1-26.9-17.77.233.339.0145.6129.9107.573.1-4.0-1.782.8672.7072.032.1011.6081.011.7050.6270.306NANA-0.351NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
us-gaap:AssetsCurrent █▄▂▃▃▂▃▂▃▂▃▃▃▃▄▃▃▄▃▁▁▁▂▂▂▂▂▂▂▃▃2012.31016.0487.0608.6679.7551.8673.1448.7590.0551.6781.3686.5840.9738.1872.4622.0622.3891.0683.643195.627255.472286.673414.367347.991462.551387.853509.739369.288474.918601.486843.523NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue █▄▂▂▃▂▂▁▂▂▂▂▂▂▂▂▁▂▂▁▁▁▂▁▂▁▂▁▂▂▃▁▁▁1811.2813.1308.3417.9498.0299.8265.0100.4190.5184.6313.3333.3316.4300.9310.0260.0127.8313.1207.07346.31293.316107.927211.2597.939179.34144.804218.206155.506235.305353.277546.454130.628136.307106.376
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents █▄▂▂▃▂▂▁▁▁▂▂▂▂▂▂▁▂▁1839.6842.1321.4428.8508.4309.8275.5110.6201.2195.2324.0344.3327.4312.5318.3291.4159.9336.4230.2NANANA211.2NANANANANANANANANANANA
us-gaap:ReceivablesNetCurrent ▂▂▂▃▂▄▇▅▇▆█▄▅▅█▄▄▄▆▁▂▂▃▁▂▁▃▁▂▁▃88.586.091.097.570.7126.8254.2157.9228.5193.8259.5155.2179.1167.1271.5128.9153.8144.8213.66757.74167.23185.048105.50956.79481.84948.21199.25242.93863.5553.316106.148NANANA
us-gaap:OtherAssetsCurrent ▁▁▁▁▂▃▄▅▄▄▆▅▆▆▆▇▇▆█▂▂▂▂▁▂▁▁▁▁▁▁84.287.974.682.3100.6115.2143.4180.2160.3162.6197.8187.0203.9204.1202.6226.3223.7211.7262.90391.57494.92593.69897.60884.493.29186.76784.34380.73582.65883.06680.824NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
us-gaap:NoncurrentAssets ▅▅▅▆▆▆████▄▄▄▅▅▅▅▅▄▄▄▄▁9316.89472.79789.410267.610591.910686.513002.712832.612924.912921.68714.58676.58690.98947.68933.59288.79189.49049.07958.1987958.27958.27958.24695.718NANANA4253.993NANANA4203.201NANANA
 us-gaap:AssetsNoncurrent us-gaap:EquityMethodInvestmentNonconsolidatedInvestee us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesNANA347.4NANANA843.3NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PropertyPlantAndEquipmentGross NANA4492.4NANANA4388.3NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType amch:FurnitureFixturesAndEquipmentNANA2343.7NANANA2216.8NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:BuildingAndBuildingImprovementsNANA222.3NANANA230.4NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LandNANA92.6NANANA106.3NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LeaseholdImprovementsNANA1833.8NANANA1834.8NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment █▅▁2417.72330.02232.1NANANA1812.5NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PropertyPlantAndEquipmentNet NANA2260.32332.52417.52520.42649.22581.42613.92600.83039.63028.63028.13091.33116.53244.53254.03162.23035.8591537.9511447.9971409.6341401.9281313.5261278.2161266.861247.231214.0361207.6081192.0341179.754NANANA
us-gaap:Goodwill ▁▂▂▃▃▃█▇██████████▅▁▁▁▁▁▁▁▁▁▁▁▁2472.12491.02547.32874.42988.42938.04789.14693.84763.04787.94788.74820.84830.74944.24931.74889.54832.24823.73932.962410.7132410.7132410.582406.6912289.82289.82289.82289.82289.82289.82289.82289.8NANANA
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill NANA152.5NANANA165.6NANANA166.5NANANA169.4NANANA155.259NANANA112.6NANANA104.4NANANA104.4NANANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel3,us-gaap:FairValueMeasurementsNonrecurringNANA44.043.850.350.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:FairValueByMeasurementBasis,us-gaap:FairValueByMeasurementFrequency us-gaap:CarryingReportedAmountFairValueDisclosure,us-gaap:FairValueMeasurementsNonrecurringNANA44.043.850.350.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueMeasurementsNonrecurringNANA2.34.68.38.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▁▁▁▁▂▂▂▂▂▂▇▇▇████▇▇▃▃▃▃▃▃▃▃▃▃▃▃156.8158.3163.2164.5174.3175.1195.3193.9197.6199.0352.1359.3365.3378.0380.5387.8389.4362.6365.142231.179233.329235.508237.376219.017221.112223.314225.515227.716229.917232.118234.319NANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueMeasurementsNonrecurringNANANA6.48.08.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredTaxAssetsLiabilitiesNet NANA40.2NANANA24.119.120.614.813.014.816.120.320.7174.8NANA69.483NANANA126.198NANANA181.782NANANA206.921NANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▂▃▃▄▅████4308.14348.74451.54475.84555.34602.34796.04794.94798.94809.2NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▁▁▂▄▅▅▆▇▆▆▆▅▅▆▆▇▆█▇▆▆▆▆▅▅▄▄▄▄▄▄261.2273.1304.6419.8455.8450.2503.0537.9520.4493.7505.5438.3438.6505.9475.9544.7509.1595.1533.792518.229508.371483.067523.525433.873436.201419.1417.604415.251410.629400.766402.504NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueMeasurementsRecurring█▂▁▁12.110.710.610.5NANA11.9NANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
us-gaap:AccountsPayableCurrent ▂▃▃▅▆▄█▄▅▅▆▅▇▆█▆▆▇▇▂▃▂▃▂▃▂▂▁▂▂▃235.2264.9298.8376.9436.1337.1543.3361.6423.2382.8452.6395.1535.8454.2569.6469.1477.8510.4501.761261.447298.456240.807313.025212.195268.891210.326262.635181.727258.69223.984268.163NANANA
us-gaap:LiabilitiesCurrent ▆▆▆▆▇▆█▇▇▇▅▄▅▅▅▄▄▅▄▁▂▁▂▁▂▁▂▁▁▁▂1558.41584.51578.51588.21711.21612.11933.21647.21713.91692.81328.11158.41243.41222.21409.41180.21146.61238.81189.19595.157620.362583.907712.154558.273616.916554.06636.377503.327583.09553.808657.996NANANA
us-gaap:LongTermDebtCurrent ▆▆▆▆▆▆▆██▁▁20.020.020.020.020.020.020.021.421.415.215.2NANANA15.2NANANA15.195NANANA10.195NANANA15.873NANANANANANANA
us-gaap:OperatingLeaseLiabilityCurrent █▇▆▁▆▆▇▅▅▅604.8591.1583.6511.0581.5581.5585.8568.1570.8570.7NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent ▅▅▄▅▄▅▆▇▆▇██▆▇▇▇▅▆▆▂▁▁▂▂▂▁▁▁▁▁▂286.7291.7257.8268.9257.5263.0324.6338.6317.8342.4378.5387.1312.2348.5351.1337.4289.8330.7328.949151.573131.877141.037158.664160.337153.604136.459136.262148.391141.509135.742170.92NANANA
us-gaap:OtherLiabilitiesCurrent NANA87.1NANANA114.1NANANA157.3NANANA146.6NANANA118.941NANANA23.129NANANA14.853NANANA19.831NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
 us-gaap:LiabilitiesNoncurrent us-gaap:EquityMethodInvestmentNonconsolidatedInvestee us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesNANA213.5NANANA260.5NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebt 5214.5NA5411.65448.3NANA4910.8NANANA4867.7NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtNoncurrent ▇▇██▇▇▆▆▆▆▆▆▅▅▅▅▅▅▄▁▁▁▁▁▁▁▁▁▁▁▂5480.45439.45695.85803.85498.05020.84733.44710.14713.14737.74707.84840.34202.64244.14220.14277.44249.14180.03745.7551843.3391824.7751851.161924.3661746.9961748.921771.6281775.1321780.271783.7361932.132069.672NANANA
us-gaap:DeferredFinanceCostsNoncurrentNet NANA8.3NANANA11.3NANANA6.7NANANA9.5NANANA7.707NANANA31.453NANANA13.129NANANA7.841NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▃▄▅▆▆▇▇██▇▆▆▆▇█▇▇▂▁28.534.040.543.443.247.746.049.851.745.841.644.344.348.549.647.446.926.620.962NANANANANANANANANANANANANANANA
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent NANA64.3NANANA59.9NANANA54.6NANANA62.7NANANA44.456NANANA42.196NANANA48.436NANANA30.177NANANA
us-gaap:MinorityInterest NA22.426.934.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:MinorityInterest us-gaap:DisposalGroupClassification,us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations,amch:ForumCinemasOuNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:MinorityInterest us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations amch:ForumCinemasOuNA22.4NA34.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:MinorityInterest us-gaap:StatementGeographical,us-gaap:DisposalGroupClassification,us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations amch:LithuaniaAndEstonia,us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations,amch:ForumCinemasOuNANA26.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▁▁▁▁▁▁▁▁▁▁████▇▇▆▆▆▄▄▄▃▃▃▃▃▃▃▃▃188.6207.1241.3240.6220.0212.0195.9190.0192.0188.2963.1980.7963.0937.5903.8847.7746.6726.5706.562513.857492.393484.668462.626438.944437.402419.61419.717394.584387.049378.837370.946NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▆▆█▆▁▂▇▅▅▄4888.64908.94957.84909.44744.44784.34913.84857.64852.04826.6NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo ▅▁█▃941.5895.9971.8922.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree ▃▁█▅816.7792.0862.6830.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour ▅▁█▃770.9756.5785.2763.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive ▃▁█▅704.6691.1752.9728.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive ▂▁█▆3768.13719.84371.14228.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
us-gaap:StockholdersEquity ▃▂▁▂▃▃▆▆▆▆▆▆▇▇▇███▇▇▇▇▇▇▇▇▇▇▇▇▇-1404.7-2309.4-2885.1-2370.1-1575.4-1074.01214.21183.31325.11303.51397.61254.51969.92084.82112.42424.42476.72600.62009.6541565.7011552.8461546.2541538.7031513.9341521.0521496.3821512.7321509.1531524.4291511.1341507.47NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AccumulatedDefinedBenefitPlansAdjustment▂▂▁▂▂▂▂▄▄▄▄▃▃▃▄▄▄▄▄▄▄▄▄▄▄▄▆█-17.6-17.9-21.4-16.4-16.6-17.2-17.3-1.6-1.7-1.7-1.8-7.4-7.5-7.2-6.6-4.1-4.1-3.5-3.569-3.276-3.281-3.285-3.289-4.597-3.493-3.4995.56419.573NANA20.967NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome▄▄▅▃▃▁▄▂▃▄▄▅▅██▇▆▄▄▄▄▄▄▄▄▄▅▅8.2-12.338.7-52.0-63.6-119.6-26.1-96.7-28.6-19.45.526.033.5140.5125.6105.872.1-4.4-2.5512.071.5960.9222.8041.1463.1084.22812.84424.737NANA24.204NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AccumulatedTranslationAdjustment▅▄▆▃▃▁▄▁▃▃▄▅▅██▇▆▄▄▄▄▄▄▄▄▄▄▄25.85.660.1-35.6-47.0-102.4-8.8-95.1-26.9-17.77.233.339.0145.6129.9107.573.1-4.0-1.782.8672.7072.032.1011.6081.011.7050.6270.306NANA-0.351NANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest ▃▂▁▂▃▄█-1404.7-2287.0-2858.2-2335.4-1575.4-1074.01214.2NANANA1397.6NANANA2112.4NANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:EquityMethodInvestmentNonconsolidatedInvestee us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesNANA220.5NANANA699.7NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementClassOfStock us-gaap:CommonClassANANANA0.60.50.50.5NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementClassOfStock,us-gaap:StatementEquityComponents us-gaap:CommonClassA,us-gaap:CommonStock█▇▁5.14.51.8NA0.50.50.50.50.50.50.5NANANA0.5NANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementClassOfStock,us-gaap:StatementEquityComponents us-gaap:CommonClassB,us-gaap:CommonStockNANA0.50.50.50.50.50.50.50.50.5NANANA0.8NANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome▇▆█▄▃▁▅▂▅▅▇8.2-12.338.7-52.0-63.6-119.6-26.1-96.7-28.6-19.45.5NANANA125.6NANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital█▅▂▁▁▁▁▁▁▁▁4847.43657.12465.62125.02007.32003.62001.92008.92006.82001.71998.4NANANA2241.6NANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterestNA22.426.934.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:Parent▃▂▁▂▃▄█████-1404.7-2309.4-2885.1-2370.1-1575.4-1074.01214.21183.31325.11303.51397.6NANANA2112.4NANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁▁▂▃▄▅█████-6265.4-5902.3-5335.3-4387.8-3463.7-2902.6-706.2-673.5-597.7-623.4-550.9NANANA-207.9NANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:TreasuryStockCommonNA-56.4-56.4-56.4-56.4-56.4-56.4-56.4-56.4-56.4-56.4NANANA-48.2NANANANANANANANANANANANANANANANANANANA
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassA█▇▃▂▁▁▁▁▁▁▁▁▁▁▁▁▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁5.14.51.80.60.50.50.50.50.50.50.50.50.50.50.50.50.60.60.3420.2150.2150.2150.2140.2140.2140.2140.2140.2140.2140.2140.214NANANA
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassBNANA0.50.50.50.50.50.50.50.50.50.50.80.80.80.80.80.80.7580.7580.7580.7580.7580.7580.7580.7580.7580.7580.7580.7580.758NANANA
us-gaap:AdditionalPaidInCapitalCommonStock █▆▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▁▁▁▁▁▁▁▁▁▁▁▁4847.43657.12465.62125.02007.32003.62001.92008.92006.82001.71998.41994.52247.02242.92241.62240.02240.32237.81627.3841187.2441185.5391184.1211183.2181182.071179.7821178.281172.5151167.2851168.8291167.5091161.152NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▁▁▂▃▄▅▇▇▇▇▇▇▇▇▇████████████████-6265.4-5902.3-5335.3-4387.8-3463.7-2902.6-706.2-673.5-597.7-623.4-550.9-710.6-255.5-251.7-207.994.5163.6366.5384.401376.094365.418360.918352.389330.426337.87313.582327.081316.839329.039317.222321.73NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▄▄▅▃▃▁▄▂▃▄▄▅▅██▇▆▄▄▄▄▄▄▄▄▄▅▅▅▅▅▄▅▅8.2-12.338.7-52.0-63.6-119.6-26.1-96.7-28.6-19.45.526.033.5140.5125.6105.872.1-4.4-2.5512.071.5960.9222.8041.1463.1084.22812.84424.73726.17726.01924.2046.78417.07213.698
us-gaap:MinorityInterest NA22.426.934.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:MinorityInterest us-gaap:DisposalGroupClassification,us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations,amch:ForumCinemasOuNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:MinorityInterest us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations amch:ForumCinemasOuNA22.4NA34.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:MinorityInterest us-gaap:StatementGeographical,us-gaap:DisposalGroupClassification,us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations amch:LithuaniaAndEstonia,us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations,amch:ForumCinemasOuNANA26.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:StockIssuedDuringPeriodValueNewIssues █▁989.2581.6NA2.8NANANANANANANANANANA0.00.0-0.9617.5NANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▁▁▁▂▃█▅▆▄▇▄▆▆█▆▄▆▇▅▆▅▇▅▆▅▆▅▅▄▆▅▅▅-233.8-312.9-357.9-355.7-231.9-184.0368.856.6152.21.4224.41.7131.7165.4329.6119.3-62.7172.5220.477.352111.07722.871258.27516.31171.35221.563178.71212.342107.823-1.575152.67771.16197.62235.882
us-gaap:NetCashProvidedByUsedInInvestingActivities ███▇▇▇▇▇▇▇▆█▇▇▇█▇▃▁▇▇▇▆▇▇▇▇▇▇▇▇▇▇▇13.5-16.00.2-23.3-44.1-87.4-167.7-127.1-122.8-98.5-202.967.2-66.7-114.8-149.966.7-138.5-743.5-1106.3-120.302-76.373-51.625-292.314-72.826-72.882-71.378-88.2-68.772-56.488-58.231-88.506-71.878-70.099-38.301
us-gaap:NetCashProvidedByUsedInFinancingActivities █▆▃▃▄▃▂▂▂▂▂▂▂▂▁▂▂▅▇▂▂▁▃▂▂▂▂▂▁▁▄▂▂▂1212.2854.7247.8296.6473.5312.4-40.0-18.4-20.6-33.9-39.5-37.4-55.5-62.4-128.7-60.26.9674.31046.0-3.979-49.239-74.582147.385-24.603-63.837-23.645-27.799-23.378-169.325-133.362351.683-4.9622.435-24.228
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect █▅▁▂▃▂▃▂▂▁▂▂▂▂▂▃▁▃997.5520.7-107.4-79.6198.634.3164.9-90.66.0-128.8-20.316.914.9-5.826.9131.5-176.5106.2NANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
us-gaap:AmortizationOfFinancingCosts ▂█▁▁▂▂▂▂▂▂3.412.12.63.24.34.14.04.03.44.4NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredIncomeTaxExpenseBenefit ▄▄▄▄▄▅▄▄▄▄▄▄▄▄█▄▃▄▄▅▅▅▅▄▅▄▅▄▅▄▁▄▄▄-6.1-6.2-1.2-0.2-5.871.2-40.7-1.94.84.1-2.9-1.5-3.51.5295.7-19.6-109.5-8.8-11.54516.80112.616.23533.989-10.95325.0993.52512.7654.22518.33-2.89-275.0282.82.832.8
us-gaap:DepreciationDepletionAndAmortization ▅▆▇▆▆▆▆▆▆▆█▇▇▇█▇▇▇▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁105.7114.1132.6123.5119.7122.5112.9112.1112.0113.0139.4130.2137.7130.5144.7135.2133.3125.382.49763.02562.29160.4359.92758.00857.24957.77755.46754.32751.7554.77750.10248.60350.3748.462
us-gaap:IncreaseDecreaseInAccountsPayable ▃▄▃▃▆▁█▃▅▃▆▁▅▂▇▄▄▃▇▃▅▃▆▃▅▃▆▃▅▃▆▃▅▄-56.0-11.9-55.2-66.2114.8-169.8206.0-65.541.0-76.7105.4-149.065.1-107.1151.0-18.3-28.1-69.9138.44-70.08134.611-81.48111.206-75.59864.752-58.99877.573-68.51428.959-51.7188.905-62.82843.035-4.897
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▅▇▆▂▄▁▆▅▆▄▅▅▇▄▇▇▄▅▅▅▅▅▄▅▅▆▅▄█▄▅▃▇▆-2.211.95.6-19.3-6.0-23.54.31.07.7-5.51.51.08.1-4.58.113.4-4.8-0.4-1.21-0.526-1.419-1.059-4.294-0.402-0.4363.718-2.044-4.40816.534-8.0160.285-12.7419.7412.823
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▁▁▁▂▃█▅▆▄▇▄▆▆█▆▄▆▇▅▆▅▇▅▆▅▆▅▅▄▆▅▅▅-233.8-312.9-357.9-355.7-231.9-184.0368.856.6152.21.4224.41.7131.7165.4329.6119.3-62.7172.5220.477.352111.07722.871258.27516.31171.35221.563178.71212.342107.823-1.575152.67771.16197.62235.882
us-gaap:NetIncomeLoss ▆▆▅▅▆▁▇▇█▇█▇██▇▇▇█████-343.6-566.9-945.8-905.8-561.2-2176.3-13.5-54.849.4-130.2170.6-100.422.217.7-276.4-42.7-176.58.429.030.424.028.3NANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterestNA-0.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:ParentNA-566.9NA-905.8-561.2-2176.3NA-54.849.4-130.2NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarningsNA-566.9NA-905.8-561.2-2176.3NA-54.849.4-130.2NA-100.422.217.7NA-42.7-176.58.4NANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss ▆▆▅▅▆▁▇▇█▇█▇██▇▇▇█-344.0-567.2-946.1-905.8-561.2-2176.3-13.5-54.849.4-130.2170.6-100.422.217.7-276.4-42.7-176.58.4NANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName amch:DigitalCinemaImplementationPartnersLLCNANANA-30.6NANANA22.3NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ShareBasedCompensation ▆▅█▄▄▄▁▄▅▄▄▄▄▄▄▃▄▃▃▄▄▃▃▄▄▅▅▃▄▅8.45.415.93.13.72.7-7.12.15.44.04.04.14.02.81.8-0.13.90.10.3461.7051.7171.0871.1032.1991.4395.7395.221-1.5961.3116.357NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ███▇▇▇▇▇▇▇▆█▇▇▇█▇▃▁▇▇▇▆▇▇▇▇▇▇▇▇▇▇▇13.5-16.00.2-23.3-44.1-87.4-167.7-127.1-122.8-98.5-202.967.2-66.7-114.8-149.966.7-138.5-743.5-1106.3-120.302-76.373-51.625-292.314-72.826-72.882-71.378-88.2-68.772-56.488-58.231-88.506-71.878-70.099-38.301
us-gaap:PaymentsToAcquireProductiveAssets ▁▁▁▂▂▄▇▅▅▅█▆▆▅▆▆▆▇▇▅▄▃▅▃▃▃▄▃▃▃▄▃▃▂17.911.917.829.335.091.7169.9118.3115.1114.8201.4133.8133.8107.3159.1149.7156.7161.3165.114116.382.657.657117.84971.81774.16769.5987.76667.7659.60955.59985.46270.66665.34539.35
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities █▆▃▃▄▃▂▂▂▂▂▂▂▂▁▂▂▅▇▂▂▁▃▂▂▂▂▂▁▁▄▂▂▂1212.2854.7247.8296.6473.5312.4-40.0-18.4-20.6-33.9-39.5-37.4-55.5-62.4-128.7-60.26.9674.31046.0-3.979-49.239-74.582147.385-24.603-63.837-23.645-27.799-23.378-169.325-133.362351.683-4.9622.435-24.228
us-gaap:PaymentsOfDividends NANA2.20.00.04.320.720.820.821.820.7186.025.625.825.978.752.526.220.54619.63919.63919.80319.59619.71119.4819.82119.50119.514NANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:ConsolidatedEntities,us-gaap:DebtInstrument,us-gaap:SubsequentEventType amch:OdeonCinemasGroupLimited,amch:FourHundredMillionTermLoanFacility,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:CreditFacility amch:FirstLienNotesDue2025████▁1.05e-051.05e-051.05e-051.05e-051.05e-07NA1.05e-07NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:CreditFacility amch:OdeonRevolvingCreditFacilityDue2022Rate26NANA2.6e-06NA2.5999999999999998e-082.5999999999999998e-082.5999999999999998e-08NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:CreditFacility amch:OdeonRevolvingCreditFacilityDue2022Rate317NANA2.5785e-06NA3.17e-083.17e-083.17e-08NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:CreditFacility amch:SecondLienNotesDue2026NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:CreditFacility amch:SeniorSecuredCreditFacilityTermLoanDue2026▁▆█3.0855e-063.195e-063.23e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument amch:FirstLienNotesDue2026NANANA1.05e-05NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument amch:SeniorSubordinatedNotes5.75PercentDue2025▄▄▄5.75e-065.75e-065.75e-06NANA5.7500000000000005e-085.7500000000000005e-08NA5.7500000000000005e-085.7500000000000005e-085.7500000000000005e-085.7500000000000005e-08NANA5.7500000000000005e-085.8749999999999993e-085.8749999999999993e-08NA5.7500000000000005e-085.7500000000000005e-085.7500000000000005e-085.7500000000000005e-085.7500000000000005e-08NANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument amch:SeniorSubordinatedNotes5.875PercentDue2026▄▄▄5.875e-065.875e-065.875e-06NANA5.8749999999999993e-085.8749999999999993e-08NA5.8749999999999993e-085.8749999999999993e-085.8749999999999993e-085.8749999999999993e-08NANA5.8749999999999993e-085.8749999999999993e-085.8749999999999993e-085.8749999999999993e-085.8749999999999993e-08NANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument amch:SeniorSubordinatedNotes6.125PercentDue2027▄▄▄6.125e-066.125e-066.125e-06NANA6.125e-086.125e-08NA6.125e-086.125e-086.125e-086.125e-08NANA6.125e-086.125e-086.125e-086.125e-086.125e-08NANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument amch:SeniorSubordinatedNotes6.375PercentDue2024▄▄▄6.375e-066.375e-066.375e-06NANA6.375e-086.375e-08NA6.375e-086.375e-086.375e-086.375e-08NANA6.375e-086.375e-086.375e-08NA6.375e-08NANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument amch:SeniorSubordinatedNotesDue5.75Percent2025NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument amch:SeniorSubordinatedNotesDue5.875Percent2026NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument amch:SeniorSubordinatedNotesDue6.125Percent2027NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument amch:SeniorSubordinatedNotesDue6.375Percent2024NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument amch:SeniorUnsecuredConvertibleNotesDue2024NANA2.95e-062.95e-06NA2.95e-082.95e-08NA2.95e-082.95e-082.95e-082.95e-08NANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:SubsequentEventType amch:New10.500SeniorSecuredNotesDue2026,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:SubsequentEventType amch:SeniorSubordinatedNotesDue6.375Percent2024,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range,us-gaap:CreditFacility srt:Maximum,us-gaap:RevolvingCreditFacilityNANA2.74e-062.76e-062.87e-08NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range,us-gaap:CreditFacility srt:Minimum,us-gaap:RevolvingCreditFacilityNANA2.65e-062.65e-062.36e-08NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range,us-gaap:DebtInstrument srt:Maximum,amch:SecondLienSubordinatedSecuredNotesDue2026NANANA1.2e-05NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range,us-gaap:DebtInstrument srt:Minimum,amch:SecondLienSubordinatedSecuredNotesDue2026NANANA1e-05NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range,us-gaap:DebtInstrument,us-gaap:SubsequentEventType srt:Maximum,amch:SecondLienSubordinatedSecuredNotesDue2026,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range,us-gaap:DebtInstrument,us-gaap:SubsequentEventType srt:Minimum,amch:SecondLienSubordinatedSecuredNotesDue2026,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range,us-gaap:LongtermDebtType srt:Maximum,amch:DebtAgreementWithMudrickCapitalManagementLpNANA1.7e-05NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range,us-gaap:LongtermDebtType srt:Minimum,amch:DebtAgreementWithMudrickCapitalManagementLpNANA1.5e-05NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value5100000.04500000.01800000.0600000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0600000.0600000.0342000.0215000.0215000.0215000.0214000.0214000.0214000.0214000.0214000.0214000.0214000.0214000.0214000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonClassB


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0800000.0800000.0800000.0800000.0800000.0800000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0
Percentage of CommonStockValue27.883.3100.0100.0100.0100.0100.0100.0100.0100.0160.0160.0160.0160.0133.3133.3221.6352.6352.6352.6354.2354.2354.2354.2354.2354.2354.2354.2354.2
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassB0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized us-gaap:Range, us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:CommonStockSharesAuthorized

srt:Maximum, us-gaap:CommonClassA, us-gaap:SubsequentEvent, amch:EquityDistributionAgreement


Common
Period End2021-01-252020-10-20
Value5015
Percentage of CommonStockSharesAuthorized100.0100.0

us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:CommonClassA, us-gaap:SubsequentEvent, amch:EquityDistributionAgreement


Common
Period End2021-04-272020-10-20
Value4315
Percentage of CommonStockSharesAuthorized0.0100.0

us-gaap:CommonClassA, us-gaap:SubsequentEvent, amch:EquityOfferingsAtMarket


Common
Period End2021-04-27
Value43
Percentage of CommonStockSharesAuthorized0.0

us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock, us-gaap:TypeOfArrangement

us-gaap:CommonClassA, amch:EquityDistributionAgreement


Common
Period End2021-06-302021-01-252020-12-112020-11-102020-10-202020-09-24
Value24150178201515
Percentage of CommonStockSharesAuthorized0.0100.00.00.0100.00.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value480400152107104104103103135103135123128128129131131121989898989897970.0976280.097628120.09739009780.0760.076000030.07600003
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value480400152107104104103103103103103123128128129131131121989898979797970.0975060.097506680.09739009780.0760.076000030.07600003
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:DebtInstrument

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

amch:SeniorUnsecuredConvertibleNotesDue2024


Antidilutive
Period End2021-03-312020-09-302020-06-302019-09-302019-03-312018-09-30
Value31343131315.9
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.71-1.42-6.21-8.41-5.38-20.88-0.13-0.530.48-1.251.65-0.820.170.14-2.14-0.33-1.350.070.290.310.240.290.420.120.450.060.310.080.32-0.053.580.440.81-0.13
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.71-1.42-6.21-8.41-5.38-20.88-0.13-0.530.17-1.250.43-0.820.170.14-2.14-0.33-1.350.070.290.310.240.290.420.120.450.060.30.080.32-0.053.580.440.81-0.13
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Basic Share

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.71-1.42-4.59-8.41-5.38-20.88-0.13-0.530.48-1.251.39-0.820.170.14-2.14-0.33-1.350.070.290.310.240.290.420.120.450.060.310.080.32-0.053.620.450.81-0.2
Percentage of IncomeLossFromContinuingOperationsPerBasicShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Diluted Share

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.71-1.42-4.59-8.41-5.38-20.88-0.13-0.530.17-1.250.89-0.820.170.14-2.14-0.33-1.350.070.290.310.240.290.420.120.450.060.30.080.32-0.053.620.450.81-0.2
Percentage of IncomeLossFromContinuingOperationsPerDilutedShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-06-302021-03-312020-06-302020-03-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value8.45.43.72.71.0871.1032.1991.4395.7395.221-1.5961.3116.357120.00.00.0
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.93.619.60.30.10.10.30.20.90.7-0.30.21.01.70.00.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType

amch:PerformanceStockUnits


Allocated
Period End2021-06-30
Value3.4
Percentage of AllocatedShareBasedCompensationExpense40.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax amch:PerformanceStockUnits0.0

amch:SpecialPerformanceStockUnit


Allocated
Period End2021-06-302020-06-30
Value1.50.7
Percentage of AllocatedShareBasedCompensationExpense17.918.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.33.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax amch:SpecialPerformanceStockUnit0.00.0

us-gaap:RestrictedStockUnitsRSU


Allocated
Period End2021-06-302020-06-30
Value3.53.0
Percentage of AllocatedShareBasedCompensationExpense41.781.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.815.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RestrictedStockUnitsRSU0.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:IncomeStatementLocation

us-gaap:GeneralAndAdministrativeExpense


Allocated
Period End2021-03-312020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value5.42.7-7.12.15.44.04.04.24.02.81.8-0.13.90.12.2911.7051.7171.12.1991.439
Percentage of AllocatedShareBasedCompensationExpense100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0101.2100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.60.3-0.50.20.40.30.30.30.30.20.1-0.00.30.00.20.20.20.10.30.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:GeneralAndAdministrativeExpense0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Allocated
Period End2021-03-312020-03-31
Value5.42.7
Percentage of AllocatedShareBasedCompensationExpense100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.60.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AdditionalPaidInCapital0.00.0

us-gaap:Parent


Allocated
Period End2021-03-31
Value5.4
Percentage of AllocatedShareBasedCompensationExpense100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent0.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-323.1-617.9-855.3-894.2-505.2-2269.857-122.940-155.1150-107.9-85.028-256.6-9.0-100.06.524302426431042-2.478175.93631-2.6932972364-6.004
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-72.7-416.7-526.3-748.3-2673.0-241.13.9-9.32.7-12.910.6-8.8-6.12.0-18.1-0.8-8.30.52.64.03.23.45.51.55.2-0.42.50.94.3-0.441.73.38.5-1.0

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-31
Value-400000.0-500000.0
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.3

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-323500000.0-618400000.0-855400000.0-894200000.0-505200000.0-2269800000.057100000.0-122900000.0
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-72.7-417.0-526.4-748.3-2673.0-241.13.9-9.3

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService

us-gaap:CostOfGoodsAndServicesSold

us-gaap:Admission


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value982224260.2271434416482365433378471426440364
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.214.814.922.31.128.930.031.732.030.430.731.034.130.831.130.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Admission42.431.70.042.322.247.80.052.353.949.90.050.452.648.70.048.4

us-gaap:FoodAndBeverage


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value269.7228.84.55373677661686372666960
Percentage of CostOfGoodsAndServicesSold26.644.191.333.12250.019.716.916.115.816.815.916.815.315.515.816.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.96.513.67.423.85.75.15.15.15.14.95.25.24.84.95.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:FoodAndBeverage16.319.40.030.21125.018.50.016.015.516.70.016.516.216.30.016.8

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value74157611327944902927140412961400123413261243135212731346118312211228893714708706708653726621651605658605679638684558
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax166.7388.5696.7665.22595.2311.097.098.493.0102.893.8101.897.892.195.0100.4101.695.896.591.692.792.390.494.888.595.191.595.590.697.295.391.789.896.6

us-gaap:CostsAndExpenses us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

amch:DigitalCinemaImplementationPartnersLLC


Costs
Period End2020-09-302019-09-30
Value3117
Percentage of CostsAndExpenses4.01.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.51.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax amch:DigitalCinemaImplementationPartnersLLC0.00.0

Disposal Group Not Discontinued Operation Gain Loss On Disposal

us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, amch:ForumCinemasOu


Disposal
Period End2021-05-312021-03-312020-12-312020-09-30
Value5500000.0300000.0-1600000.02800000.0
Percentage of DisposalGroupNotDiscontinuedOperationGainLossOnDisposal100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.2-1.02.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations amch:ForumCinemasOu0.00.00.00.0

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:IncomeStatementLocation

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:OtherExpense


Gains
Period End2020-12-31
Value93
Percentage of GainsLossesOnExtinguishmentOfDebt100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax57.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OtherExpense0.0

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-349.2-574.0-952.9-901.2-567.3-2108.1-46.9-55.054-124.5171-89.3192214-60.3-286.1-0.81250404664216710411251-7.9428.3683766-12.137
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-78.5-387.1-586.4-754.1-3001.6-223.9-3.2-4.23.6-10.412.1-7.31.41.61.0-5.1-23.8-0.11.36.55.36.18.33.18.21.55.81.97.1-1.31.25.48.7-2.1

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302014-03-312013-03-31
Value-344.0-567.2-946.1-905.8-561.2-2176.3-13.5-54.8-4.842-15.237
Percentage of IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-77.4-382.5-582.2-758.0-2969.3-231.2-0.9-4.2-0.8-2.6

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Income
Period End2021-06-302021-03-31
Value-0.4-0.3
Percentage of IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest0.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.0

us-gaap:Parent


Income
Period End2021-06-302021-03-31
Value-343.6-566.9
Percentage of IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest99.999.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-77.3-382.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent0.00.0

us-gaap:RetainedEarnings


Income
Period End2021-06-302021-03-31
Value-343.6-566.9
Percentage of IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest99.999.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-77.3-382.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-5.2-6.8-6.84.6-6.168-33.4-0.25.45.70.411-2.64.7290-17.6-109.6-9.219201618239.08233.93114.7120-3.1-274.2433.434.333.1
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.2-4.6-4.23.8-32.37.2-2.3-0.00.40.50.00.9-0.20.320.5-1.5-9.1-0.72.12.62.12.43.01.32.80.61.70.72.8-0.5-38.50.50.60.5

us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementScenario

amch:AttributableEarningsBeforeInterestTaxesDepreciationAmortization


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.1-0.20.20.00.0-0.10.20.10.1
Percentage of IncomeTaxExpenseBenefit-1.92.9-2.90.0-0.0-0.1-0.6-50.01.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-0.10.10.00.0-0.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax amch:AttributableEarningsBeforeInterestTaxesDepreciationAmortization0.00.00.00.00.00.00.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-2.99.00.90.97.01.7-1.82.1-4.52.59.61.53.94.51.33.15.51.00.1460.5023.2840.8066.3790.102-1.6350.505-0.8060.0150.5661.3091.149-0.339
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.76.10.60.837.00.2-0.10.2-0.30.20.70.10.30.30.10.30.50.10.00.10.40.10.80.0-0.20.1-0.10.00.10.20.2-0.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value981628894918285858683938482827071696140262727
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.2109.854.578.9482.58.85.96.55.77.06.66.96.06.05.06.15.84.84.43.43.53.5

us-gaap:InterestExpense us-gaap:StatementScenario

amch:AttributableEarningsBeforeInterestTaxesDepreciationAmortization


Interest
Period End2021-06-302020-12-312020-09-302019-09-302019-06-30
Value0.20.00.10.00.1
Percentage of InterestExpense0.20.00.10.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.10.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax amch:AttributableEarningsBeforeInterestTaxesDepreciationAmortization0.00.00.00.00.0

Interest Expense Debt

us-gaap:InterestExpenseDebt

us-gaap:InterestExpenseDebt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value881517782797174737471746462615960595136242424232224262626272932323233
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.8102.247.669.3421.27.65.15.64.95.95.25.34.54.54.25.25.04.03.93.23.33.23.03.33.04.03.74.23.94.84.54.64.25.7

us-gaap:InterestExpenseDebt us-gaap:DebtInstrument

amch:ConvertibleNotesDue2026


Interest
Period End2021-06-302021-03-31
Value0.070
Percentage of InterestExpenseDebt0.046.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.047.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax amch:ConvertibleNotesDue20260.00.0

amch:SeniorUnsecuredConvertibleNotesDue2024


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-142018-09-30
Value7.47.88.38.38.48.28.08.09.7321.5
Percentage of InterestExpenseDebt9.69.410.411.611.311.210.811.213.12.30.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.66.543.90.90.60.60.50.70.00.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax amch:SeniorUnsecuredConvertibleNotesDue20240.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpenseDebt us-gaap:DebtInstrument, us-gaap:SubsequentEventType

amch:ConvertibleNotesDue2026, us-gaap:SubsequentEvent


Interest
Period End2021-01-27
Value70
Percentage of InterestExpenseDebt0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax amch:ConvertibleNotesDue2026 us-gaap:SubsequentEvent0.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-343.6-566.9-945.8-905.8-561.2-2176.3-13.5-54.849-130.2170-100.42217-276.4-42.7-176.58.429302428
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-77.3-382.3-582.0-758.0-2969.3-231.2-0.9-4.23.3-10.812.1-8.21.61.3-19.5-3.6-14.70.73.13.93.13.7

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Net
Period End2021-03-31
Value-0.3
Percentage of NetIncomeLoss0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.0

us-gaap:Parent


Net
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-566.9-905.8-561.2-2176.3-54.849-130.2
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-382.3-758.0-2969.3-231.2-4.23.3-10.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent0.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Net
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-566.9-905.8-561.2-2176.3-54.849-130.2-100.42217-42.7-176.58.4
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-382.3-758.0-2969.3-231.2-4.23.3-10.8-8.21.61.3-3.6-14.70.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-31
Value-400000.0-300000.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.2

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-4.02.3-11.81.8-1.52.14.75.32.32.57.86.65.73.78.13.73.55.37.1175.83.83.4
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.91.6-7.31.5-7.90.20.30.40.20.20.60.50.40.30.60.30.30.40.80.70.50.4

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-296.6-427.8-969.6-675.4-471.6-1986.14320105-33.787-21.98910970-4.3-19.65532655559753594326028681733577719
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-66.7-288.5-596.7-565.2-2495.2-211.03.01.67.0-2.86.2-1.86.57.95.0-0.4-1.64.33.58.47.37.79.65.211.54.98.54.59.42.84.78.310.23.4

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-12-312014-09-30
Value4217116-125.06.6-26.9-8.31.323-29.8165-54.1-2.2-1.2-0.60.6-1.02.70.441-0.0790.11-1.4110.0-9.273-0.0530.011
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.611.771.6-104.634.9-2.9-0.60.11.6-2.511.7-4.4-0.2-0.1-0.00.1-0.10.20.0-0.00.0-0.20.0-1.1-0.00.0

us-gaap:OtherNonoperatingIncomeExpense us-gaap:DebtInstrument

amch:SeniorUnsecuredConvertibleNotesDue2024


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.05.96.420325.77.115
Percentage of OtherNonoperatingIncomeExpense0.0-4.797.0-74.7-392.8438.530.3-50.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.04.933.92.12.30.40.51.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax amch:SeniorUnsecuredConvertibleNotesDue20240.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-344.0-567.2-946.1-905.8-561.2-2176.3-13.5-54.849-130.2170-100.42217-276.4-42.7-176.58.4
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-77.4-382.5-582.2-758.0-2969.3-231.2-0.9-4.23.3-10.812.1-8.21.61.3-19.5-3.6-14.70.7

us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

amch:DigitalCinemaImplementationPartnersLLC


Profit
Period End2020-09-302019-09-30
Value-30.622
Percentage of ProfitLoss3.4-40.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-25.61.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax amch:DigitalCinemaImplementationPartnersLLC0.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value44414816211918941144713161506120014131221138313831416117812021281926779763766783688821653712633726622712695762577
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

amch:TotalOtherProductAndService


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5028372717851329911810011585100102104636666
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.319.423.023.093.19.19.17.67.88.38.27.07.37.47.45.45.65.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.319.423.023.093.19.19.17.67.88.38.27.07.37.47.45.45.65.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax amch:TotalOtherProductAndService100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Admission


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2336980620.9568877797895731862751896875897753
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax52.446.949.452.64.860.360.660.559.560.961.061.564.863.263.363.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax52.446.949.452.64.860.360.660.559.560.961.061.564.863.263.363.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Admission100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Advertising


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1916191614294032353439313337
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.411.412.114.175.73.22.82.42.42.92.82.62.42.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.411.412.114.175.73.22.82.42.42.92.82.62.42.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Advertising100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FoodAndBeverage


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1615044290.4288438420492368435384445405415361
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.333.827.624.42.130.630.331.932.730.730.831.532.229.329.330.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.333.827.624.42.130.630.331.932.730.730.831.532.229.329.330.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:FoodAndBeverage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductAndServiceOther


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value301117103.3559167826576546665
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.98.011.08.917.55.96.35.15.55.55.44.44.84.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.98.011.08.917.55.96.35.15.55.55.44.44.84.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductAndServiceOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TimingOfTransferOfGoodOrService

us-gaap:TransferredAtPointInTime


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value414126134963.685113351215141011101326116213331333
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax93.185.582.680.619.090.592.392.393.692.593.995.296.496.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax93.185.582.680.619.090.592.392.393.692.593.995.296.496.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TransferredAtPointInTime100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TransferredOverTime


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value302128231589112101959086595050
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.914.517.419.481.09.57.77.76.47.56.14.83.63.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.914.517.419.481.09.57.77.76.47.56.14.83.63.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TransferredOverTime100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value44414816211918941144713161506120014131221144213831416117812021283926779763766783688821653712633726622712695762577
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0104.3100.0100.0100.0100.0100.2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, amch:InternationalMarkets


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value691160723.2280423346344333
Percentage of Revenues15.77.537.060.416.929.829.326.322.927.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.77.537.060.416.929.829.326.322.927.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments amch:InternationalMarkets0.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, amch:UsMarkets


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value374137102471566110249701161867
Percentage of Revenues84.392.563.039.683.170.270.773.777.172.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax84.392.563.039.683.170.270.773.777.172.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments amch:UsMarkets0.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

amch:DigitalCinemaImplementationPartnersLLC


Revenuesus-gaap:
Period End2020-09-302019-09-30
Value1.140
Percentage of Revenues0.93.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.93.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax amch:DigitalCinemaImplementationPartnersLLC0.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value11329104881027610876112711123813675132811351413473949593639531968598059910981199408641496949484931511046674739466247634612470948135046
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Assetsus-gaap:
Period End2020-12-312019-12-31
Value6151182
Percentage of Assets6.08.6
Percentage of Assets6.08.6
Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value12733127751313413211128471231212461120981218912169809781087561760076927485733473386631340233943383357031513216316432493102318333003537
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets112.4121.8127.8121.5114.0109.691.191.190.290.385.386.679.378.578.475.574.773.876.768.568.668.669.967.567.967.968.267.367.668.670.1

us-gaap:Liabilities us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Liabilitiesus-gaap:
Period End2020-12-312019-12-31
Value394482
Percentage of Liabilities3.03.9
Percentage of Assets3.83.5
Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees64.140.8

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value11329104881027610876112711123813675132811351413473949593639531968598059910981199408641496949484931511046674739466247634612470948135046
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Liabilities
Period End2020-12-312019-12-31
Value6151182
Percentage of LiabilitiesAndStockholdersEquity6.08.6
Percentage of Assets6.08.6
Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value-1404.7-2309.4-2885.1-2370.1-1575.4-1074.01214118313251303139712541969208421122424247626002009156515521546153815131521149615121509152415111507766
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-12.4-22.0-28.1-21.8-14.0-9.68.98.99.89.714.713.420.721.521.524.525.226.223.331.531.431.430.132.432.132.131.832.732.431.429.90.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value-17.6-17.9-21.4-16.4-16.6-17.2-17.3-1.6-1.7-1.7-1.8-7.4-7.5-7.2-6.6-4.1-4.1-3.5-3.569-3.276-3.281-3.285-3.289-4.597-3.493-3.4995.5641920
Percentage of StockholdersEquity1.30.80.70.71.11.6-1.4-0.1-0.1-0.1-0.1-0.6-0.4-0.3-0.3-0.2-0.2-0.1-0.2-0.2-0.2-0.2-0.2-0.3-0.2-0.20.41.31.4
Percentage of Assets-0.2-0.2-0.2-0.2-0.1-0.2-0.1-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.10.10.40.4
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-312012-12-31
Value8.2-12.338-52.0-63.6-119.6-26.1-96.7-28.6-19.45.5263314012510572-4.4-2.5512.071.5960.9222.8041.1463.1084.2281224249.444
Percentage of StockholdersEquity-0.60.5-1.32.24.011.1-2.1-8.2-2.2-1.50.42.11.76.75.94.42.9-0.2-0.10.10.10.10.20.10.20.30.81.61.61.2
Percentage of Assets0.1-0.10.4-0.5-0.6-1.1-0.2-0.7-0.2-0.10.10.30.41.51.31.10.7-0.0-0.00.00.00.00.10.00.10.10.30.50.50.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value255.660-35.6-47.0-102.4-8.8-95.1-26.9-17.77.2333914512910773-4.0-1.782.8672.7072.032.1011.6081.011.7050.6270.306-0.351
Percentage of StockholdersEquity-1.8-0.2-2.11.53.09.5-0.7-8.0-2.0-1.40.52.72.07.06.14.43.0-0.2-0.10.20.20.10.10.10.10.10.00.0-0.0
Percentage of Assets0.20.10.6-0.3-0.4-0.9-0.1-0.7-0.2-0.10.10.40.41.51.31.10.7-0.0-0.00.10.10.00.00.00.00.00.00.0-0.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value20121016487608679551673448590551781686840738872622622891683195255286414347462387509369474601843
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.89.74.75.66.04.94.93.44.44.18.27.38.87.68.96.36.39.07.93.95.25.88.17.59.88.310.78.010.112.516.7

us-gaap:AssetsCurrent us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Assets
Period End2020-12-312019-12-31
Value267339
Percentage of AssetsCurrent54.950.4
Percentage of Assets2.62.5
Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees43.528.7

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-08-31
Value1811813308417498299265100190184313333316300310260127313207469310721197179144218155235353546130136106133100
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets16.07.83.03.84.42.71.90.81.41.43.33.63.33.13.22.61.33.12.40.91.92.24.12.13.83.14.63.45.07.310.80.00.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value1839842321428508309275110201195324344327312318291159336230211
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets16.28.03.13.94.52.82.00.81.51.43.43.73.43.23.22.91.63.42.74.1

Receivables Net Current

us-gaap:ReceivablesNetCurrent

us-gaap:ReceivablesNetCurrent


Receivables
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value888691977012625415722819325915517916727112815314421357678510556814899426353106
Percentage of ReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.80.90.90.61.11.91.21.71.42.71.71.91.72.81.31.61.52.51.21.41.72.11.21.71.02.10.91.31.12.1

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value84877482100115143180160162197187203204202226223211262919493978493868480828380
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.80.70.80.91.01.01.41.21.22.12.02.12.12.12.32.32.13.01.81.91.91.91.82.01.91.81.81.81.71.6

Noncurrent Assets

us-gaap:NoncurrentAssets

us-gaap:NoncurrentAssets


Noncurrent
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value93169472978910267105911068613002128321292412921871486768690894789339288918990497958795879587958469542534203
Percentage of NoncurrentAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets82.290.395.394.494.095.195.196.695.695.991.892.791.292.491.193.793.791.092.1160.1160.8161.491.989.383.3

us-gaap:NoncurrentAssets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, amch:InternationalMarkets


Noncurrent
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value2703274428943177305929873963
Percentage of NoncurrentAssets29.029.029.630.928.928.030.5
Percentage of Assets23.926.228.229.227.126.629.0
Percentage of Assets us-gaap:OperatingSegments amch:InternationalMarkets0.00.00.00.00.00.00.0

us-gaap:OperatingSegments, amch:UsMarkets


Noncurrent
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value6613672768957090753276989039
Percentage of NoncurrentAssets71.071.070.469.171.172.069.5
Percentage of Assets58.464.167.165.266.868.566.1
Percentage of Assets us-gaap:OperatingSegments amch:UsMarkets0.00.00.00.00.00.00.0

Assets Noncurrent

us-gaap:AssetsNoncurrent us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:AssetsNoncurrent

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Assets
Period End2020-12-312019-12-31
Value347843
Percentage of AssetsNoncurrent100.0100.0
Percentage of Assets3.46.2
Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees56.571.3

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-31
Value44924388
Percentage of PropertyPlantAndEquipmentGross100.0100.0
Percentage of Assets43.732.1

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

amch:FurnitureFixturesAndEquipment


Property
Period End2020-12-312019-12-31
Value23432216
Percentage of PropertyPlantAndEquipmentGross52.250.5
Percentage of Assets22.816.2
Percentage of Assets amch:FurnitureFixturesAndEquipment0.00.0

us-gaap:BuildingAndBuildingImprovements


Property
Period End2020-12-312019-12-31
Value222230
Percentage of PropertyPlantAndEquipmentGross4.95.3
Percentage of Assets2.21.7
Percentage of Assets us-gaap:BuildingAndBuildingImprovements0.00.0

us-gaap:Land


Property
Period End2020-12-312019-12-31
Value92106
Percentage of PropertyPlantAndEquipmentGross2.12.4
Percentage of Assets0.90.8
Percentage of Assets us-gaap:Land0.00.0

us-gaap:LeaseholdImprovements


Property
Period End2020-12-312019-12-31
Value18331834
Percentage of PropertyPlantAndEquipmentGross40.841.8
Percentage of Assets17.813.4
Percentage of Assets us-gaap:LeaseholdImprovements0.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312019-12-31
Value2417233022321812
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0
Percentage of Assets21.322.221.713.3

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value22602332241725202649258126132600303930283028309131163244325431623035153714471409140113131278126612471214120711921179
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets22.021.421.422.419.419.419.319.332.032.331.831.931.832.733.231.835.130.929.328.627.428.127.027.226.226.325.624.823.4

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312017-01-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value247224912547287429882938478946934763478747884820483049444931488948324823482339322410241024102406228922892289228922892289228922892249
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets21.823.724.826.426.526.135.035.335.235.550.451.550.751.050.349.349.248.50.045.548.548.748.947.149.148.349.148.149.648.647.645.40.0

us-gaap:Goodwill us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring


Goodwillus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-31
Value2547287429382938
Percentage of Goodwill100.0100.098.3100.0
Percentage of Assets24.826.426.126.1
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsNonrecurring0.00.00.00.0

us-gaap:Goodwill us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsNonrecurring


Goodwillus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-31
Value2547287429382938
Percentage of Goodwill100.0100.098.3100.0
Percentage of Assets24.826.426.126.1
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure us-gaap:FairValueMeasurementsNonrecurring0.00.00.00.0

us-gaap:Goodwill us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsNonrecurring


Goodwillus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-31
Value40515617441744
Percentage of Goodwill15.95.558.459.4
Percentage of Assets3.91.415.515.5
Percentage of Assets us-gaap:FairValueMeasurementsNonrecurring0.00.00.00.0

us-gaap:Goodwill us-gaap:ReportingUnit

amch:DomesticTheatres


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1796179617961796194719473072
Percentage of Goodwill72.772.170.562.565.266.364.2
Percentage of Assets15.917.117.516.517.317.322.5
Percentage of Assets amch:DomesticTheatres0.00.00.00.00.00.00.0

amch:InternationalTheatres


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value675694750107710409901716
Percentage of Goodwill27.327.929.537.534.833.735.8
Percentage of Assets6.06.67.39.99.28.812.6
Percentage of Assets amch:InternationalTheatres0.00.00.00.00.00.00.0

us-gaap:Goodwill us-gaap:StatementGeographical

country:US


Goodwillus-gaap:
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-312014-12-31
Value179631003072307230723072307230723072307230473045304424062289
Percentage of Goodwill70.564.765.564.564.264.263.763.662.162.362.363.077.4100.0100.0
Percentage of Assets17.522.723.122.722.832.432.832.231.731.330.731.035.247.148.1
Percentage of Assets country:US0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NonUs


Goodwillus-gaap:
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value75017161621169017151716174817581871185918421787888
Percentage of Goodwill29.535.834.535.535.835.836.336.437.937.737.737.022.6
Percentage of Assets7.312.612.212.512.718.118.718.419.319.018.618.210.3
Percentage of Assets us-gaap:NonUs0.00.00.00.00.00.00.00.00.00.00.00.00.0

Indefinite Lived Intangible Assets Excluding Goodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill


Indefinite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value152165166169155112104104
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.21.81.71.82.22.22.1

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring


Indefinite
Period End2020-12-312020-09-302020-06-302020-03-31
Value44435050
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill28.90.00.00.0
Percentage of Assets0.40.40.40.4
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsNonrecurring0.00.00.00.0

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsNonrecurring


Indefinite
Period End2020-12-312020-09-302020-06-302020-03-31
Value44435050
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill28.90.00.00.0
Percentage of Assets0.40.40.40.4
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure us-gaap:FairValueMeasurementsNonrecurring0.00.00.00.0

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsNonrecurring


Indefinite
Period End2020-12-312020-09-302020-06-302020-03-31
Value2.34.68.38.3
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill1.50.00.00.0
Percentage of Assets0.00.00.10.1
Percentage of Assets us-gaap:FairValueMeasurementsNonrecurring0.00.00.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value156158163164174175195193197199352359365378380387389362365231233235237219221223225227229232234
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.41.51.61.51.51.61.41.51.51.53.73.83.83.93.93.94.03.64.24.74.74.84.64.74.74.84.74.94.94.84.6

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FairValueByMeasurementFrequency

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FairValueMeasurementsNonrecurring


Finite
Period End2020-09-302020-06-302020-03-31
Value6400000.08000000.08000000.0
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0
Percentage of Assets0.10.10.1
Percentage of Assets us-gaap:FairValueMeasurementsNonrecurring0.00.00.0

Deferred Tax Assets Liabilities Net

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:DeferredTaxAssetsLiabilitiesNet


Deferred
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312015-12-312014-12-312013-12-31
Value4024192014131416202017469126181206
Percentage of DeferredTaxAssetsLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.20.10.20.10.10.20.20.20.21.80.82.53.84.1

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4308434844514475455546024796479447984809
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets38.041.543.341.240.441.035.136.135.535.7

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value6956124124123
Percentage of OperatingLeaseRightOfUseAsset1.61.32.72.72.6
Percentage of Assets0.70.51.11.10.9
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsNonrecurring0.00.00.00.00.0

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsNonrecurring


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value6956124124123
Percentage of OperatingLeaseRightOfUseAsset1.61.32.72.72.6
Percentage of Assets0.70.51.11.10.9
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure us-gaap:FairValueMeasurementsNonrecurring0.00.00.00.00.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value261273304419455450503537520493505438438505475544509595533518508483523433436419417415410400402
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.32.63.03.94.04.03.74.13.93.75.34.74.65.24.95.55.26.06.210.410.39.810.29.39.29.08.89.08.78.38.0

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementFrequency

us-gaap:EquitySecuritiesFvNi

us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value1210101011
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.1
Percentage of Assets us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.0

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value235264298376436337543361423382452395535454569469477510501261298240313212268210262181258223268
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.12.52.93.53.93.04.02.73.12.84.84.25.64.75.84.74.95.15.85.36.04.96.14.55.74.55.53.95.54.75.3

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value1558158415781588171116121933164717131692132811581243122214091180114612381189595620583712558616554636503583553657
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.815.115.414.615.214.314.112.412.712.614.012.413.012.614.411.911.712.513.812.012.511.813.912.013.011.913.410.912.411.513.0

us-gaap:LiabilitiesCurrent us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Liabilities
Period End2020-12-312019-12-31
Value181222
Percentage of LiabilitiesCurrent11.511.5
Percentage of Assets1.81.6
Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees29.418.8

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value202020202020202121151515151015
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.20.10.20.20.10.20.20.20.20.3

us-gaap:LongTermDebtCurrent us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2020202020202021211515
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.20.10.20.20.10.2
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.0

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value604591583511581581585568570570
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.35.65.74.75.25.24.34.34.24.2

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value286291257268257263324338317342378387312348351337289330328151131141158160153136136148141135170
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.82.52.52.32.32.42.52.42.54.04.13.33.63.63.43.03.33.83.12.72.93.13.43.22.92.93.23.02.83.4

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value87114157146118231419
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.81.71.51.40.50.30.4

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:LiabilitiesNoncurrent

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Liabilities
Period End2020-12-312019-12-31
Value213260
Percentage of LiabilitiesNoncurrent100.0100.0
Percentage of Assets2.11.9
Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees34.722.0

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2021-06-302020-12-312020-09-302019-12-312018-12-31
Value52145411544849104867
Percentage of LongTermDebt100.0100.0100.0100.0100.0
Percentage of Assets46.052.750.135.951.3

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value5480543956955803549850204733471047134737470748404202424442204277424941803745184318241851192417461748177117751780178319322069
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets48.451.955.453.448.844.734.635.534.935.249.651.744.143.843.043.243.342.143.337.136.937.537.737.436.938.037.338.637.940.141.0

us-gaap:LongTermDebtNoncurrent us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302015-06-302015-03-31
Value54805439569558035498502047334710471347374707483317481771
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.9100.0100.0
Percentage of Assets48.451.955.453.448.844.734.635.534.935.249.651.636.938.0
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Deferred Finance Costs Noncurrent Net

us-gaap:DeferredFinanceCostsNoncurrentNet

us-gaap:DeferredFinanceCostsNoncurrentNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value8.3116.79.57.70731137.841
Percentage of DeferredFinanceCostsNoncurrentNet100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.60.30.2

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value28344043434746495145414444484947462620
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.40.40.40.40.30.40.40.30.40.50.50.50.50.50.50.30.2

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value6459546244424830
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.40.60.60.50.81.00.6

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-03-312020-12-312020-09-30
Value222634
Percentage of MinorityInterest100.0100.0100.0
Percentage of Assets0.20.30.3

us-gaap:MinorityInterest us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, amch:ForumCinemasOu


Minority
Period End2020-08-28
Value34
Percentage of MinorityInterest0.0
Percentage of Assets0.0
Percentage of Assets us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations amch:ForumCinemasOu0.0

us-gaap:MinorityInterest us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

amch:ForumCinemasOu


Minority
Period End2021-03-312020-09-30
Value2234
Percentage of MinorityInterest100.0100.0
Percentage of Assets0.20.3
Percentage of Assets amch:ForumCinemasOu0.00.0

us-gaap:MinorityInterest us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

amch:LithuaniaAndEstonia, us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, amch:ForumCinemasOu


Minority
Period End2020-12-31
Value26
Percentage of MinorityInterest100.0
Percentage of Assets0.3
Percentage of Assets amch:LithuaniaAndEstonia us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations amch:ForumCinemasOu0.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value188207241240220212195190192188963980963937903847746726706513492484462438437419419394387378370
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.72.02.32.22.01.91.41.41.41.410.110.510.19.79.28.67.67.38.210.310.09.89.19.49.29.08.88.68.27.97.4

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4888490849574909474447844913485748524826
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets43.246.848.245.142.142.635.936.635.935.8

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value941895971922
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0
Percentage of Assets8.38.59.58.5

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value816792862830
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0
Percentage of Assets7.27.68.47.6

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value770756785763
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0
Percentage of Assets6.87.27.67.0

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value704691752728
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0100.0100.0
Percentage of Assets6.26.67.36.7

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value3768371943714228
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0100.0100.0
Percentage of Assets33.335.542.538.9

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-30
Value5493550055415420
Percentage of OperatingLeaseLiability100.0100.0100.0100.0
Percentage of Assets48.552.453.949.8

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value8574865387888658
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0
Percentage of Assets75.782.585.579.6

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value3081315332463237
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0
Percentage of Assets27.230.131.629.8

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value-1404.7-2309.4-2885.1-2370.1-1575.4-1074.01214118313251303139712541969208421122424247626002009156515521546153815131521149615121509152415111507766
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-12.4-22.0-28.1-21.8-14.0-9.68.98.99.89.714.713.420.721.521.524.525.226.223.331.531.431.430.132.432.132.131.832.732.431.429.90.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value-17.6-17.9-21.4-16.4-16.6-17.2-17.3-1.6-1.7-1.7-1.8-7.4-7.5-7.2-6.6-4.1-4.1-3.5-3.569-3.276-3.281-3.285-3.289-4.597-3.493-3.4995.5641920
Percentage of StockholdersEquity1.30.80.70.71.11.6-1.4-0.1-0.1-0.1-0.1-0.6-0.4-0.3-0.3-0.2-0.2-0.1-0.2-0.2-0.2-0.2-0.2-0.3-0.2-0.20.41.31.4
Percentage of Assets-0.2-0.2-0.2-0.2-0.1-0.2-0.1-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.10.10.40.4
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-312012-12-31
Value8.2-12.338-52.0-63.6-119.6-26.1-96.7-28.6-19.45.5263314012510572-4.4-2.5512.071.5960.9222.8041.1463.1084.2281224249.444
Percentage of StockholdersEquity-0.60.5-1.32.24.011.1-2.1-8.2-2.2-1.50.42.11.76.75.94.42.9-0.2-0.10.10.10.10.20.10.20.30.81.61.61.2
Percentage of Assets0.1-0.10.4-0.5-0.6-1.1-0.2-0.7-0.2-0.10.10.30.41.51.31.10.7-0.0-0.00.00.00.00.10.00.10.10.30.50.50.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value255.660-35.6-47.0-102.4-8.8-95.1-26.9-17.77.2333914512910773-4.0-1.782.8672.7072.032.1011.6081.011.7050.6270.306-0.351
Percentage of StockholdersEquity-1.8-0.2-2.11.53.09.5-0.7-8.0-2.0-1.40.52.72.07.06.14.43.0-0.2-0.10.20.20.10.10.10.10.10.00.0-0.0
Percentage of Assets0.20.10.6-0.3-0.4-0.9-0.1-0.7-0.2-0.10.10.40.41.51.31.10.7-0.0-0.00.10.10.00.00.00.00.00.00.0-0.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-31
Value-1404.7-2287.0-2858.2-2335.4-1575.4-1074.0121413972112
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-12.4-21.8-27.8-21.5-14.0-9.68.914.721.5

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Stockholders
Period End2020-12-312019-12-31
Value220699
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-7.757.6
Percentage of Assets2.15.1
Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees35.959.2

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementClassOfStock

us-gaap:CommonClassA


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-31
Value0.60.50.50.5
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.0-0.0-0.00.0
Percentage of Assets0.00.00.00.0
Percentage of Assets us-gaap:CommonClassA0.00.00.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonClassA, us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value5.14.51.80.50.50.50.50.50.50.50.5
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.4-0.2-0.1-0.0-0.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassA us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonClassB, us-gaap:CommonStock


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value0.50.50.50.50.50.50.50.50.50.8
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.0-0.0-0.0-0.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassB us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value8.2-12.338-52.0-63.6-119.6-26.1-96.7-28.6-19.45.5125
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.60.5-1.42.24.011.1-2.10.00.00.00.45.9
Percentage of Assets0.1-0.10.4-0.5-0.6-1.1-0.2-0.7-0.2-0.10.11.3
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value484736572465212520072003200120082006200119982241
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-345.1-159.9-86.3-91.0-127.4-186.6164.90.00.00.0143.0106.1
Percentage of Assets42.834.924.019.517.817.814.615.114.814.921.022.9
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Stockholders
Period End2021-03-312020-12-312020-09-30
Value222634
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-1.0-0.9-1.5
Percentage of Assets0.20.30.3
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.0

us-gaap:Parent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value-1404.7-2309.4-2885.1-2370.1-1575.4-1074.0121411831325130313972112
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0101.0100.9101.5100.0100.0100.00.00.00.0100.0100.0
Percentage of Assets-12.4-22.0-28.1-21.8-14.0-9.68.98.99.89.714.721.5
Percentage of Assets us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value-6265.4-5902.3-5335.3-4387.8-3463.7-2902.6-706.2-673.5-597.7-623.4-550.9-207.9
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest446.0258.1186.7187.9219.9270.3-58.20.00.00.0-39.4-9.8
Percentage of Assets-55.3-56.3-51.9-40.3-30.7-25.8-5.2-5.1-4.4-4.6-5.8-2.1
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStockCommon


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value-56.4-56.4-56.4-56.4-56.4-56.4-56.4-56.4-56.4-56.4-48.2
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest2.52.02.43.65.3-4.60.00.00.0-4.0-2.3
Percentage of Assets-0.5-0.5-0.5-0.5-0.5-0.4-0.4-0.4-0.4-0.6-0.5
Percentage of Assets us-gaap:TreasuryStockCommon0.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value5100000.04500000.01800000.0600000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0600000.0600000.0342000.0215000.0215000.0215000.0214000.0214000.0214000.0214000.0214000.0214000.0214000.0214000.0214000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonClassB


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0500000.0800000.0800000.0800000.0800000.0800000.0800000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0758000.0
Percentage of CommonStockValue27.883.3100.0100.0100.0100.0100.0100.0100.0100.0160.0160.0160.0160.0133.3133.3221.6352.6352.6352.6354.2354.2354.2354.2354.2354.2354.2354.2354.2
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassB0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value4847365724652125200720032001200820062001199819942247224222412240224022371627118711851184118311821179117811721167116811671161
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets42.834.924.019.517.817.814.615.114.814.921.021.323.623.222.922.622.822.518.823.924.024.023.225.324.925.324.625.324.824.323.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value-6265.4-5902.3-5335.3-4387.8-3463.7-2902.6-706.2-673.5-597.7-623.4-550.9-710.6-255.5-251.7-207.994163366384376365360352330337313327316329317321
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-55.3-56.3-51.9-40.3-30.7-25.8-5.2-5.1-4.4-4.6-5.8-7.6-2.7-2.6-2.11.01.73.74.47.67.47.36.97.17.16.76.96.97.06.66.4

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value8.2-12.338-52.0-63.6-119.6-26.1-96.7-28.6-19.45.5263314012510572-4.4-2.5512.071.5960.9222.8041.1463.1084.22812242626246.78417139.444
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.1-0.10.4-0.5-0.6-1.1-0.2-0.7-0.2-0.10.10.30.41.51.31.10.7-0.0-0.00.00.00.00.10.00.10.10.30.50.60.50.50.00.00.00.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-03-312020-12-312020-09-30
Value222634
Percentage of MinorityInterest100.0100.0100.0
Percentage of Assets0.20.30.3

us-gaap:MinorityInterest us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, amch:ForumCinemasOu


Minority
Period End2020-08-28
Value34
Percentage of MinorityInterest0.0
Percentage of Assets0.0
Percentage of Assets us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations amch:ForumCinemasOu0.0

us-gaap:MinorityInterest us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

amch:ForumCinemasOu


Minority
Period End2021-03-312020-09-30
Value2234
Percentage of MinorityInterest100.0100.0
Percentage of Assets0.20.3
Percentage of Assets amch:ForumCinemasOu0.00.0

us-gaap:MinorityInterest us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

amch:LithuaniaAndEstonia, us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, amch:ForumCinemasOu


Minority
Period End2020-12-31
Value26
Percentage of MinorityInterest100.0
Percentage of Assets0.3
Percentage of Assets amch:LithuaniaAndEstonia us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations amch:ForumCinemasOu0.0

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:StockIssuedDuringPeriodValueNewIssues


Stock
Period End2021-06-302021-03-312020-09-302017-12-312017-09-302017-06-302017-03-31
Value9895812.80.00.0-0.9617
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0100.00.00.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:CounterpartyName

amch:MudrickCapitalManagementLp


Stock
Period End2021-06-30
Value230
Percentage of StockIssuedDuringPeriodValueNewIssues23.3
Percentage of Assets0.0
Percentage of Assets amch:MudrickCapitalManagementLp0.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:CounterpartyName, us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

amch:MudrickCapitalManagementLp, us-gaap:CommonClassA, us-gaap:CommonStock


Stock
Period End2021-06-30
Value0.1
Percentage of StockIssuedDuringPeriodValueNewIssues0.0
Percentage of Assets0.0
Percentage of Assets amch:MudrickCapitalManagementLp us-gaap:CommonClassA us-gaap:CommonStock0.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:CounterpartyName, us-gaap:StatementEquityComponents

amch:MudrickCapitalManagementLp, us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-30
Value230
Percentage of StockIssuedDuringPeriodValueNewIssues23.3
Percentage of Assets0.0
Percentage of Assets amch:MudrickCapitalManagementLp us-gaap:AdditionalPaidInCapital0.0

amch:MudrickCapitalManagementLp, us-gaap:Parent


Stock
Period End2021-06-30
Value230
Percentage of StockIssuedDuringPeriodValueNewIssues23.3
Percentage of Assets0.0
Percentage of Assets amch:MudrickCapitalManagementLp us-gaap:Parent0.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonClassA, us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312017-03-31
Value0.51.80.2
Percentage of StockIssuedDuringPeriodValueNewIssues0.10.30.0
Percentage of Assets0.00.00.0
Percentage of Assets us-gaap:CommonClassA us-gaap:CommonStock0.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302017-06-302017-03-31
Value9515792.8-0.9617
Percentage of StockIssuedDuringPeriodValueNewIssues96.299.7100.0100.0100.0
Percentage of Assets0.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.0

us-gaap:Parent


Stock
Period End2021-06-302021-03-312020-09-30
Value9895812.8
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0100.0
Percentage of Assets0.00.00.0
Percentage of Assets us-gaap:Parent0.00.00.0

us-gaap:RetainedEarnings


Stock
Period End2021-06-30
Value-19.3
Percentage of StockIssuedDuringPeriodValueNewIssues-2.0
Percentage of Assets0.0
Percentage of Assets us-gaap:RetainedEarnings0.0

us-gaap:TreasuryStockCommon


Stock
Period End2021-06-30
Value56
Percentage of StockIssuedDuringPeriodValueNewIssues5.7
Percentage of Assets0.0
Percentage of Assets us-gaap:TreasuryStockCommon0.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-233.8-312.9-357.9-355.7-231.9-184.0368561521.42241.7131165329119-62.71722207711122258161712117812107-1.575152719735
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-52.6-211.0-220.2-297.7-1227.0-19.525.54.310.10.115.90.19.512.023.310.1-5.213.523.89.914.53.032.92.420.93.325.11.914.8-0.321.410.212.86.2

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value13-16.00.2-23.3-44.1-87.4-167.7-127.1-122.8-98.5-202.967-66.7-114.8-149.966-138.5-743.5-1106.3-120.302-76.373-51.625-292.314-72.826-72.882-71.378-88.2-68.772-56.488-58.231-88.506-71.878-70.099-38.301
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.0-10.80.1-19.5-233.3-9.3-11.6-9.7-8.2-8.2-14.45.5-4.8-8.3-10.65.7-11.5-58.0-119.5-15.4-10.0-6.7-37.3-10.6-8.9-10.9-12.4-10.8-7.8-9.4-12.4-10.3-9.2-6.6

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1212854247296473312-40.0-18.4-20.6-33.9-39.5-37.4-55.5-62.4-128.7-60.26.96741046-3.979-49.239-74.582147-24.603-63.837-23.645-27.799-23.378-169.325-133.362351-4.9622.435-24.228
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax272.6576.3152.5248.22505.333.2-2.8-1.4-1.4-2.8-2.8-3.1-4.0-4.5-9.1-5.10.652.6112.9-0.5-6.4-9.718.8-3.6-7.8-3.6-3.9-3.7-23.3-21.449.3-0.70.3-4.2

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value997520-107.4-79.619834164-90.66.0-128.8-20.31614-5.826131-176.5106
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax224.3351.1-66.1-66.61050.83.611.4-6.90.4-10.7-1.41.41.1-0.41.911.2-14.78.3

Amortization Of Financing Costs

us-gaap:AmortizationOfFinancingCosts

us-gaap:AmortizationOfFinancingCosts


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.4122.63.24.34.14.04.03.44.4
Percentage of AmortizationOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfFinancingCosts us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument

amch:OdeonCinemasGroupLimited, amch:FourHundredMillionTermLoanFacility


Amortization
Period End2021-06-30
Value0.0
Percentage of AmortizationOfFinancingCosts0.0

us-gaap:AmortizationOfFinancingCosts us-gaap:DebtInstrument

us-gaap:ConvertibleNotesPayable


Amortization
Period End2020-12-31
Value0.4
Percentage of AmortizationOfFinancingCosts15.4

us-gaap:AmortizationOfFinancingCosts us-gaap:DebtInstrument, us-gaap:IncomeStatementLocation

amch:FourHundredMillionTermLoanFacility, us-gaap:OtherExpense


Amortization
Period End2021-03-31
Value1.0
Percentage of AmortizationOfFinancingCosts8.3

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-6.1-6.2-1.2-0.2-5.871-40.7-1.94.84.1-2.9-1.5-3.51.5295-19.6-109.5-8.8-11.54516121633-10.953253.525124.22518-2.89-275.0282.82.832.8
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value10511413212311912211211211211313913013713014413513312582636260595857575554515450485048
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationDepletionAndAmortization us-gaap:StatementScenario

amch:AttributableEarningsBeforeInterestTaxesDepreciationAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.70.91.00.70.70.80.60.51.70.6
Percentage of DepreciationDepletionAndAmortization2.60.80.80.60.60.70.50.41.50.5

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-56.0-11.9-55.2-66.2114-169.8206-65.541-76.7105-149.065-107.1151-18.3-28.1-69.9138-70.08134-81.48111-75.59864-58.99877-68.51428-51.7188-62.82843-4.897
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-2.2115.6-19.3-6.0-23.54.31.07.7-5.51.51.08.1-4.58.113-4.8-0.4-1.21-0.526-1.419-1.059-4.294-0.402-0.4363.718-2.044-4.40816-8.0160.285-12.7419.7412.823
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-233.8-312.9-357.9-355.7-231.9-184.0368561521.42241.7131165329119-62.71722207711122258161712117812107-1.575152719735
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-52.6-211.0-220.2-297.7-1227.0-19.525.54.310.10.115.90.19.512.023.310.1-5.213.523.89.914.53.032.92.420.93.325.11.914.8-0.321.410.212.86.2

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-343.6-566.9-945.8-905.8-561.2-2176.3-13.5-54.849-130.2170-100.42217-276.4-42.7-176.58.429302428
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-77.3-382.3-582.0-758.0-2969.3-231.2-0.9-4.23.3-10.812.1-8.21.61.3-19.5-3.6-14.70.73.13.93.13.7

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Net
Period End2021-03-31
Value-0.3
Percentage of NetIncomeLoss0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.0

us-gaap:Parent


Net
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-566.9-905.8-561.2-2176.3-54.849-130.2
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-382.3-758.0-2969.3-231.2-4.23.3-10.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent0.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Net
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-566.9-905.8-561.2-2176.3-54.849-130.2-100.42217-42.7-176.58.4
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-382.3-758.0-2969.3-231.2-4.23.3-10.8-8.21.61.3-3.6-14.70.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-344.0-567.2-946.1-905.8-561.2-2176.3-13.5-54.849-130.2170-100.42217-276.4-42.7-176.58.4
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-77.4-382.5-582.2-758.0-2969.3-231.2-0.9-4.23.3-10.812.1-8.21.61.3-19.5-3.6-14.70.7

us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

amch:DigitalCinemaImplementationPartnersLLC


Profit
Period End2020-09-302019-09-30
Value-30.622
Percentage of ProfitLoss3.4-40.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-25.61.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax amch:DigitalCinemaImplementationPartnersLLC0.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value8.45.4153.13.72.7-7.12.15.44.04.04.14.02.81.8-0.13.90.10.3461.7051.7171.0871.1032.1991.4395.7395.221-1.5961.3116.357
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value13-16.00.2-23.3-44.1-87.4-167.7-127.1-122.8-98.5-202.967-66.7-114.8-149.966-138.5-743.5-1106.3-120.302-76.373-51.625-292.314-72.826-72.882-71.378-88.2-68.772-56.488-58.231-88.506-71.878-70.099-38.301
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.0-10.80.1-19.5-233.3-9.3-11.6-9.7-8.2-8.2-14.45.5-4.8-8.3-10.65.7-11.5-58.0-119.5-15.4-10.0-6.7-37.3-10.6-8.9-10.9-12.4-10.8-7.8-9.4-12.4-10.3-9.2-6.6

Payments To Acquire Productive Assets

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:PaymentsToAcquireProductiveAssets


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value17111729359116911811511420113313310715914915616116511682571177174698767595585706539
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireProductiveAssets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, amch:InternationalMarkets


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4.15.38.011103444343139
Percentage of PaymentsToAcquireProductiveAssets22.944.544.937.528.937.926.128.726.934.2

us-gaap:OperatingSegments, amch:UsMarkets


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value136.69.8182456125848475
Percentage of PaymentsToAcquireProductiveAssets77.155.555.162.571.162.173.971.373.165.8

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1212854247296473312-40.0-18.4-20.6-33.9-39.5-37.4-55.5-62.4-128.7-60.26.96741046-3.979-49.239-74.582147-24.603-63.837-23.645-27.799-23.378-169.325-133.362351-4.9622.435-24.228
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax272.6576.3152.5248.22505.333.2-2.8-1.4-1.4-2.8-2.8-3.1-4.0-4.5-9.1-5.10.652.6112.9-0.5-6.4-9.718.8-3.6-7.8-3.6-3.9-3.7-23.3-21.449.3-0.70.3-4.2

Payments Of Dividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value2.20.00.04.3202020212018625252578522620191919191919191919
Percentage of PaymentsOfDividends100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:DebtInstrumentInterestRateStatedPercentage

amch:OdeonCinemasGroupLimited, amch:FourHundredMillionTermLoanFacility, us-gaap:SubsequentEvent


Debt
Period End2021-02-15
Value10.75
Percentage of DebtInstrumentInterestRateStatedPercentage100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:OdeonCinemasGroupLimited amch:FourHundredMillionTermLoanFacility us-gaap:SubsequentEvent0.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:CreditFacility

amch:FirstLienNotesDue2025


Debt
Period End2021-06-302021-03-312020-12-312020-10-152020-09-302020-07-312020-06-302020-04-242020-04-232020-04-152019-12-31
Value10.510.510.510.510.510.50.1050.1050.1050.1050.105
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:FirstLienNotesDue20250.00.00.00.00.00.00.00.00.00.00.0

amch:OdeonRevolvingCreditFacilityDue2022Rate26


Debt
Period End2020-12-312020-06-302020-03-312019-12-31
Value2.60.0260.0260.026
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:OdeonRevolvingCreditFacilityDue2022Rate260.00.00.00.0

amch:OdeonRevolvingCreditFacilityDue2022Rate317


Debt
Period End2020-12-312020-06-302020-03-312019-12-31
Value2.57850.03170.03170.0317
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:OdeonRevolvingCreditFacilityDue2022Rate3170.00.00.00.0

amch:SecondLienNotesDue2026


Debt
Period End2020-07-31
Value10.0
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:SecondLienNotesDue20260.0

amch:SeniorSecuredCreditFacilityTermLoanDue2026


Debt
Period End2021-06-302021-03-312020-12-31
Value3.08553.1953.23
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:SeniorSecuredCreditFacilityTermLoanDue20260.00.00.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument

amch:FirstLienNotesDue2026


Debt
Period End2020-09-30
Value10.5
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:FirstLienNotesDue20260.0

amch:SeniorSubordinatedNotes5.75PercentDue2025


Debt
Period End2021-06-302021-03-312020-12-312020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-01-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-05
Value5.755.755.750.05750.05750.05750.05750.05750.05750.05750.058750.058750.058750.05750.05750.05750.05750.05750.0575
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:SeniorSubordinatedNotes5.75PercentDue20250.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

amch:SeniorSubordinatedNotes5.875PercentDue2026


Debt
Period End2021-06-302021-03-312020-12-312020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-11-08
Value5.8755.8755.8750.058750.058750.058750.058750.058750.058750.058750.058750.058750.058750.058750.05875
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:SeniorSubordinatedNotes5.875PercentDue20260.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

amch:SeniorSubordinatedNotes6.125PercentDue2027


Debt
Period End2021-06-302021-03-312020-12-312020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312017-03-172016-12-31
Value6.1256.1256.1250.061250.061250.061250.061250.061250.061250.061250.061250.061250.061250.061250.06125
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:SeniorSubordinatedNotes6.125PercentDue20270.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

amch:SeniorSubordinatedNotes6.375PercentDue2024


Debt
Period End2021-06-302021-03-312020-12-312020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-172017-01-312016-12-312016-11-08
Value6.3756.3756.3750.063750.063750.063750.063750.063750.063750.063750.063750.063750.063750.063750.063750.06375
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:SeniorSubordinatedNotes6.375PercentDue20240.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

amch:SeniorSubordinatedNotesDue5.75Percent2025


Debt
Period End2020-07-31
Value0.0575
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:SeniorSubordinatedNotesDue5.75Percent20250.0

amch:SeniorSubordinatedNotesDue5.875Percent2026


Debt
Period End2020-07-31
Value0.05875
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:SeniorSubordinatedNotesDue5.875Percent20260.0

amch:SeniorSubordinatedNotesDue6.125Percent2027


Debt
Period End2020-07-31
Value0.06125
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:SeniorSubordinatedNotesDue6.125Percent20270.0

amch:SeniorSubordinatedNotesDue6.375Percent2024


Debt
Period End2020-07-31
Value0.06375
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:SeniorSubordinatedNotesDue6.375Percent20240.0

amch:SeniorUnsecuredConvertibleNotesDue2024


Debt
Period End2020-12-312020-09-302020-07-312020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-09-14
Value2.952.952.950.02950.02950.02950.02950.02950.02950.0295
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:SeniorUnsecuredConvertibleNotesDue20240.00.00.00.00.00.00.00.00.00.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument, us-gaap:SubsequentEventType

amch:New10.500SeniorSecuredNotesDue2026, us-gaap:SubsequentEvent


Debt
Period End2020-07-31
Value0.105
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:New10.500SeniorSecuredNotesDue2026 us-gaap:SubsequentEvent0.0

amch:SeniorSubordinatedNotesDue6.375Percent2024, us-gaap:SubsequentEvent


Debt
Period End2020-07-132020-06-03
Value0.02950.06375
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations amch:SeniorSubordinatedNotesDue6.375Percent2024 us-gaap:SubsequentEvent0.00.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range, us-gaap:CreditFacility

srt:Maximum, us-gaap:RevolvingCreditFacility


Debt
Period End2020-12-312020-09-302020-06-30
Value2.742.760.0287
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:Maximum us-gaap:RevolvingCreditFacility0.00.00.0

srt:Minimum, us-gaap:RevolvingCreditFacility


Debt
Period End2020-12-312020-09-302020-06-30
Value2.652.650.0236
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:Minimum us-gaap:RevolvingCreditFacility0.00.00.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range, us-gaap:DebtInstrument

srt:Maximum, amch:SecondLienSubordinatedSecuredNotesDue2026


Debt
Period End2020-09-30
Value12.0
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:Maximum amch:SecondLienSubordinatedSecuredNotesDue20260.0

srt:Minimum, amch:SecondLienSubordinatedSecuredNotesDue2026


Debt
Period End2020-09-30
Value10.0
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:Minimum amch:SecondLienSubordinatedSecuredNotesDue20260.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

srt:Maximum, amch:SecondLienSubordinatedSecuredNotesDue2026, us-gaap:SubsequentEvent


Debt
Period End2020-07-31
Value0.12
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:Maximum amch:SecondLienSubordinatedSecuredNotesDue2026 us-gaap:SubsequentEvent0.0

srt:Minimum, amch:SecondLienSubordinatedSecuredNotesDue2026, us-gaap:SubsequentEvent


Debt
Period End2020-07-31
Value0.1
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:Minimum amch:SecondLienSubordinatedSecuredNotesDue2026 us-gaap:SubsequentEvent0.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range, us-gaap:LongtermDebtType

srt:Maximum, amch:DebtAgreementWithMudrickCapitalManagementLp


Debt
Period End2020-12-31
Value17.0
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:Maximum amch:DebtAgreementWithMudrickCapitalManagementLp0.0

srt:Minimum, amch:DebtAgreementWithMudrickCapitalManagementLp


Debt
Period End2020-12-31
Value15.0
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:Minimum amch:DebtAgreementWithMudrickCapitalManagementLp0.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.11.2-3.20.2180.073-0.115-0.0450.389-0.329-0.1590.209-0.856-0.021-0.007500.00750.39-0.0040.016-0.0370.39-0.046000.39-2.76-0.0180.392-0.255
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value13281542455500795489453423
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value12881566442479864615635630
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-08-30
Value33312215123030272424
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-08-30
Value7643123233381120.5090.790.8248232
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:AccruedDividendEquivalentAdjustment

amch:AccruedDividendEquivalentAdjustment


Accrued
Period End2021-06-302021-03-312020-06-30
Value200000.0100000.0-100000.0
Percentage of AccruedDividendEquivalentAdjustment100.0100.0100.0

amch:AccruedDividendEquivalentAdjustment us-gaap:StatementEquityComponents

us-gaap:Parent


Accrued
Period End2021-06-302021-03-31
Value200000.0100000.0
Percentage of AccruedDividendEquivalentAdjustment100.0100.0

us-gaap:RetainedEarnings


Accrued
Period End2021-06-302021-03-312020-06-30
Value200000.0100000.0-100000.0
Percentage of AccruedDividendEquivalentAdjustment100.0100.0100.0

amch:AccruedDividendEquivalentAjustment

amch:AccruedDividendEquivalentAjustment


Accrued
Period End2021-03-31
Value100000.0
Percentage of AccruedDividendEquivalentAjustment100.0

amch:AccruedDividendEquivalentAjustment us-gaap:StatementEquityComponents

us-gaap:Parent


Accrued
Period End2021-03-31
Value100000.0
Percentage of AccruedDividendEquivalentAjustment100.0

us-gaap:RetainedEarnings


Accrued
Period End2021-03-31
Value100000.0
Percentage of AccruedDividendEquivalentAjustment100.0

amch:AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization

amch:AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization


Adjusted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value150294-1670.9334-340.33.1269156237108264142244277288147135251181144129146
Percentage of AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, amch:InternationalMarkets


Adjusted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3294-398.275-98.76.9302-40.23530
Percentage of AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization21.832.023.822.529.0222.6112.3-25.714.928.4

us-gaap:OperatingSegments, amch:UsMarkets


Adjusted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value118200-1272.7259-241.6-3.8971-116.320277
Percentage of AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization78.268.076.277.571.0-122.6361.0-74.385.171.6

amch:AssetImpairmentChargesIncludingNonControllingInterest

amch:AssetImpairmentChargesIncludingNonControllingInterest


Asset
Period End2020-12-312020-09-302020-06-302020-03-31
Value4831950.01859
Percentage of AssetImpairmentChargesIncludingNonControllingInterest100.0100.00.0100.0

amch:AttributableEarningsBeforeInterestTaxesDepreciationAndAmortization

amch:AttributableEarningsBeforeInterestTaxesDepreciationAndAmortization


Attributable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value700000.0-800000.01100000.0-1400000.0600000.0-100000.0-8800000.0900000.02000000.0900000.03600000.02100000.0-400000.02000000.01600000.0800000.01000000.0
Percentage of AttributableEarningsBeforeInterestTaxesDepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:AttributableEarningsBeforeInterestTaxesDepreciationAndAmortization us-gaap:StatementScenario

amch:AttributableEarningsBeforeInterestTaxesDepreciationAmortization


Attributable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value700000.0-800000.01100000.0-1400000.0600000.0-100000.01200000.0900000.02000000.0900000.0
Percentage of AttributableEarningsBeforeInterestTaxesDepreciationAndAmortization100.0100.0100.0100.0100.0100.0-13.6100.0100.0100.0

amch:BusinessCombinationConsiderationSettlementValueOfUnitsReturnedUnderUnitAdjustmentAgreement amch:EquityMethodInvestmentActivityByClassification

amch:BusinessCombinationConsiderationSettlementValueOfUnitsReturnedUnderUnitAdjustmentAgreement

amch:ExhibitorServicesAgreement


Business
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.00.00.00.0-1.40.00.0
Percentage of BusinessCombinationConsiderationSettlementValueOfUnitsReturnedUnderUnitAdjustmentAgreement0.00.00.00.0100.00.00.0

amch:CashBurn

amch:CashBurn


Cash
Period End2020-09-30
Value388
Percentage of CashBurn100.0

amch:CashSavingsDueToInterestPayments us-gaap:Range, us-gaap:DebtInstrument

amch:CashSavingsDueToInterestPayments

srt:Maximum, us-gaap:SeniorSubordinatedNotes


Cash
Period End2020-07-31
Value180
Percentage of CashSavingsDueToInterestPayments100.0

srt:Minimum, us-gaap:SeniorSubordinatedNotes


Cash
Period End2020-07-31
Value120
Percentage of CashSavingsDueToInterestPayments66.7

amch:CashSavingsDueToInterestPayments us-gaap:Range, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

srt:Maximum, amch:SecondLienSubordinatedSecuredNotesDue2026, us-gaap:SubsequentEvent


Cash
Period End2020-07-31
Value180
Percentage of CashSavingsDueToInterestPayments100.0

srt:Maximum, us-gaap:SeniorSubordinatedNotes, us-gaap:SubsequentEvent


Cash
Period End2020-07-31
Value180
Percentage of CashSavingsDueToInterestPayments100.0

srt:Minimum, amch:SecondLienSubordinatedSecuredNotesDue2026, us-gaap:SubsequentEvent


Cash
Period End2020-07-31
Value120
Percentage of CashSavingsDueToInterestPayments66.7

srt:Minimum, us-gaap:SeniorSubordinatedNotes, us-gaap:SubsequentEvent


Cash
Period End2020-07-31
Value120
Percentage of CashSavingsDueToInterestPayments66.7

amch:ComprehensiveIncomeLossNetOfTaxIncludingInvestmentAttributableToNoncontrollingInterest

amch:ComprehensiveIncomeLossNetOfTaxIncludingInvestmentAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-30
Value21
Percentage of ComprehensiveIncomeLossNetOfTaxIncludingInvestmentAttributableToNoncontrollingInterest100.0

amch:ComprehensiveIncomeLossNetOfTaxIncludingInvestmentAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Comprehensive
Period End2021-06-30
Value21
Percentage of ComprehensiveIncomeLossNetOfTaxIncludingInvestmentAttributableToNoncontrollingInterest100.0

us-gaap:Parent


Comprehensive
Period End2021-06-30
Value21
Percentage of ComprehensiveIncomeLossNetOfTaxIncludingInvestmentAttributableToNoncontrollingInterest100.0

amch:ContractWithCustomerLiabilityForeignCurrencyTranslationAdjustment

amch:ContractWithCustomerLiabilityForeignCurrencyTranslationAdjustment


Contract
Period End2021-06-302021-03-312020-12-31
Value900000.0-3400000.02900000.0
Percentage of ContractWithCustomerLiabilityForeignCurrencyTranslationAdjustment100.0100.0100.0

amch:ContractWithCustomerLiabilityRevenueReclassed amch:EquityMethodInvestmentActivityByClassification

amch:ContractWithCustomerLiabilityRevenueReclassed

amch:ExhibitorServicesAgreement


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-4500000.0-4400000.0-4400000.0-4300000.0-4100000.0-4100000.0-4100000.0-3900000.0-3900000.0-3800000.0-3700000.0-3700000.0
Percentage of ContractWithCustomerLiabilityRevenueReclassed100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:ContractWithCustomerLiabilityRevenueReclassed us-gaap:ProductOrService

amch:TotalOtherProductAndService


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-5600000.0-900000.0-8000000.0-3600000.0-1000000.0-21200000.0
Percentage of ContractWithCustomerLiabilityRevenueReclassed124.420.5181.883.724.4517.1

us-gaap:Admission


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-14100000.0-7200000.0-6500000.0-23700000.01200000.0-89500000.0
Percentage of ContractWithCustomerLiabilityRevenueReclassed313.3163.6147.7551.2-29.32182.9

us-gaap:FoodAndBeverage


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-7400000.0-3900000.0-4700000.0-2200000.0-1300000.0-23800000.0
Percentage of ContractWithCustomerLiabilityRevenueReclassed164.488.6106.851.231.7580.5

amch:ContractsWithCustomersCashReceivedInAdvance

amch:ContractsWithCustomersCashReceivedInAdvance


Contracts
Period End2021-06-302021-03-312020-12-31
Value181517
Percentage of ContractsWithCustomersCashReceivedInAdvance100.0100.0100.0

amch:ContractsWithCustomersDeferredRevenueNegativeCommonUnitAdjustment amch:EquityMethodInvestmentActivityByClassification

amch:ContractsWithCustomersDeferredRevenueNegativeCommonUnitAdjustment

amch:ExhibitorServicesAgreement


Contracts
Period End2021-06-302021-03-31
Value0-9200000.0
Percentage of ContractsWithCustomersDeferredRevenueNegativeCommonUnitAdjustment0.0100.0

amch:ConvertibleDebtCarryingValueAdjustments us-gaap:DebtInstrument

amch:ConvertibleDebtCarryingValueAdjustments

us-gaap:ConvertibleNotesPayable


Convertible
Period End2020-12-31
Value2.9
Percentage of ConvertibleDebtCarryingValueAdjustments100.0

amch:DebtFeesPaidToThirdParties us-gaap:DebtInstrument

amch:DebtFeesPaidToThirdParties

us-gaap:SeniorSubordinatedNotes


Debt
Period End2020-12-312020-09-30
Value0.236
Percentage of DebtFeesPaidToThirdParties100.0100.0

amch:DebtInstrumentExchangeOfDebtPercentage us-gaap:DebtInstrument

amch:DebtInstrumentExchangeOfDebtPercentage

amch:SecondLienNotesDue2026


Debt
Period End2020-09-30
Value87.0
Percentage of DebtInstrumentExchangeOfDebtPercentage100.0

amch:DebtInstrumentExchangePricePercentageOfPrincipalAmountExchanged us-gaap:DebtInstrument

amch:DebtInstrumentExchangePricePercentageOfPrincipalAmountExchanged

amch:SeniorSubordinatedNotes5.75PercentDue2025


Debt
Period End2020-07-31
Value83.61
Percentage of DebtInstrumentExchangePricePercentageOfPrincipalAmountExchanged100.0

amch:SeniorSubordinatedNotes5.875PercentDue2026


Debt
Period End2020-07-31
Value90.65
Percentage of DebtInstrumentExchangePricePercentageOfPrincipalAmountExchanged108.4

amch:SeniorSubordinatedNotes6.125PercentDue2027


Debt
Period End2020-07-31
Value72.48
Percentage of DebtInstrumentExchangePricePercentageOfPrincipalAmountExchanged86.7

amch:SeniorSubordinatedNotes6.375PercentDue2024


Debt
Period End2020-07-31
Value99.2
Percentage of DebtInstrumentExchangePricePercentageOfPrincipalAmountExchanged118.6

amch:DebtInstrumentExchangePriceReductionOfPrincipalAmountExchanged us-gaap:DebtInstrument

amch:DebtInstrumentExchangePriceReductionOfPrincipalAmountExchanged

amch:SeniorSubordinatedNotes5.75PercentDue2025


Debt
Period End2020-07-31
Value501
Percentage of DebtInstrumentExchangePriceReductionOfPrincipalAmountExchanged100.0

amch:SeniorSubordinatedNotes5.875PercentDue2026


Debt
Period End2020-07-31
Value539
Percentage of DebtInstrumentExchangePriceReductionOfPrincipalAmountExchanged107.5

amch:SeniorSubordinatedNotes6.125PercentDue2027


Debt
Period End2020-07-31
Value344
Percentage of DebtInstrumentExchangePriceReductionOfPrincipalAmountExchanged68.6

amch:SeniorSubordinatedNotes6.375PercentDue2024


Debt
Period End2020-07-31
Value632
Percentage of DebtInstrumentExchangePriceReductionOfPrincipalAmountExchanged126.0

amch:DebtInstrumentInterestRatePaymentInCash us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

amch:DebtInstrumentInterestRatePaymentInCash

amch:OdeonCinemasGroupLimited, amch:FourHundredMillionTermLoanFacility, us-gaap:SubsequentEvent


Debt
Period End2021-02-15
Value11.25
Percentage of DebtInstrumentInterestRatePaymentInCash100.0

amch:DebtInstrumentPaidInKindInterestRatePercentage us-gaap:CreditFacility

amch:DebtInstrumentPaidInKindInterestRatePercentage

amch:FirstLienToggleNotesDue2026


Debt
Period End2021-06-302021-03-31
Value017.0
Percentage of DebtInstrumentPaidInKindInterestRatePercentage0.0100.0

amch:SecondLienNotesDue2026


Debt
Period End2020-07-31
Value12.0
Percentage of DebtInstrumentPaidInKindInterestRatePercentage0.0

amch:SecondLienSubordinatedSecuredNotesDue2026


Debt
Period End2021-06-302021-03-31
Value012.0
Percentage of DebtInstrumentPaidInKindInterestRatePercentage0.070.6

amch:DecreaseInAccumulatedEarningsDueToDerivativeAssetValuationAllowanceAdjustment

amch:DecreaseInAccumulatedEarningsDueToDerivativeAssetValuationAllowanceAdjustment


Decrease
Period End2020-09-30
Value-2400000.0
Percentage of DecreaseInAccumulatedEarningsDueToDerivativeAssetValuationAllowanceAdjustment100.0

amch:DecreaseInAccumulatedEarningsDueToDerivativeAssetValuationAllowanceAdjustment us-gaap:StatementEquityComponents

us-gaap:Parent


Decrease
Period End2020-09-30
Value-2400000.0
Percentage of DecreaseInAccumulatedEarningsDueToDerivativeAssetValuationAllowanceAdjustment100.0

us-gaap:RetainedEarnings


Decrease
Period End2020-09-30
Value-2400000.0
Percentage of DecreaseInAccumulatedEarningsDueToDerivativeAssetValuationAllowanceAdjustment100.0

amch:DeferredFinanceLeaseLiabilityChanges

amch:DeferredFinanceLeaseLiabilityChanges


Deferred
Period End2021-06-302021-03-31
Value-4800000.0-4600000.0
Percentage of DeferredFinanceLeaseLiabilityChanges100.0100.0

amch:DeferredVariableLeaseLiabilityChanges

amch:DeferredVariableLeaseLiabilityChanges


Deferred
Period End2021-06-302021-03-31
Value-1400000.0-25900000.0
Percentage of DeferredVariableLeaseLiabilityChanges100.0100.0

amch:DerivativeAssetFairValueAdjustment

amch:DerivativeAssetFairValueAdjustment


Derivative
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-39.25.9-6.420-17.2-8.5-7.115
Percentage of DerivativeAssetFairValueAdjustment100.0100.0100.0100.0100.0100.0100.0100.0

amch:DerivativeAssetFairValueAdjustment us-gaap:IncomeStatementLocation, us-gaap:OptionIndexedToIssuersEquityType

us-gaap:OtherExpense, us-gaap:CallOption


Derivative
Period End2021-06-302020-09-302020-06-302020-03-312019-03-31
Value-13.714-6.4-20.1-15.1
Percentage of DerivativeAssetFairValueAdjustment0.0244.1100.0-100.0-100.0

amch:DerivativeAssetValuationImmaterialCorrectionExpense us-gaap:DebtInstrument, us-gaap:IncomeStatementLocation

amch:DerivativeAssetValuationImmaterialCorrectionExpense

amch:SeniorUnsecuredConvertibleNotesDue2024, us-gaap:OtherExpense


Derivative
Period End2020-12-312020-09-30
Value0.026
Percentage of DerivativeAssetValuationImmaterialCorrectionExpense0.0100.0

amch:DerivativeGainLossOnDerivativeNotEliminatedFromEarningsPerShareCalculation us-gaap:DebtInstrument

amch:DerivativeGainLossOnDerivativeNotEliminatedFromEarningsPerShareCalculation

amch:SeniorUnsecuredConvertibleNotesDue2024


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.50.0890.0-0.5-8.65.7-33.913
Percentage of DerivativeGainLossOnDerivativeNotEliminatedFromEarningsPerShareCalculation100.00.0100.00.0100.0100.0100.0100.0100.0

amch:DerivativeLiabilityFairValueAdjustment

amch:DerivativeLiabilityFairValueAdjustment


Derivative
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-178.8890.0-0.5385.7-33.913-120.554
Percentage of DerivativeLiabilityFairValueAdjustment100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

amch:DerivativeLiabilityFairValueAdjustment us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:EmbeddedDerivativeFinancialInstruments, us-gaap:OtherExpense


Derivative
Period End2020-12-312020-09-302020-06-302020-03-312019-03-31
Value4.784190.5-13.3
Percentage of DerivativeLiabilityFairValueAdjustment-2.693.70.0-100.0-100.0

amch:DisposalGroupIncludingDiscontinuedOperationTransactionCost

amch:DisposalGroupIncludingDiscontinuedOperationTransactionCost


Disposal
Period End2020-08-28
Value1000000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationTransactionCost100.0

amch:DisposalGroupIncludingDiscontinuedOperationTransactionCost us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, amch:ForumCinemasOu


Disposal
Period End2021-06-302021-03-312020-08-28
Value2600000.0100000.01400000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationTransactionCost0.00.0140.0

amch:DisposalGroupIncludingDiscontinuedOperationTransactionCost us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

country:LT, us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, amch:ForumCinemasOu


Disposal
Period End2021-05-31
Value300000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationTransactionCost0.0

amch:DisposalGroupNoncontrollingInterestOwnershipPercentageByNoncontrollingOwners us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

amch:DisposalGroupNoncontrollingInterestOwnershipPercentageByNoncontrollingOwners

amch:ForumCinemasOu


Disposal
Period End2021-03-31
Value49.0
Percentage of DisposalGroupNoncontrollingInterestOwnershipPercentageByNoncontrollingOwners100.0

amch:EquityInEarningsLossNonConsolidatedEntitiesExcludingInternationalTheatreJointVentures us-gaap:StatementScenario

amch:EquityInEarningsLossNonConsolidatedEntitiesExcludingInternationalTheatreJointVentures

amch:AttributableEarningsBeforeInterestTaxesDepreciationAmortization


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.3-1.2-4.4-8.7-12.2-2.16.07.49.86.0
Percentage of EquityInEarningsLossNonConsolidatedEntitiesExcludingInternationalTheatreJointVentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:EquityMethodInvestmentDistributionReductionBelowRecordedInvestment us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

amch:EquityMethodInvestmentDistributionReductionBelowRecordedInvestment

amch:DigitalCinemaImplementationPartnersLLC


Equity
Period End2020-12-31
Value0
Percentage of EquityMethodInvestmentDistributionReductionBelowRecordedInvestment0.0

amch:EstimatedCreditIncomeLossesContingentLeaseGuarantees

amch:EstimatedCreditIncomeLossesContingentLeaseGuarantees


Estimated
Period End2021-06-302021-03-312020-06-302020-03-31
Value3700000.0-2000000.0-3900000.05300000.0
Percentage of EstimatedCreditIncomeLossesContingentLeaseGuarantees100.0100.0100.0100.0

amch:EstimatedCreditIncomeLossesContingentLeaseGuarantees us-gaap:IncomeStatementLocation

us-gaap:OtherExpense


Estimated
Period End2021-06-302020-06-30
Value9200000.03900000.0
Percentage of EstimatedCreditIncomeLossesContingentLeaseGuarantees248.6-100.0

amch:EstimatedCreditIncomeLossesContingentLeaseGuarantees us-gaap:IncomeStatementLocation, us-gaap:OptionIndexedToIssuersEquityType

us-gaap:OtherExpense, us-gaap:CallOption


Estimated
Period End2021-06-302021-03-31
Value-3700000.02000000.0
Percentage of EstimatedCreditIncomeLossesContingentLeaseGuarantees-100.0-100.0

amch:ExhibitorServiceAgreement

amch:ExhibitorServiceAgreement


Exhibitor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9.49.99.910109.910.010101010101010
Percentage of ExhibitorServiceAgreement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:GainLossFromLiquidationOfSubsidiary

amch:GainLossFromLiquidationOfSubsidiary


Gain
Period End2021-06-30
Value22
Percentage of GainLossFromLiquidationOfSubsidiary100.0

amch:GainLossFromLiquidationOfSubsidiary us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Gain
Period End2021-06-30
Value0.9
Percentage of GainLossFromLiquidationOfSubsidiary3.9

us-gaap:NoncontrollingInterest


Gain
Period End2021-06-30
Value22
Percentage of GainLossFromLiquidationOfSubsidiary96.1

us-gaap:Parent


Gain
Period End2021-06-30
Value0.9
Percentage of GainLossFromLiquidationOfSubsidiary3.9

amch:GovernmentalAssistanceDueToInfrequentItems

amch:GovernmentalAssistanceDueToInfrequentItems


Governmental
Period End2021-03-31
Value12
Percentage of GovernmentalAssistanceDueToInfrequentItems100.0

amch:GovernmentalAssistanceDueToInfrequentItemsInInternationalMarkets

amch:GovernmentalAssistanceDueToInfrequentItemsInInternationalMarkets


Governmental
Period End2021-06-302020-06-30
Value424.4
Percentage of GovernmentalAssistanceDueToInfrequentItemsInInternationalMarkets100.0100.0

amch:ImpairmentLossesOfLongLivedAssetsFairValueDisclosures us-gaap:FairValueByMeasurementFrequency

amch:ImpairmentLossesOfLongLivedAssetsFairValueDisclosures

us-gaap:FairValueMeasurementsNonrecurring


Impairment
Period End2020-12-312020-03-31
Value23421859
Percentage of ImpairmentLossesOfLongLivedAssetsFairValueDisclosures100.0100.0

amch:IncomeLossFromEquityMethodInvestmentsInternationalTheatreJointVentures us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

amch:IncomeLossFromEquityMethodInvestmentsInternationalTheatreJointVentures

us-gaap:OperatingSegments, amch:InternationalMarkets


Income
Period End2020-09-302019-09-30
Value-1900000.0100000.0
Percentage of IncomeLossFromEquityMethodInvestmentsInternationalTheatreJointVentures100.0100.0

amch:IncomeLossFromEquityMethodInvestmentsInternationalTheatreJointVentures us-gaap:ConsolidationItems, us-gaap:StatementScenario, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, amch:AttributableEarningsBeforeInterestTaxesDepreciationAmortization, amch:InternationalMarkets


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-2400000.0-1600000.0-1900000.0-200000.0-800000.0100000.0400000.0500000.0
Percentage of IncomeLossFromEquityMethodInvestmentsInternationalTheatreJointVentures0.00.0100.00.00.0100.00.00.0

amch:IncreaseDecreaseInExpenseDueToFinancingFees us-gaap:IncomeStatementLocation

amch:IncreaseDecreaseInExpenseDueToFinancingFees

us-gaap:OtherExpense


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value0.01.03.0362.8
Percentage of IncreaseDecreaseInExpenseDueToFinancingFees0.0100.0100.0100.0100.0

amch:InterestExpenseNotEliminatedFromNetLossBecauseEffectWouldBeAntidilutive

amch:InterestExpenseNotEliminatedFromNetLossBecauseEffectWouldBeAntidilutive


Interest
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value8.37.88.38.38.28.08.0
Percentage of InterestExpenseNotEliminatedFromNetLossBecauseEffectWouldBeAntidilutive100.0100.0100.0100.0100.0100.0100.0

amch:InterestPaidOnExchangeOffers

amch:InterestPaidOnExchangeOffers


Interest
Period End2020-09-30
Value23
Percentage of InterestPaidOnExchangeOffers100.0

amch:InternationalGovernmentAssistanceDueToInfrequentItems

amch:InternationalGovernmentAssistanceDueToInfrequentItems


International
Period End2020-09-302020-06-30
Value134.4
Percentage of InternationalGovernmentAssistanceDueToInfrequentItems100.0100.0

amch:LandlordContributions

amch:LandlordContributions


Landlord
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value7.43.7117.08.816172429352727304256331725472968-20.309-40.122-19.507-12.726-10.991-14.33-24.693-9.201-11.294-4.131-7.159
Percentage of LandlordContributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:MergerAcquisitionTransactionCosts

amch:MergerAcquisitionTransactionCosts


Merger
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value4.36.7211.01.80.24.34.73.23.34.2184.34.75.85.61140324.9615.5484.6040.8080.7510.2611.5780.1490.0780.5720.3620.9310.2990.7060.947
Percentage of MergerAcquisitionTransactionCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:MiscellaneousExpense

amch:MiscellaneousExpense


Miscellaneous
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-30
Value0-500000.0-600000.0400000.0-200000.0-1100000.0-400000.0300000.0800000.0-200000.0
Percentage of MiscellaneousExpense0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:NetPeriodicBenefitCostCredit

amch:NetPeriodicBenefitCostCredit


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-30
Value-200000.0-200000.0800000.0200000.0100000.0400000.0300000.0400000.0700000.00100000.0-200000.0200000.0
Percentage of NetPeriodicBenefitCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

amch:NoncashInvestmentValueOfAssetsAcquired

amch:NoncashInvestmentValueOfAssetsAcquired


Noncash
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5.81.4-0.3-0.44.50.3-0.11.40.00.00.0-6.30.00.00.0235
Percentage of NoncashInvestmentValueOfAssetsAcquired100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.00.00.00.0100.0

amch:NoncontrollingInterestIncludedIncreaseFromSubsidiaryEquityIssuance

amch:NoncontrollingInterestIncludedIncreaseFromSubsidiaryEquityIssuance


Noncontrolling
Period End2021-03-31
Value-3800000.0
Percentage of NoncontrollingInterestIncludedIncreaseFromSubsidiaryEquityIssuance100.0

amch:NonoperatingIncomeExpenseIncludingIncomeLossFromEquityMethodInvestments

amch:NonoperatingIncomeExpenseIncludingIncomeLossFromEquityMethodInvestments


Nonoperating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value-52.6-146.216-225.8-95.7-122.0-90.3-75.8-50.7-90.883-67.4-70.1-87.5-56.3-56.0-266.5-56.2-20.094-15.003-15.252-12.87-10.36-14.281-26.9-21.985-19.033-16.428-16.893
Percentage of NonoperatingIncomeExpenseIncludingIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:OperatingExpensesIncomeRelatedParty us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

amch:OperatingExpensesIncomeRelatedParty

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Operating
Period End2021-06-302021-03-312020-06-302020-03-31
Value-300000.0400000.0-400000.01300000.0
Percentage of OperatingExpensesIncomeRelatedParty100.0100.0100.0100.0

amch:OperatingLeaseCommitmentsNotYetCommenced

amch:OperatingLeaseCommitmentsNotYetCommenced


Operating
Period End2021-06-302021-03-312020-12-31
Value6.615018
Percentage of OperatingLeaseCommitmentsNotYetCommenced100.0100.0100.0

amch:OperatingLeaseLandlordContributions

amch:OperatingLeaseLandlordContributions


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value7.43.7117.08.81617242935
Percentage of OperatingLeaseLandlordContributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:OperatingLeaseNonCashExpensesBenefits

amch:OperatingLeaseNonCashExpensesBenefits


Operating
Period End2021-06-302021-03-312020-06-302020-03-31
Value-11700000.0-7500000.0-3800000.02300000.0
Percentage of OperatingLeaseNonCashExpensesBenefits100.0100.0100.0100.0

amch:OperatingLeaseNonCashPayments

amch:OperatingLeaseNonCashPayments


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-3.2-0.2-3.82.36.26.15.87.6
Percentage of OperatingLeaseNonCashPayments100.0100.0100.0100.0100.0100.0100.0100.0

amch:OtherNonoperatingIncomeExpenseExcludingMergerCosts

amch:OtherNonoperatingIncomeExpenseExcludingMergerCosts


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-0.3-4.8-96.6138-1.926-17.9-1.5-23.829-165.9542.51.20.5-0.61.0-2.20.1-0.1
Percentage of OtherNonoperatingIncomeExpenseExcludingMergerCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:OtherNonoperatingIncomeExpenseExcludingMergerCosts us-gaap:StatementScenario

amch:AttributableEarningsBeforeInterestTaxesDepreciationAmortization


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.10.10.30.10.10.20.20.3
Percentage of OtherNonoperatingIncomeExpenseExcludingMergerCosts-33.3-2.1-0.30.1-5.30.7-1.1-20.0

amch:OtherOperatingLeaseCost us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType

amch:OtherOperatingLeaseCost

us-gaap:OperatingExpense, amch:Theatres


Other
Period End2021-06-30
Value-700000.0
Percentage of OtherOperatingLeaseCost100.0

amch:OtherVariableLeaseCost us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType

amch:OtherVariableLeaseCost

us-gaap:OperatingExpense, us-gaap:Equipment


Other
Period End2021-03-312020-09-302020-06-30
Value200000.0100000.0-500000.0
Percentage of OtherVariableLeaseCost100.0100.0100.0

amch:PercentOfPerformanceTarget us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

amch:PercentOfPerformanceTarget

us-gaap:PerformanceShares


Percent
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value100.099.01.01.099.01.01.0
Percentage of PercentOfPerformanceTarget100.0100.0100.0100.0100.0100.0100.0

amch:PercentageOfDifferenceBetweenPresentValueOfOldAndNewCashFlows us-gaap:CreditFacility

amch:PercentageOfDifferenceBetweenPresentValueOfOldAndNewCashFlows

amch:SecondLienNotesDue2026


Percentage
Period End2020-07-31
Value10.0
Percentage of PercentageOfDifferenceBetweenPresentValueOfOldAndNewCashFlows100.0

amch:PercentageOfDifferenceBetweenPresentValueOfOldAndNewCashFlows us-gaap:DebtInstrument

amch:ConvertibleNotesDue2026


Percentage
Period End2020-07-31
Value10.0
Percentage of PercentageOfDifferenceBetweenPresentValueOfOldAndNewCashFlows100.0

amch:PercentageOfOutstandingExistingSubordinatedNotesValidlyTendered us-gaap:DebtInstrument

amch:PercentageOfOutstandingExistingSubordinatedNotesValidlyTendered

amch:SeniorSubordinatedNotes5.75Due2025


Percentage
Period End2020-07-31
Value83.61
Percentage of PercentageOfOutstandingExistingSubordinatedNotesValidlyTendered100.0

amch:SeniorSubordinatedNotes5.875Due2026


Percentage
Period End2020-07-31
Value90.65
Percentage of PercentageOfOutstandingExistingSubordinatedNotesValidlyTendered108.4

amch:SeniorSubordinatedNotes6.125Due2027


Percentage
Period End2020-07-31
Value72.48
Percentage of PercentageOfOutstandingExistingSubordinatedNotesValidlyTendered86.7

amch:SeniorSubordinatedNotes6.375Due2024


Percentage
Period End2020-07-31
Value99.2
Percentage of PercentageOfOutstandingExistingSubordinatedNotesValidlyTendered118.6

amch:PercentageOfOutstandingSharesOfEntity us-gaap:CreditFacility, us-gaap:StatementClassOfStock

amch:PercentageOfOutstandingSharesOfEntity

amch:FirstLienNotesDue2026, us-gaap:CommonClassA


Percentage
Period End2020-07-31
Value4.6
Percentage of PercentageOfOutstandingSharesOfEntity100.0

amch:PercentageOfPerformanceStockUnitAwardVestingAsPercentageOfPerformanceTarget us-gaap:Range, us-gaap:AwardType, us-gaap:GranteeStatus

amch:PercentageOfPerformanceStockUnitAwardVestingAsPercentageOfPerformanceTarget

srt:Maximum, us-gaap:PerformanceShares, amch:ManagementAndExecutiveOfficers


Percentage
Period End2021-06-302021-03-31
Value0120.0
Percentage of PercentageOfPerformanceStockUnitAwardVestingAsPercentageOfPerformanceTarget0.0100.0

srt:Minimum, us-gaap:PerformanceShares, amch:ManagementAndExecutiveOfficers


Percentage
Period End2021-06-302021-03-31
Value080.0
Percentage of PercentageOfPerformanceStockUnitAwardVestingAsPercentageOfPerformanceTarget0.066.7

amch:PercentageOfPerformanceTargetForGrantOfPerformanceStockUnitAward us-gaap:Range, us-gaap:AwardType, us-gaap:GranteeStatus

amch:PercentageOfPerformanceTargetForGrantOfPerformanceStockUnitAward

srt:Maximum, us-gaap:PerformanceShares, amch:ManagementAndExecutiveOfficers


Percentage
Period End2021-06-302021-03-31
Value0200.0
Percentage of PercentageOfPerformanceTargetForGrantOfPerformanceStockUnitAward0.0100.0

srt:Minimum, us-gaap:PerformanceShares, amch:ManagementAndExecutiveOfficers


Percentage
Period End2021-06-302021-03-31
Value050.0
Percentage of PercentageOfPerformanceTargetForGrantOfPerformanceStockUnitAward0.025.0

amch:PercentageOfSalaryReduction us-gaap:Range, us-gaap:UnusualOrInfrequentItem

amch:PercentageOfSalaryReduction

srt:Maximum, amch:Covid19


Percentage
Period End2021-03-312020-12-312020-09-302020-06-302020-03-31
Value100.0099.001.0
Percentage of PercentageOfSalaryReduction100.00.0100.00.0100.0

srt:Minimum, amch:Covid19


Percentage
Period End2021-03-312020-12-312020-09-302020-06-302020-03-31
Value20.0019.800.2
Percentage of PercentageOfSalaryReduction20.00.020.00.020.0

amch:PercentageOfTheatresReopened us-gaap:StatementGeographical

amch:PercentageOfTheatresReopened

amch:InternationalMarkets


Percentage
Period End2021-06-302021-03-312021-01-01
Value68.027.030.0
Percentage of PercentageOfTheatresReopened100.0100.0100.0

country:US


Percentage
Period End2021-06-302021-03-312021-01-01
Value1.099.067.0
Percentage of PercentageOfTheatresReopened1.5366.7223.3

amch:ReclassificationOfCommitmentFeeAndDeferredCharges us-gaap:CreditFacility, us-gaap:StatementClassOfStock

amch:ReclassificationOfCommitmentFeeAndDeferredCharges

amch:FirstLienSecuredNotesDue2026, us-gaap:CommonClassA


Reclassification
Period End2021-06-302021-03-31
Value0.028
Percentage of ReclassificationOfCommitmentFeeAndDeferredCharges0.0100.0

amch:ReclassificationOfDerivativeLiabilityToAdditionalPaidInCapital us-gaap:DebtInstrument

amch:ReclassificationOfDerivativeLiabilityToAdditionalPaidInCapital

amch:SeniorUnsecuredConvertibleNotesDue2024


Reclassification
Period End2020-12-31
Value0.0
Percentage of ReclassificationOfDerivativeLiabilityToAdditionalPaidInCapital0.0

amch:RelatedPartyReimbursements dei:LegalEntity

amch:RelatedPartyReimbursements

amch:DalianWandaGroupLtd


Related
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value000100000.0100000.0100000.0
Percentage of RelatedPartyReimbursements0.00.00.0100.0100.0100.0

amch:RelatedPartyReimbursements us-gaap:RelatedPartyTransactionsByRelatedParty

amch:DalianWandaGroupLtd


Related
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value100000.00100000.0100000.0200000.00100000.0100000.0
Percentage of RelatedPartyReimbursements0.00.0100.0100.00.00.00.00.0

amch:RelatedPartyTransactionExpensesFromTransactions us-gaap:IncomeStatementLocation, us-gaap:RelatedPartyTransactionsByRelatedParty

amch:RelatedPartyTransactionExpensesFromTransactions

us-gaap:CostOfSales, amch:ACJVLLC


Related
Period End2020-09-30
Value100000.0
Percentage of RelatedPartyTransactionExpensesFromTransactions100.0

us-gaap:OperatingExpense, amch:DigitalCinemaImplementationPartnersLLC


Related
Period End2020-09-30
Value-300000.0
Percentage of RelatedPartyTransactionExpensesFromTransactions-300.0

amch:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingLevelInPeriodCovid19Percent us-gaap:AwardType

amch:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingLevelInPeriodCovid19Percent

us-gaap:PerformanceShares


Share
Period End2020-10-30
Value90.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingLevelInPeriodCovid19Percent100.0

amch:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateIncrementalFairValue us-gaap:AwardType

amch:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateIncrementalFairValue

amch:SpecialPerformanceStockUnitAward


Share
Period End2020-10-30
Value7300000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateIncrementalFairValue100.0

amch:ShareBasedCompensationCashPortion

amch:ShareBasedCompensationCashPortion


Share
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-34.93.1-3.7-2.7-15.92.15.44.04.04.24.02.81.8-0.13.90.12.3431.71.71.1
Percentage of ShareBasedCompensationCashPortion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:StockIssuedDuringPeriodSharesCommitmentShares us-gaap:CounterpartyName, us-gaap:StatementClassOfStock

amch:StockIssuedDuringPeriodSharesCommitmentShares

amch:MudrickCapitalManagementLp, us-gaap:CommonClassA


Stock
Period End2020-12-14
Value8241800.0
Percentage of StockIssuedDuringPeriodSharesCommitmentShares100.0

amch:StockIssuedDuringPeriodValueCommitmentShares us-gaap:CounterpartyName, us-gaap:StatementClassOfStock

amch:StockIssuedDuringPeriodValueCommitmentShares

amch:MudrickCapitalManagementLp, us-gaap:CommonClassA


Stock
Period End2020-12-14
Value70
Percentage of StockIssuedDuringPeriodValueCommitmentShares100.0

amch:TangibleAssetImpairmentNumberOfScreens us-gaap:StatementBusinessSegments

amch:TangibleAssetImpairmentNumberOfScreens

amch:UsMarkets


Tangible
Period End2021-06-302020-06-302020-03-31
Value658.00658.0
Percentage of TangibleAssetImpairmentNumberOfScreens100.00.0100.0

amch:TangibleAssetImpairmentNumberOfTheatres us-gaap:StatementBusinessSegments

amch:TangibleAssetImpairmentNumberOfTheatres

amch:UsMarkets


Tangible
Period End2021-06-302020-06-302020-03-31
Value57.0057.0
Percentage of TangibleAssetImpairmentNumberOfTheatres100.00.0100.0

amch:TheatreAttendancePercentageNeededToMaintainOperation

amch:TheatreAttendancePercentageNeededToMaintainOperation


Theatre
Period End2021-03-31
Value85.0
Percentage of TheatreAttendancePercentageNeededToMaintainOperation100.0

amch:TheatreLeftToReopenPercentage us-gaap:StatementGeographical, us-gaap:SubsequentEventType

amch:TheatreLeftToReopenPercentage

country:US, us-gaap:SubsequentEvent


Theatre
Period End2020-10-16
Value10.0
Percentage of TheatreLeftToReopenPercentage100.0

amch:TheatreScreensOperatedPercentageDeclineFromPreviousYear

amch:TheatreScreensOperatedPercentageDeclineFromPreviousYear


Theatre
Period End2021-03-31
Value24.2
Percentage of TheatreScreensOperatedPercentageDeclineFromPreviousYear100.0

amch:ThirdPartyCosts

amch:ThirdPartyCosts


Third
Period End2020-09-30
Value39
Percentage of ThirdPartyCosts100.0

amch:TotalDeferredLeaseAmountsChanges

amch:TotalDeferredLeaseAmountsChanges


Total
Period End2021-06-302021-03-31
Value-52.423
Percentage of TotalDeferredLeaseAmountsChanges100.0100.0

amch:ValueOfSharesIssuedStockBasedCompensation

amch:ValueOfSharesIssuedStockBasedCompensation


Value
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value3100000.03700000.02700000.02100000.05400000.04000000.04200000.04000000.02800000.0-300000.03000000.0-400000.0
Percentage of ValueOfSharesIssuedStockBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:ValueOfSharesIssuedStockBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Value
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value3100000.03700000.02700000.02100000.05400000.04000000.04200000.04000000.02800000.0-300000.03000000.0-400000.0
Percentage of ValueOfSharesIssuedStockBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Parent


Value
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value3100000.03700000.02700000.02100000.05400000.04000000.0
Percentage of ValueOfSharesIssuedStockBasedCompensation100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature

us-gaap:AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature


Adjustments
Period End2020-09-30
Value74
Percentage of AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2020-09-30
Value89
Percentage of AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature121.5

us-gaap:Parent


Adjustments
Period End2020-09-30
Value74
Percentage of AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature100.0

us-gaap:RetainedEarnings


Adjustments
Period End2020-09-30
Value-15.9
Percentage of AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature-21.5

us-gaap:AmortizationOfDebtDiscountPremium

us-gaap:AmortizationOfDebtDiscountPremium


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-17.842-17.8-10.83.53.13.23.12.82.22.3-0.4-0.8-0.9-0.8-0.8-0.8-0.30.0270.0580.0570.0590.1340.0142.226-1.5661.622-1.5282.13-1.392
Percentage of AmortizationOfDebtDiscountPremium100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfDebtDiscountPremium us-gaap:CreditFacility

amch:FirstLienNotesDue2026


Amortization
Period End2020-12-31
Value0.0
Percentage of AmortizationOfDebtDiscountPremium-0.0

amch:SecondLienNotesDue2026


Amortization
Period End2020-07-31
Value535
Percentage of AmortizationOfDebtDiscountPremium0.0

us-gaap:AmortizationOfDebtDiscountPremium us-gaap:DebtInstrument

amch:FourHundredMillionTermLoanFacility


Amortization
Period End2021-06-302021-03-31
Value0.019
Percentage of AmortizationOfDebtDiscountPremium-0.045.2

amch:New10.500SeniorSecuredNotesDue2026


Amortization
Period End2020-09-30
Value30
Percentage of AmortizationOfDebtDiscountPremium-277.8

us-gaap:ConvertibleNotesPayable


Amortization
Period End2020-12-31
Value2.5
Percentage of AmortizationOfDebtDiscountPremium-14.0

us-gaap:AssetImpairmentCharges

us-gaap:AssetImpairmentCharges


Asset
Period End2020-12-312020-09-302020-06-302020-03-312018-03-312017-12-312017-09-30
Value4661950.01851163.60.0
Percentage of AssetImpairmentCharges100.0100.00.0100.0100.0100.00.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:ContractWithCustomerLiabilityRevenueRecognized


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value8.121-11.5-17.77.518171511182016253917
Percentage of ContractWithCustomerLiabilityRevenueRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized us-gaap:ProductOrService

amch:TotalOtherProductAndService


Contract
Period End2020-09-302020-06-302020-03-31
Value-1.30.0-0.2
Percentage of ContractWithCustomerLiabilityRevenueRecognized7.30.0-1.1

us-gaap:Admission


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value2.00.51.62.00.04.8
Percentage of ContractWithCustomerLiabilityRevenueRecognized24.72.3-13.9-11.30.026.2

us-gaap:FoodAndBeverage


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value3.90.81.60.90.012
Percentage of ContractWithCustomerLiabilityRevenueRecognized48.13.7-13.9-5.10.068.3

us-gaap:ConversionOfStockSharesIssued1 us-gaap:CounterpartyName, us-gaap:CreditFacility

us-gaap:ConversionOfStockSharesIssued1

amch:MudrickCapitalManagementLp, amch:SecondLienNotesDue2026


Conversion
Period End2020-12-14
Value13
Percentage of ConversionOfStockSharesIssued1100.0

us-gaap:DebtConversionConvertedInstrumentAmount1 us-gaap:DebtInstrument

us-gaap:DebtConversionConvertedInstrumentAmount1

amch:SeniorUnsecuredConvertibleNotesDue2024


Debt
Period End2020-07-31
Value600
Percentage of DebtConversionConvertedInstrumentAmount1100.0

amch:SeniorUnsecuredConvertibleNotesDue2026


Debt
Period End2021-01-31
Value600
Percentage of DebtConversionConvertedInstrumentAmount10.0

us-gaap:SeniorSubordinatedNotes


Debt
Period End2020-07-31
Value2020
Percentage of DebtConversionConvertedInstrumentAmount1336.7

us-gaap:DebtConversionConvertedInstrumentAmount1 us-gaap:DebtInstrument, us-gaap:StatementClassOfStock

amch:ConvertibleNotesDue2026, us-gaap:CommonClassA


Debt
Period End2020-09-14
Value600
Percentage of DebtConversionConvertedInstrumentAmount10.0

amch:SecondLienNotesDue2026, us-gaap:CommonClassA


Debt
Period End2020-12-31
Value104
Percentage of DebtConversionConvertedInstrumentAmount10.0

us-gaap:DebtConversionConvertedInstrumentAmount1 us-gaap:DebtInstrument, us-gaap:SubsequentEventType

amch:ConvertibleNotesDue2026, us-gaap:SubsequentEvent


Debt
Period End2021-01-27
Value600
Percentage of DebtConversionConvertedInstrumentAmount10.0

us-gaap:DebtConversionConvertedInstrumentSharesIssued1 us-gaap:DebtInstrument, us-gaap:StatementClassOfStock

us-gaap:DebtConversionConvertedInstrumentSharesIssued1

amch:SecondLienNotesDue2026, us-gaap:CommonClassA


Debt
Period End2020-12-31
Value21
Percentage of DebtConversionConvertedInstrumentSharesIssued1100.0

amch:SeniorUnsecuredConvertibleNotesDue2026, us-gaap:CommonClassA


Debt
Period End2021-01-31
Value44
Percentage of DebtConversionConvertedInstrumentSharesIssued10.0

us-gaap:DebtConversionConvertedInstrumentSharesIssued1 us-gaap:DebtInstrument, us-gaap:SubsequentEventType

amch:ConvertibleNotesDue2026, us-gaap:SubsequentEvent


Debt
Period End2021-01-27
Value44
Percentage of DebtConversionConvertedInstrumentSharesIssued10.0

us-gaap:DebtConversionOriginalDebtAmount1 us-gaap:CounterpartyName, us-gaap:CreditFacility

us-gaap:DebtConversionOriginalDebtAmount1

amch:MudrickCapitalManagementLp, amch:SecondLienNotesDue2026


Debt
Period End2020-12-14
Value104
Percentage of DebtConversionOriginalDebtAmount1100.0

us-gaap:DebtConversionOriginalDebtAmount1 us-gaap:CounterpartyName, us-gaap:CreditFacility, us-gaap:StatementClassOfStock

amch:MudrickCapitalManagementLp, amch:SecondLienNotesDue2026, us-gaap:CommonClassA


Debt
Period End2020-12-14
Value100
Percentage of DebtConversionOriginalDebtAmount195.7

us-gaap:DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal us-gaap:DebtInstrument

us-gaap:DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal

amch:SeniorUnsecuredConvertibleNotesDue2024


Debt
Period End2020-12-31
Value115
Percentage of DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal100.0

us-gaap:DebtInstrumentIncreaseDecreaseForPeriodNet us-gaap:DebtInstrument

us-gaap:DebtInstrumentIncreaseDecreaseForPeriodNet

us-gaap:SeniorSubordinatedNotes


Debt
Period End2020-07-31
Value555
Percentage of DebtInstrumentIncreaseDecreaseForPeriodNet100.0

us-gaap:DebtInstrumentPeriodicPaymentInterest us-gaap:DebtInstrument, us-gaap:StatementClassOfStock

us-gaap:DebtInstrumentPeriodicPaymentInterest

amch:SeniorUnsecuredConvertibleNotesDue2026, us-gaap:CommonClassA


Debt
Period End2021-01-31
Value17
Percentage of DebtInstrumentPeriodicPaymentInterest100.0

us-gaap:DebtInstrumentRedemptionPricePercentage us-gaap:CreditFacility

us-gaap:DebtInstrumentRedemptionPricePercentage

amch:FirstLienNotesDue2026


Debt
Period End2020-07-31
Value100.0
Percentage of DebtInstrumentRedemptionPricePercentage100.0

amch:SecondLienNotesDue2026


Debt
Period End2020-07-31
Value101.0
Percentage of DebtInstrumentRedemptionPricePercentage101.0

us-gaap:DebtInstrumentRedemptionPricePercentage us-gaap:CreditFacility, us-gaap:DebtInstrumentRedemptionPeriod

amch:SecondLienNotesDue2026, amch:DebtRedemptionAtTimeOfSaleOfAssets


Debt
Period End2020-07-31
Value100.0
Percentage of DebtInstrumentRedemptionPricePercentage100.0

us-gaap:DebtInstrumentRedemptionPricePercentage us-gaap:Range, us-gaap:CreditFacility

srt:Maximum, amch:FirstLienNotesDue2026


Debt
Period End2020-07-31
Value35.0
Percentage of DebtInstrumentRedemptionPricePercentage35.0

us-gaap:DebtInstrumentRedemptionPricePercentage us-gaap:StatementScenario, us-gaap:CreditFacility

amch:ScenarioOne, amch:FirstLienNotesDue2026


Debt
Period End2020-07-31
Value100.0
Percentage of DebtInstrumentRedemptionPricePercentage100.0

amch:ScenarioTwo, amch:FirstLienNotesDue2026


Debt
Period End2020-07-31
Value101.0
Percentage of DebtInstrumentRedemptionPricePercentage101.0

us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed us-gaap:CreditFacility

us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed

amch:FirstLienNotesDue2026


Debt
Period End2020-07-31
Value110.5
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed100.0

amch:SecondLienNotesDue2026


Debt
Period End2020-07-31
Value100.0
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed90.5

us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed us-gaap:CreditFacility, us-gaap:DebtInstrumentRedemptionPeriod

amch:FirstLienNotesDue2026, amch:DebtInstrumentRedemptionPeriodEight


Debt
Period End2020-07-31
Value100.0
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed90.5

amch:FirstLienNotesDue2026, amch:DebtInstrumentRedemptionPeriodSix


Debt
Period End2020-07-31
Value102.62
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed92.9

amch:FirstLienNotesDue2026, us-gaap:DebtInstrumentRedemptionPeriodFive


Debt
Period End2020-07-31
Value105.25
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed95.2

amch:FirstLienNotesDue2026, us-gaap:DebtInstrumentRedemptionPeriodThree


Debt
Period End2020-07-31
Value100.0
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed90.5

amch:SecondLienNotesDue2026, amch:DebtInstrumentRedemptionPeriodEight


Debt
Period End2020-07-31
Value100.0
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed90.5

amch:SecondLienNotesDue2026, amch:DebtInstrumentRedemptionPeriodSeven


Debt
Period End2020-07-31
Value103.0
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed93.2

amch:SecondLienNotesDue2026, amch:DebtInstrumentRedemptionPeriodSix


Debt
Period End2020-07-31
Value106.0
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed95.9

us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed us-gaap:DebtInstrument

us-gaap:SeniorSubordinatedNotes


Debt
Period End2020-07-31
Value23.9
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed21.6

us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:SeniorSubordinatedNotes, us-gaap:SubsequentEvent


Debt
Period End2020-07-31
Value0.241
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed0.2

us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed us-gaap:DebtInstrumentRedemptionPeriod

amch:DebtInstrumentRedemptionPeriodEight


Debt
Period End2020-07-31
Value100.0
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed90.5

amch:DebtInstrumentRedemptionPeriodSix


Debt
Period End2020-07-31
Value102.62
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed92.9

us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed us-gaap:StatementScenario, us-gaap:CreditFacility

amch:ScenarioOne, amch:FirstLienNotesDue2026


Debt
Period End2020-07-31
Value100.0
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed90.5

amch:ScenarioTwo, amch:FirstLienNotesDue2026


Debt
Period End2020-07-31
Value101.0
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed91.4

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-200000.0-200000.01000000.0200000.0300000.0300000.0400000.0700000.0500000.0100000.0600000.0400000.0-100000.0200000.00300000.0200000.0100000.0133000.0199000.0199000.0199000.0-119000.0-86000.0-86000.0-17917000.0-854000.0-855000.0-854000.0-855000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:DerivativeGainLossOnDerivativeNet


Derivative
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.0-122.232-19.6-21.22815-28.4-57.3
Percentage of DerivativeGainLossOnDerivativeNet0.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents


Effect
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value5.6-5.12.52.81.1-6.73.8-1.7-2.82.2-2.3-14.65.46.0-1.06.49.02.70.665-0.047-0.0760.013-0.042-0.282-0.0970.058-0.0130.0090.018-0.009-0.0280.0-0.027-0.048
Percentage of EffectOfExchangeRateOnCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:EquityMethodInvestmentDividendsOrDistributions

us-gaap:EquityMethodInvestmentDividendsOrDistributions


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.00.30.03.76.17.6184.71.8104.33.13.524126.52.224183.40.617
Percentage of EquityMethodInvestmentDividendsOrDistributions0.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentOtherThanTemporaryImpairment

us-gaap:EquityMethodInvestmentOtherThanTemporaryImpairment


Equity
Period End2020-12-312020-09-302020-06-302020-03-312017-12-292017-06-30
Value1.40.00.07.23.5204
Percentage of EquityMethodInvestmentOtherThanTemporaryImpairment100.00.00.0100.0100.0100.0

us-gaap:EquityMethodInvestmentOtherThanTemporaryImpairment us-gaap:IncomeStatementLocation

amch:InvestmentIncomeExpenseNetCaption


Equity
Period End2020-09-302020-06-302020-03-31
Value0.00.07.2
Percentage of EquityMethodInvestmentOtherThanTemporaryImpairment0.00.0100.0

us-gaap:EquityMethodInvestmentOtherThanTemporaryImpairment us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

amch:DigitalCinemaImplementationPartnersLLC


Equity
Period End2020-12-31
Value125
Percentage of EquityMethodInvestmentOtherThanTemporaryImpairment8942.9

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPeriodIncreaseDecrease us-gaap:DebtInstrument

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPeriodIncreaseDecrease

amch:SeniorUnsecuredConvertibleNotesDue2024


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.0890.0-0.5385.7-33.9-13.3
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPeriodIncreaseDecrease0.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ConvertibleNotesPayable


Fair
Period End2020-12-31
Value178
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPeriodIncreaseDecrease0.0

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeaseInterestExpense


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.41.41.41.41.51.61.61.82.12.1
Percentage of FinanceLeaseInterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseInterestExpense us-gaap:IncomeStatementLocation

us-gaap:InterestExpense


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.41.41.41.41.51.61.61.82.12.1
Percentage of FinanceLeaseInterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseInterestPaymentOnLiability

us-gaap:FinanceLeaseInterestPaymentOnLiability


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value200000.01000000.01400000.0-1300000.01500000.01600000.01600000.01800000.02100000.02100000.0
Percentage of FinanceLeaseInterestPaymentOnLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeasePrincipalPayments

us-gaap:FinanceLeasePrincipalPayments


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.01.91.72.20.02.32.42.42.33.8
Percentage of FinanceLeasePrincipalPayments100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseRightOfUseAssetAmortization us-gaap:IncomeStatementLocation

us-gaap:FinanceLeaseRightOfUseAssetAmortization

amch:DepreciationAndAmortizationExpense


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1300000.01300000.01500000.01600000.01700000.01900000.01900000.02100000.02500000.02700000.0
Percentage of FinanceLeaseRightOfUseAssetAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossRealized

us-gaap:ForeignCurrencyTransactionGainLossRealized


Foreign
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-3400000.03800000.0-100000.02100000.0-2000000.0-800000.0-100000.0-100000.0-500000.0-300000.0-100000.0-1000000.0-1200000.0-200000.0500000.0
Percentage of ForeignCurrencyTransactionGainLossRealized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossRealized us-gaap:IncomeStatementLocation

us-gaap:OtherExpense


Foreign
Period End2021-06-302021-03-312020-06-302020-03-312019-03-31
Value3400000.03800000.0-2100000.02000000.0500000.0
Percentage of ForeignCurrencyTransactionGainLossRealized-100.0100.0-100.0-100.0-100.0

us-gaap:GainLossOnDispositionOfAssets

us-gaap:GainLossOnDispositionOfAssets


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value140.91.41.01.40.03.1120.30.11.61.2-2.00.93.40.2-0.258-0.3670.0253.00.00.00.23-0.0690.0090.46-1.669-0.22-0.2264.991
Percentage of GainLossOnDispositionOfAssets100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainsLossesOnRestructuringOfDebt

us-gaap:GainsLossesOnRestructuringOfDebt


Gains
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-06-302018-12-312018-09-30
Value0.0-1.0-0.2-36.3-2.816-0.80.4
Percentage of GainsLossesOnRestructuringOfDebt0.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss

us-gaap:GoodwillForeignCurrencyTranslationGainLoss


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-18.752-86.17050-106.8
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss us-gaap:ReportingUnit

amch:InternationalTheatres


Goodwill
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value-18.7527050-106.8
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0

us-gaap:GoodwillImpairmentLoss

us-gaap:GoodwillImpairmentLoss


Goodwill
Period End2020-12-312020-09-302020-06-302020-03-312019-09-30
Value4051560.017440.0
Percentage of GoodwillImpairmentLoss100.0100.00.0100.00.0

us-gaap:GoodwillImpairmentLoss us-gaap:ReportingUnit

amch:DomesticTheatres


Goodwill
Period End2021-06-302020-12-312020-09-302020-06-302020-03-31
Value11240.01510.01124
Percentage of GoodwillImpairmentLoss0.00.096.40.064.5

amch:InternationalTheatres


Goodwill
Period End2021-06-302020-12-312020-09-302020-06-302020-03-31
Value6194055.60.0619
Percentage of GoodwillImpairmentLoss0.0100.03.60.035.5

us-gaap:GoodwillImpairmentLoss us-gaap:StatementGeographical

country:US


Goodwill
Period End2020-09-302020-03-31
Value1511124
Percentage of GoodwillImpairmentLoss96.464.5

us-gaap:NonUs


Goodwill
Period End2020-12-312020-09-302020-03-31
Value4055.6619
Percentage of GoodwillImpairmentLoss100.03.635.5

us-gaap:GoodwillWrittenOffRelatedToSaleOfBusinessUnit

us-gaap:GoodwillWrittenOffRelatedToSaleOfBusinessUnit


Goodwill
Period End2021-03-31
Value3.7
Percentage of GoodwillWrittenOffRelatedToSaleOfBusinessUnit100.0

us-gaap:GoodwillWrittenOffRelatedToSaleOfBusinessUnit us-gaap:ReportingUnit

amch:InternationalTheatres


Goodwill
Period End2021-03-31
Value3.7
Percentage of GoodwillWrittenOffRelatedToSaleOfBusinessUnit100.0

us-gaap:ImpairmentOfIntangibleAssetsFinitelived

us-gaap:ImpairmentOfIntangibleAssetsFinitelived


Impairment
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.06.40.08.0
Percentage of ImpairmentOfIntangibleAssetsFinitelived0.0100.00.0100.0

us-gaap:ImpairmentOfIntangibleAssetsFinitelived us-gaap:ReportingUnit

amch:DomesticTheatres


Impairment
Period End2021-06-302020-12-312020-09-302020-03-31
Value8.00.06.48.0
Percentage of ImpairmentOfIntangibleAssetsFinitelived0.00.0100.0100.0

us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill

us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill


Impairment
Period End2020-12-312020-09-302020-06-302020-03-31
Value2.34.60.08.3
Percentage of ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill100.0100.00.0100.0

us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

amch:NordicTradeNames


Impairment
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.20.10.02.4
Percentage of ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill8.72.20.028.9

amch:OdenTradeNames


Impairment
Period End2020-12-312020-09-302020-06-302020-03-31
Value2.14.50.05.9
Percentage of ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill91.397.80.071.1

us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass, us-gaap:ReportingUnit

amch:NordicTradeNames, amch:InternationalTheatres


Impairment
Period End2020-09-30
Value0.1
Percentage of ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill2.2

amch:OdenTradeNames, amch:InternationalTheatres


Impairment
Period End2020-09-30
Value4.5
Percentage of ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill97.8

us-gaap:ImpairmentOfLongLivedAssetsHeldForUse

us-gaap:ImpairmentOfLongLivedAssetsHeldForUse


Impairment
Period End2020-12-312020-09-302020-06-302020-03-312018-12-312014-12-31
Value58280.091133.149
Percentage of ImpairmentOfLongLivedAssetsHeldForUse100.0100.00.0100.0100.0100.0

us-gaap:ImpairmentOfLongLivedAssetsHeldForUse us-gaap:StatementBusinessSegments

amch:InternationalMarkets


Impairment
Period End2020-12-312020-09-302020-06-302020-03-31
Value150.00.09.9
Percentage of ImpairmentOfLongLivedAssetsHeldForUse26.50.00.010.8

amch:UsMarkets


Impairment
Period End2021-06-302020-12-312020-09-302020-06-302020-03-31
Value8143280.081
Percentage of ImpairmentOfLongLivedAssetsHeldForUse0.073.5100.00.089.2

us-gaap:ImpairmentOfLongLivedAssetsHeldForUse us-gaap:StatementGeographical

country:US


Impairment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value43280.08184
Percentage of ImpairmentOfLongLivedAssetsHeldForUse73.5100.00.089.20.0

us-gaap:NonUs


Impairment
Period End2020-12-312020-09-302020-06-302020-03-31
Value150.00.09.9
Percentage of ImpairmentOfLongLivedAssetsHeldForUse26.50.00.010.8

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-2.7-2.8-5.0-10.6-12.4-2.96.47.5106.5127013-9.013-1.8-195.0-2.31912114.26415109.3621.3249.315139.597-5.3849.29214230.546
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value2.72.8122.9
Percentage of IncomeLossFromEquityMethodInvestments-100.0-100.0-100.0-100.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

amch:DigitalCinemaImplementationPartnersLLC


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value33-7.5-9.7-1.94.36.59.05.68.27.46.86.67.46.07.87.46.8817.9446.8585.7647.6786.2535.1625.4295.8475.5375.8983.6475.6745.1594.0453.782
Percentage of IncomeLossFromEquityMethodInvestments-672.070.878.265.567.286.788.286.264.610.652.3-73.353.2-333.3-4.0-321.735.266.057.9135.249.257.655.1410.062.842.361.5-67.761.136.017.4692.7

amch:OtherEquityMethodInvestmentInvestee


Income
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-3.1-2.7-1.02.11.01.20.9343.60.41.9-2.02.4-4.3-3.71.4890.6290.2020.3580.1160.4090.160.210.1040.350.2140.1690.1280.3460.383-0.139
Percentage of IncomeLossFromEquityMethodInvestments29.221.834.532.813.311.813.8270.95.13.1-21.1-14.4-133.32.2160.97.65.21.78.40.73.81.715.91.12.72.2-3.11.42.41.6-25.5

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:StatementScenario

amch:AttributableEarningsBeforeInterestTaxesDepreciationAmortization


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-2.7-2.8-10.6-12.4-2.97.5106.5
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-2.7-2.8-5.1-10.7-18.4-11.2-12.92.47.6375.9-11.33.8147.3-21.21.7668.62911-6.1997.0422.2948.077-7.81-1.4857.9477.805-14.165-1.4096.10320-5.828
Percentage of IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value2096851166.4-105.754
Percentage of IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-2.013-9.5-17.7-20.4-29.2-34.121-4.1-14.59.3-15.63.43.3-21.9-4.6-2.51029-3.3351.3421.693.04-8.8316.3492.2774.336-1.839-0.4592.2446.87-3.4192.9662.498
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-9.02.76.012-47.9-129.493-61.836-68.3117-34.831-114.0141-26.119-97.8108-13.2125.476-43.98753-19.36219-52.94361-15.467-0.901-45.24159-27.44412-41.325
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaid

us-gaap:InterestPaid


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value7226557671341003710838103361023565348739371628222722332035214115
Percentage of InterestPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaidCapitalized

us-gaap:InterestPaidCapitalized


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0200000.0300000.0300000.0200000.0300000.0400000.0200000.0100000.0300000.0100000.0100000.0200000.0100000.0100000.0200000.0100000.0100000.092000.0100000.0100000.046000.081000.035000.050000.037000.084000.060000.094000.077000.073000.0165000.0
Percentage of InterestPaidCapitalized0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeNet

us-gaap:InvestmentIncomeNet


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value6.32.0-6.14.11.3-9.4-2.70.52.116-1.20.71.55.21.016-0.65.30.552-0.176-0.210.01.076-0.163
Percentage of InvestmentIncomeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeNet us-gaap:StatementScenario

amch:AttributableEarningsBeforeInterestTaxesDepreciationAmortization


Investment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.20.40.00.20.10.10.30.2
Percentage of InvestmentIncomeNet3.39.80.0-2.1-3.720.014.31.2

us-gaap:LeaseCost

us-gaap:LeaseCost


Lease
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value215199215222232255273256275263
Percentage of LeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance


Noncontrolling
Period End2020-09-30
Value36
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance100.0

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Noncontrolling
Period End2021-03-312020-09-30
Value0.21.8
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance0.04.9

us-gaap:NoncontrollingInterest


Noncontrolling
Period End2021-03-312020-09-30
Value-4.034
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance0.095.1

us-gaap:Parent


Noncontrolling
Period End2021-03-312020-09-30
Value0.21.8
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance0.04.9

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Oci
Period End2021-06-302021-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.33.5-15.70.10.00.15.60.10.0050.0040.0040.2110.00.00.701
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0

us-gaap:AccumulatedOtherComprehensiveIncome


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value21-51.0891155-93.670-68.1-9.3-25.4-20.5-5.6-109.111223477-2.0-4.3750.3890.581-0.1961.568-2.076-1.0982.141-11.552
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent7133.3-1457.10.00.00.00.0-450.3-68100.00.0-25400.0-366.1-5600.00.00.00.00.00.00.00.07780.014525.0-4900.0743.10.00.0305.40.0

us-gaap:AccumulatedTranslationAdjustment


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value21-54.5931155-93.686-68.2-9.3-25.4-26.1-5.7-107.611223477-2.2-4.6470.160.677-0.0710.3910.7-0.6950.9760.3211.09
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent7033.3-1557.10.00.00.00.0-550.3-68200.00.0-25400.0-466.1-5700.00.00.00.00.00.00.00.03200.016925.0-1775.0185.30.00.0139.20.00.0

us-gaap:OperatingLeaseCost us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OperatingLeaseCost

amch:RentExpense, amch:Theatres


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value190175194198203216217219220218
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GeneralAndAdministrativeExpense, amch:OfficeAndOther


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.31.41.51.31.31.31.40000000000000041.41.41.3
Percentage of OperatingLeaseCost0.70.80.80.70.60.60.60.60.60.6

us-gaap:OperatingExpense, amch:Theatres


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.70.80.20.30.12.24.61.61.21.7
Percentage of OperatingLeaseCost-0.40.50.10.20.01.02.10.70.50.8

us-gaap:OperatingExpense, us-gaap:Equipment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.32.33.13.83.83.93.93.53.53.5
Percentage of OperatingLeaseCost1.21.31.61.91.91.81.81.61.61.6

us-gaap:OperatingLeaseExpense

us-gaap:OperatingLeaseExpense


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value205192207214224237241238245242204203199
Percentage of OperatingLeaseExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseImpairmentLoss us-gaap:FairValueByMeasurementFrequency

us-gaap:OperatingLeaseImpairmentLoss

us-gaap:FairValueMeasurementsNonrecurring


Operating
Period End2020-12-312020-09-302020-03-31
Value371960
Percentage of OperatingLeaseImpairmentLoss100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value223136129669.5240238235232236
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302015-12-312015-09-30
Value0.33.5-5.00.20.60.1-15.70.10.10.15.50.1-0.4-1.2-0.60.2110.0
Percentage of OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value21-54.7931155-93.686-68.2-9.3-25.4-26.1-5.7-107.611223477-2.2-4.6470.160.677-0.0710.3910.7-0.6950.9760.3211.09-0.5990.166-0.162-1.6240.3311.634
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax


Other
Period End2021-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302016-03-312015-12-312015-09-302015-03-312014-12-312014-09-30
Value-900000.0-100000.00100000.0500000.0001000000.0-71000.0391000.0700000.0976000.0321000.01090000.0
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax100.0100.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value20-51.2901156-93.570-68.1-9.2-24.9-20.6-7.5-107.210193376-1.9-4.6210.4740.674-1.8821.658-1.962-1.12-8.616-11.893-1.440.1581.81517-10.2883.3744.254
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-51.01156-93.5-68.1-9.2-24.9-20.5-7.5-107.010193376-1.9-4.6210.4740.674-1.8821.658-1.962-1.12-8.616-11.893
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent99.6100.0100.0100.0100.0100.0100.099.5100.099.8100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncontrollingInterest


Other
Period End2021-03-31
Value-0.2
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent0.4

us-gaap:Parent


Other
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-51.01156-93.5-68.1-9.2-24.9
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent99.6100.0100.0100.0100.0100.0100.0

us-gaap:OtherCostAndExpenseOperating

us-gaap:OtherCostAndExpenseOperating


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value246179192192114356427419437402417400424411419383389363259211200202207195205187186177189179192182187164
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherGeneralAndAdministrativeExpense

us-gaap:OtherGeneralAndAdministrativeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value545165322533263743464348434420324634311920181618174.9411812151837261716
Percentage of OtherGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNonoperatingExpense

us-gaap:OtherNonoperatingExpense


Other
Period End2020-12-312020-09-302020-03-312019-12-312019-03-312018-09-302016-06-30
Value0.095199.62854-0.11
Percentage of OtherNonoperatingExpense0.0100.0100.0100.0100.0100.0100.0

us-gaap:PaidInKindInterest

us-gaap:PaidInKindInterest


Paid
Period End2021-06-302021-03-312020-12-31
Value545243
Percentage of PaidInKindInterest100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-600000.0-1100000.0100000.0-900000.0-600000.0-500000.0-100000.0900000.01400000.0300000.0-200000.0600000.0-1300000.0800000.01200000.01600000.05263000.01091000.0412000.0-251000.0691000.0243000.0-721000.01636000.0612000.0601000.0-3323000.01783000.02026000.0745000.03721000.0956000.0
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfFinancingCosts

us-gaap:PaymentsOfFinancingCosts


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.3190.25.99.20.10.20.51.2123.80.32.027650.0440.2760.5019.2740.9690.00.0780.3067.568-0.4231.4387.9360.175
Percentage of PaymentsOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfFinancingCosts us-gaap:CounterpartyName, us-gaap:DebtInstrument, us-gaap:SubsidiarySaleOfStock

amch:MudrickCapitalManagementLp, amch:SecondLienNotesDue2026, us-gaap:PrivatePlacement


Payments
Period End2021-06-01
Value0.1
Percentage of PaymentsOfFinancingCosts0.0

us-gaap:PaymentsOfFinancingCosts us-gaap:DebtInstrument

amch:New10.500SeniorSecuredNotesDue2026


Payments
Period End2020-09-30
Value6.0
Percentage of PaymentsOfFinancingCosts101.7

us-gaap:PaymentsOfFinancingCosts us-gaap:StatementClassOfStock, us-gaap:TypeOfArrangement

us-gaap:CommonClassA, amch:EquityDistributionAgreement


Payments
Period End2021-06-302021-03-31
Value0.30.4
Percentage of PaymentsOfFinancingCosts100.02.1

us-gaap:CommonClassA, amch:EquityOfferingsAtMarket


Payments
Period End2021-06-302021-01-31
Value0.30.4
Percentage of PaymentsOfFinancingCosts100.00.0

us-gaap:PaymentsOfStockIssuanceCosts us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType

us-gaap:PaymentsOfStockIssuanceCosts

us-gaap:CommonClassA, us-gaap:SubsequentEvent


Payments
Period End2021-05-05
Value3.8
Percentage of PaymentsOfStockIssuanceCosts100.0

us-gaap:PaymentsOfStockIssuanceCosts us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:CommonClassA, us-gaap:SubsequentEvent, amch:EquityDistributionAgreement


Payments
Period End2021-01-312020-10-31
Value141.3
Percentage of PaymentsOfStockIssuanceCosts0.00.0

us-gaap:PaymentsOfStockIssuanceCosts us-gaap:StatementClassOfStock, us-gaap:TypeOfArrangement

us-gaap:CommonClassA, amch:EquityDistributionAgreement


Payments
Period End2021-06-302021-03-312020-09-30
Value25140.1
Percentage of PaymentsOfStockIssuanceCosts0.00.00.0

us-gaap:CommonClassA, amch:EquityOfferingsAtMarket


Payments
Period End2021-06-302021-05-312021-01-31
Value141014
Percentage of PaymentsOfStockIssuanceCosts0.00.00.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value4100000.0001000000.000200000.01100000.00001700000.00006500000.0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation100.00.00.0100.00.00.0100.0100.00.00.00.0100.00.00.00.0100.0

us-gaap:PaymentsToAcquireAssetsInvestingActivities

us-gaap:PaymentsToAcquireAssetsInvestingActivities


Payments
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-30
Value0.09.30.00.00.29.4
Percentage of PaymentsToAcquireAssetsInvestingActivities0.0100.00.00.0100.0100.0

us-gaap:ProceedsFromIssuanceOfCommonStock us-gaap:CounterpartyName, us-gaap:DebtInstrument, us-gaap:SubsidiarySaleOfStock

us-gaap:ProceedsFromIssuanceOfCommonStock

amch:MudrickCapitalManagementLp, amch:SecondLienNotesDue2026, us-gaap:PrivatePlacement


Proceeds
Period End2021-06-01
Value230
Percentage of ProceedsFromIssuanceOfCommonStock100.0

us-gaap:ProceedsFromIssuanceOfCommonStock us-gaap:StatementClassOfStock

us-gaap:CommonClassA


Proceeds
Period End2021-06-302021-03-312020-12-312017-02-172017-02-13
Value98958126139579
Percentage of ProceedsFromIssuanceOfCommonStock0.00.00.00.00.0

us-gaap:ProceedsFromIssuanceOfCommonStock us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType

us-gaap:CommonClassA, us-gaap:SubsequentEvent


Proceeds
Period End2021-05-052017-02-172017-02-13
Value15339579
Percentage of ProceedsFromIssuanceOfCommonStock0.00.00.0

us-gaap:ProceedsFromIssuanceOfCommonStock us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:CommonClassA, us-gaap:SubsequentEvent, amch:EquityDistributionAgreement


Proceeds
Period End2021-01-252021-01-312020-10-232020-10-31
Value5825963353
Percentage of ProceedsFromIssuanceOfCommonStock0.00.00.00.0

us-gaap:ProceedsFromIssuanceOfCommonStock us-gaap:StatementClassOfStock, us-gaap:TypeOfArrangement

us-gaap:CommonClassA, amch:EquityDistributionAgreement


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-30
Value10145962692.9
Percentage of ProceedsFromIssuanceOfCommonStock0.00.00.00.0

us-gaap:CommonClassA, amch:EquityOfferingsAtMarket


Proceeds
Period End2021-06-302021-05-312021-01-31
Value587427596
Percentage of ProceedsFromIssuanceOfCommonStock0.00.00.0

us-gaap:ProceedsFromIssuanceOfCommonStock us-gaap:TypeOfArrangement

amch:EquityOfferingsAtMarket


Proceeds
Period End2021-06-032021-04-272021-01-252020-12-11
Value587427244352
Percentage of ProceedsFromIssuanceOfCommonStock0.00.00.00.0

us-gaap:ProceedsFromIssuanceOfDebt us-gaap:BusinessAcquisition

us-gaap:ProceedsFromIssuanceOfDebt

amch:OdeonAndUciCinemasHoldingsLimited


Proceeds
Period End2021-06-302021-03-31
Value0.0534
Percentage of ProceedsFromIssuanceOfDebt0.0100.0

us-gaap:ProceedsFromIssuanceOfMediumTermNotes us-gaap:DebtInstrument

us-gaap:ProceedsFromIssuanceOfMediumTermNotes

amch:FirstLienNotesDue2026


Proceeds
Period End2020-12-312020-09-30
Value0.0-220.0
Percentage of ProceedsFromIssuanceOfMediumTermNotes0.0100.0

amch:FirstLienToggleNotesDue2026


Proceeds
Period End2021-06-302021-03-31
Value0.0100
Percentage of ProceedsFromIssuanceOfMediumTermNotes0.00.0

us-gaap:ProceedsFromMinorityShareholders

us-gaap:ProceedsFromMinorityShareholders


Proceeds
Period End2020-12-31
Value-0.5
Percentage of ProceedsFromMinorityShareholders100.0

us-gaap:ProceedsFromPaymentsToMinorityShareholders

us-gaap:ProceedsFromPaymentsToMinorityShareholders


Proceeds
Period End2021-06-302021-03-31
Value-100000.0-300000.0
Percentage of ProceedsFromPaymentsToMinorityShareholders100.0100.0

us-gaap:ProceedsFromRepaymentsOfLinesOfCredit

us-gaap:ProceedsFromRepaymentsOfLinesOfCredit


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-09-302016-12-312016-09-302016-06-302016-03-31
Value0.0-335.0-0.4-0.6-2.3325-10.310-8.2-3.85.510.0-20.020-25.0-50.0
Percentage of ProceedsFromRepaymentsOfLinesOfCredit0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-3.85.2174.90.33.41.80.14.0170.30.49.73.81.60.1184.00.5440.441135.390.00.00.2290.00.137-0.128-0.766-0.22-0.1254.991
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2020-09-302020-06-302020-03-312018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-0.2-0.6-0.11.22.50.00.6-0.10.014-0.007-0.006100.466
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncome


Reclassification
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-1.0-0.2-0.6-0.10.10.0-0.1-0.50.01.9-2.11.42.81.00.6-0.10.246-0.085-0.0931.686-0.09-0.1140.022100.341
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent0.0100.0100.0100.00.00.00.00.00.00.00.0116.7112.00.0100.0100.00.00.00.00.0-642.91628.6-366.798.973.2

us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Related
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.40.30.82.4
Percentage of RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty100.0100.0100.0100.0

us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty us-gaap:IncomeStatementLocation, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:CostOfSales, amch:ACJVLLC


Related
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.60.10.82.40.62.92.87.3
Percentage of RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty0.00.0100.0100.00.00.00.00.0

us-gaap:OperatingExpense, amch:DigitalCinemaImplementationPartnersLLC


Related
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.4-0.3-0.41.30.90.80.81.1
Percentage of RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty0.00.0-50.054.20.00.00.00.0

us-gaap:RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Related
Period End2021-06-302021-03-312020-06-302020-03-31
Value1.20.60.05.7
Percentage of RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty100.0100.00.0100.0

us-gaap:RepaymentsOfLinesOfCredit us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:RepaymentsOfLinesOfCredit

amch:OdeonCinemasGroupLimited, amch:OneFortyMillionTermLoanFacility, us-gaap:SubsequentEvent


Repayments
Period End2021-02-15
Value89
Percentage of RepaymentsOfLinesOfCredit100.0

amch:OdeonCinemasGroupLimited, amch:TwoNinetySixMillionTermLoanFacility, us-gaap:SubsequentEvent


Repayments
Period End2021-02-15
Value12
Percentage of RepaymentsOfLinesOfCredit14.3

us-gaap:RepaymentsOfSecuredDebt

us-gaap:RepaymentsOfSecuredDebt


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value5.05.05.05.05.05.05.05.08.53.43.53.43.43.53.53.43.52.22.2012.2022.2012.2020.01.9381.9371.9381.9371.9381.9371.9381.9371.9371.9382.001
Percentage of RepaymentsOfSecuredDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromRelatedParties us-gaap:IncomeStatementLocation, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RevenueFromRelatedParties

amch:OtherRevenues, amch:DigitalCinemedia


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.20.03.67.75.55.33.9
Percentage of RevenueFromRelatedParties0.0100.00.0100.0100.0100.0100.0100.0

amch:OtherRevenues, amch:Screenvision


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.10.02.13.84.23.5
Percentage of RevenueFromRelatedParties50.00.058.369.179.289.7

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3723625.464691581889421
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

amch:RestrictedStockUnitPerformanceStockUnitAndSpecialPerformanceStockUnitAwards


Share
Period End2021-06-302021-03-31
Value6.695.22
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

amch:RestrictedStockUnitPerformanceStockUnitAndSpecialPerformanceStockUnitAwards


Share
Period End2021-06-302021-03-31
Value07.7
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.0100.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:CounterpartyName, us-gaap:DebtInstrument, us-gaap:StatementClassOfStock, us-gaap:SubsidiarySaleOfStock

us-gaap:StockIssuedDuringPeriodSharesNewIssues

amch:MudrickCapitalManagementLp, amch:SecondLienNotesDue2026, us-gaap:CommonClassA, us-gaap:PrivatePlacement


Stock
Period End2021-06-01
Value8.5
Percentage of StockIssuedDuringPeriodSharesNewIssues100.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:CounterpartyName, us-gaap:StatementClassOfStock

amch:MudrickCapitalManagementLp, us-gaap:CommonClassA


Stock
Period End2020-12-14
Value21
Percentage of StockIssuedDuringPeriodSharesNewIssues0.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType

us-gaap:CommonClassA, us-gaap:SubsequentEvent


Stock
Period End2021-05-052017-02-172017-02-13
Value151.28325519
Percentage of StockIssuedDuringPeriodSharesNewIssues0.00.00.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:CommonClassA, us-gaap:SubsequentEvent, amch:EquityDistributionAgreement


Stock
Period End2021-01-252021-01-312020-10-232020-10-31
Value501871114
Percentage of StockIssuedDuringPeriodSharesNewIssues0.00.00.00.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:StatementClassOfStock, us-gaap:TypeOfArrangement

us-gaap:CommonClassA, amch:EquityDistributionAgreement


Stock
Period End2020-12-31
Value40
Percentage of StockIssuedDuringPeriodSharesNewIssues0.0

us-gaap:CommonClassA, amch:EquityOfferingsAtMarket


Stock
Period End2021-06-302021-05-312021-01-31
Value1143187
Percentage of StockIssuedDuringPeriodSharesNewIssues0.00.00.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:TypeOfArrangement

amch:EquityOfferingsAtMarket


Stock
Period End2021-06-032021-04-272021-01-252020-12-11
Value114350137
Percentage of StockIssuedDuringPeriodSharesNewIssues0.00.00.00.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationForfeited dei:LegalEntity, us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationForfeited

amch:DalianWandaGroupLtd, us-gaap:CommonClassB, us-gaap:SubsequentEvent


Stock
Period End2021-01-27
Value5666000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensationForfeited100.0

us-gaap:StockIssuedDuringPeriodValueAcquisitions

us-gaap:StockIssuedDuringPeriodValueAcquisitions


Stock
Period End2020-09-30
Value20
Percentage of StockIssuedDuringPeriodValueAcquisitions100.0

us-gaap:StockIssuedDuringPeriodValueAcquisitions us-gaap:StatementClassOfStock

us-gaap:CommonClassA


Stock
Period End2020-09-30
Value0.1
Percentage of StockIssuedDuringPeriodValueAcquisitions0.5

us-gaap:StockIssuedDuringPeriodValueAcquisitions us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2020-09-30
Value20
Percentage of StockIssuedDuringPeriodValueAcquisitions99.5

us-gaap:Parent


Stock
Period End2020-09-30
Value20
Percentage of StockIssuedDuringPeriodValueAcquisitions100.0

us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecurities

us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecurities


Stock
Period End2021-03-31
Value606
Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecurities100.0

us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecurities us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonClassA, us-gaap:CommonStock


Stock
Period End2021-03-31
Value0.4
Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecurities0.1

us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecurities us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-03-31
Value606
Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecurities99.9

us-gaap:Parent


Stock
Period End2021-03-31
Value606
Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecurities100.0

us-gaap:StockIssuedDuringPeriodValueOther us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueOther

us-gaap:CommonClassA, us-gaap:CommonStock


Stock
Period End2021-03-31
Value500000.0
Percentage of StockIssuedDuringPeriodValueOther100.0

us-gaap:CommonClassB, us-gaap:CommonStock


Stock
Period End2021-03-31
Value-500000.0
Percentage of StockIssuedDuringPeriodValueOther-100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross


Stock
Period End2021-06-302021-03-312020-06-302020-03-31
Value8.45.43.72.7
Percentage of StockIssuedDuringPeriodValueShareBasedCompensationGross100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-06-302020-03-31
Value8.45.43.72.7
Percentage of StockIssuedDuringPeriodValueShareBasedCompensationGross100.0100.0100.0100.0

us-gaap:Parent


Stock
Period End2021-06-302021-03-31
Value8.45.4
Percentage of StockIssuedDuringPeriodValueShareBasedCompensationGross100.0100.0

us-gaap:UndistributedEarningsLossAvailableToCommonShareholdersDiluted

us-gaap:UndistributedEarningsLossAvailableToCommonShareholdersDiluted


Undistributed
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-343.6-566.9-945.8-905.8-561.2-2176.3-13.5-54.823-130.2113-100.42217
Percentage of UndistributedEarningsLossAvailableToCommonShareholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:VariableLeaseCost us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:VariableLeaseCost

amch:RentExpense, amch:Theatres


Variable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value14161315202023192523
Percentage of VariableLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingExpense, us-gaap:Equipment


Variable
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4.8-0.20.1-0.57.0197.41910
Percentage of VariableLeaseCost32.4-1.50.6-2.533.580.337.675.846.5

amch:AccountsPayableForContractualAmountDue

amch:AccountsPayableForContractualAmountDue


Accounts
Period End2020-09-30
Value185
Percentage of AccountsPayableForContractualAmountDue100.0

amch:AccountsPayablesContractualRentPaymentsDueAndNotPaid

amch:AccountsPayablesContractualRentPaymentsDueAndNotPaid


Accounts
Period End2021-06-302020-12-31
Value69138
Percentage of AccountsPayablesContractualRentPaymentsDueAndNotPaid100.0100.0

amch:AccountsPayablesContractualRentPaymentsDueAndNotPaid us-gaap:LeaseContractualTerm

amch:LeaseTermThreeMonthsEndedDecember312021


Accounts
Period End2021-06-30
Value22
Percentage of AccountsPayablesContractualRentPaymentsDueAndNotPaid33.2

amch:LeaseTermThreeMonthsEndedJune312022


Accounts
Period End2021-06-30
Value15
Percentage of AccountsPayablesContractualRentPaymentsDueAndNotPaid21.7

amch:LeaseTermThreeMonthsEndedMarch312022


Accounts
Period End2021-06-30
Value11
Percentage of AccountsPayablesContractualRentPaymentsDueAndNotPaid17.1

amch:LeaseTermThreeMonthsEndedSeptember302021


Accounts
Period End2021-06-30
Value19
Percentage of AccountsPayablesContractualRentPaymentsDueAndNotPaid28.0

amch:AccountsPayablesContractualRentPaymentsDueAndNotPaidDeferredFinanceLease

amch:AccountsPayablesContractualRentPaymentsDueAndNotPaidDeferredFinanceLease


Accounts
Period End2020-12-31
Value500000.0
Percentage of AccountsPayablesContractualRentPaymentsDueAndNotPaidDeferredFinanceLease100.0

amch:AccountsPayablesContractualRentPaymentsDueAndNotPaidDeferredVariableLease

amch:AccountsPayablesContractualRentPaymentsDueAndNotPaidDeferredVariableLease


Accounts
Period End2020-12-31
Value15
Percentage of AccountsPayablesContractualRentPaymentsDueAndNotPaidDeferredVariableLease100.0

amch:AccruedCasualtyClaimsAndPremiumsCurrent

amch:AccruedCasualtyClaimsAndPremiumsCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value6.71211118.4528.5919.21110
Percentage of AccruedCasualtyClaimsAndPremiumsCurrent100.0100.0100.0100.0100.0100.0100.0100.0

amch:AccruedCasualtyClaimsAndPremiumsNoncurrent

amch:AccruedCasualtyClaimsAndPremiumsNoncurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value281715171513109.525
Percentage of AccruedCasualtyClaimsAndPremiumsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0

amch:AccruedPayrollAndVacationCurrent

amch:AccruedPayrollAndVacationCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value2843393039121021
Percentage of AccruedPayrollAndVacationCurrent100.0100.0100.0100.0100.0100.0100.0100.0

amch:ContingentLeaseLiabilities

amch:ContingentLeaseLiabilities


Contingent
Period End2021-03-312020-12-31
Value1130
Percentage of ContingentLeaseLiabilities100.0100.0

amch:ContractsWithCustomersDeferredRevenue

amch:ContractsWithCustomersDeferredRevenue


Contracts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value400402400394401396447345366366412288306317365
Percentage of ContractsWithCustomersDeferredRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

amch:ContractsWithCustomersDeferredRevenue amch:EquityMethodInvestmentActivityByClassification

amch:ExhibitorServicesAgreement


Contracts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value519524537542546550549553557561564567571530
Percentage of ContractsWithCustomersDeferredRevenue129.9130.3134.2137.2136.2138.8122.9160.2152.2153.1136.6196.7186.2145.2

amch:ConvertibleDebtCarryingValue us-gaap:DebtInstrument

amch:ConvertibleDebtCarryingValue

amch:SeniorUnsecuredConvertibleNotesDue2024


Convertible
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-09-14
Value529522518515520510541524642587
Percentage of ConvertibleDebtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConvertibleNotesPayable


Convertible
Period End2020-09-302019-12-312018-09-14
Value526515524
Percentage of ConvertibleDebtCarryingValue0.0100.089.2

amch:CurrentMaturitiesOfOperatingLeaseLiabilitiesDeferredFinanceLease

amch:CurrentMaturitiesOfOperatingLeaseLiabilitiesDeferredFinanceLease


Current
Period End2020-12-31
Value3000000.0
Percentage of CurrentMaturitiesOfOperatingLeaseLiabilitiesDeferredFinanceLease100.0

amch:CurrentMaturitiesOfOperatingLeaseLiabilitiesDeferredOperatingLease

amch:CurrentMaturitiesOfOperatingLeaseLiabilitiesDeferredOperatingLease


Current
Period End2020-12-31
Value67
Percentage of CurrentMaturitiesOfOperatingLeaseLiabilitiesDeferredOperatingLease100.0

amch:CurrentMaturitiesOfOperatingLeaseLiabilitiesResolutionOfContingenciesDeferredOperatingLease

amch:CurrentMaturitiesOfOperatingLeaseLiabilitiesResolutionOfContingenciesDeferredOperatingLease