AOS


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

Table of contents


us-gaap:StatementClassOfStock
us-gaap:CommonStockValue

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostOfGoodsAndServicesSold

us-gaap:GrossProfit

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit
us-gaap:RestructuringCostAndReserve

us-gaap:InterestExpense

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
us-gaap:StatementGeographical, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:OtherNonoperatingIncomeExpense
us-gaap:ConsolidationItems

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:Assets
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:MarketableSecuritiesCurrent

us-gaap:ReceivablesNetCurrent

us-gaap:InventoryNet

us-gaap:InventoryFinishedGoods

us-gaap:InventoryLIFOReserve

us-gaap:OtherAssetsCurrent

us-gaap:NoncurrentAssets
us-gaap:StatementGeographical

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:StatementBusinessSegments
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:LongTermDebt
us-gaap:LongtermDebtType

us-gaap:LongTermDebtNoncurrent
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

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

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue
us-gaap:StatementEquityComponents
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DepreciationDepletionAndAmortization

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:StatementEquityComponents
aos:AdjustmentsToAdditionalPaidInCapitalShareUnitsIssued

aos:PaymentsForProceedsFromStockOptionsActivity
us-gaap:AwardType
aos:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue
us-gaap:StatementEquityComponents
aos:StockIssuedDuringPeriodValueStockIncentiveAndDirectorsCompensation
us-gaap:StatementEquityComponents
aos:VestingOfShareUnits

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost
us-gaap:RetirementPlanType
us-gaap:StatementEquityComponents
us-gaap:DividendsCommonStockCash

us-gaap:IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet

us-gaap:IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
us-gaap:IncomeStatementLocation
us-gaap:LeaseCost
us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent
us-gaap:IncomeStatementLocation
us-gaap:OperatingLeaseCost

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax
us-gaap:DerivativeInstrumentRisk

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax

us-gaap:OtherRestructuringCosts
us-gaap:StatementScenario, us-gaap:BusinessAcquisition, us-gaap:ContingentConsiderationByType
us-gaap:PaymentForContingentConsiderationLiabilityInvestingActivities

us-gaap:PaymentsForRestructuring
us-gaap:RestructuringCostAndReserve

us-gaap:PaymentsToAcquireMarketableSecurities

us-gaap:ProceedsFromSaleAndMaturityOfMarketableSecurities

us-gaap:ProductWarrantyAccrualPayments

us-gaap:ProductWarrantyAccrualWarrantiesIssued
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodTax
us-gaap:AwardType
us-gaap:RestrictedStockExpense

us-gaap:RestructuringCharges
us-gaap:RestructuringCostAndReserve
us-gaap:StatementBusinessSegments

us-gaap:SeveranceCosts1
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice

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

us-gaap:StockOptionPlanExpense
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:VariableLeaseCost

aos:DeferredTaxAssetEnvironmental

aos:DeferredTaxAssetTaxLossAndCreditCarryovers

aos:DeferredTaxAssetsAccountsReceivable

aos:DefinedBenefitPlanFairValueOfNonInvestmentPlanAssets

aos:DefinedBenefitPlanFairValueOfPlanAssetsIncludingNoninvestmentPlanAssets

aos:DistributorRebateAccruals

aos:LesseeOperatingLeaseLiabilityToBePaidDueAfterYearFour

aos:LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption

aos:LongTermDebtFixedInterestPayment

aos:NetOperatingLossesAndTaxCredits

aos:RentIncentivesAndDeferrals

aos:TaxesPayableOnForeignEarningsNotPermanentlyReinvested
us-gaap:StatementClassOfStock
dei:EntityCommonStockSharesOutstanding

us-gaap:AccountsPayableTradeCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:AssetsFairValueDisclosure

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsInventory

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
us-gaap:Range, us-gaap:DefinedBenefitPlanByPlanAssetCategories
us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1
us-gaap:DefinedBenefitPlanByPlanAssetCategories
us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations
us-gaap:HedgingDesignation
us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeFairValueOfDerivativeAsset
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:Currency, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:Position
us-gaap:DerivativeNotionalAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:Position
us-gaap:StatementGeographical, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:IntangibleAssetsGrossExcludingGoodwill

us-gaap:InventoryGross

us-gaap:InventoryRawMaterials

us-gaap:InventoryWorkInProcess

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:LiabilitiesFairValueDisclosure
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:NotesPayable

us-gaap:NotesPayableFairValueDisclosure

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:OtherCommitments
us-gaap:OtherCommitment
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent

us-gaap:PercentageOfLIFOInventory

us-gaap:ProductWarrantyAccrual

us-gaap:ProductWarrantyAccrualClassifiedCurrent

us-gaap:ProductWarrantyAccrualNoncurrent

us-gaap:PurchaseObligation

us-gaap:RestructuringReserve
us-gaap:RestructuringCostAndReserve
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance

Plots across concepts


IncomeStatement
Net Income Loss
Expenses
Interest Expense
Balance Sheet
Operating Lease Right Of Use Asset
Assets
Operating Lease Right Of Use Asset
Current Assets
Other Assets Current
NonCurrent Assets
Operating Lease Right Of Use Asset
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Current Liabilities
Long Term Debt Current
Noncurrent Liabilities
Operating Lease Liability Noncurrent
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
Per Share
Common Stock Dividends Per Share Declared
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
DividendsAndRepurchase
Payments Of Dividends Common Stock
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Net
InventoryNet
Inventory Finished Goods
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock aos:CommonStockClassUndefined██▁▁164.7164.7164.6164.6NANA164.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassA████████████████████▁▁▁▁▁▁▁▁▁▁▁130.6130.6130.8130.8130.9130.9130.9130.9130.9131.0131.0131.0131.0131.0131.2131.2131.2131.4131.6131.865.965.965.966.066.166.166.166.266.266.266.4NANANA66.6NANANANANANANANANANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█161.731973162.785323NA162.479678162.173842162.897605NA165.543245168.086268169.096142NA172.084616172.730166173.350664NA174.355743174.889449175.419919NA353.096756176.99872177.810722NA178.739148179.65031180.33385NA181.2115182.312626183.93199NA185.456122186.463816186.36978NA93.13818493.14796292.976672NA93.28504693.29299493.080942NA92.5083192.223562NA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█160.241814161.526733NA161.411049161.208194161.871788NA164.298458166.825601167.803794NA170.507922171.063565171.532008NA172.446529172.992419173.380076NA348.819578174.96172175.694006NA177.396392178.278228178.872992NA179.890928181.01831182.461764NA184.101864185.311114185.102124NA92.38790492.55155692.206386NA92.44320692.3792292.000026NA91.5934391.53577NA
us-gaap:EarningsPerShareBasic ▃▃▃▃▂▂▃▃▃▃▃▃▃▃▁▃▃▂▂▁▂▂▂▂▂▂▂▂▂▁▁▁▁▁▂▂▂▂▂█▃▂▂▂▁▂0.740.60.740.650.420.320.560.530.610.530.750.610.670.580.130.540.530.510.480.240.50.420.4550.4150.40.3250.2950.280.3150.2550.230.250.2250.210.4250.40.380.5150.3451.970.5450.4450.350.350.180.34
us-gaap:EarningsPerShareDiluted ▃▃▃▃▂▂▃▃▃▃▃▃▃▃▁▃▃▂▂▁▂▂▂▂▂▂▂▂▂▁▁▁▁▁▂▂▂▂▂█▃▂▂▂▁▂0.730.60.740.650.420.320.560.530.610.530.740.610.660.570.130.540.530.50.470.2350.490.4150.450.410.3950.3250.2950.280.3150.2550.230.250.2250.210.4250.3950.3750.510.3451.9550.540.440.3450.3450.180.335
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 Operating Margin us-gaap:ConsolidationItems us-gaap:IntersegmentEliminationNANA-5.4-5.4-6.3NANA-6.7-7.7NANANANA-7.5NA-6.2-5.3-6.8NANANA-4.4NANANANANANANANANA-9.1NANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,aos:NorthAmericaSegment█▆▇▆▄▆▆▅▆▆▆▅▆▅▄▄▄▅▃▃▃▃▂▂▃▃▃▂▂▂▁▁603.6552.9560.9000000000002544.0480.5532.9523.1514.6524.0521.8521.9486.9534.2501.7460.8486.0470.7487.3435.7450.8432.8423.9413.7417.4442.7429.2430.7392.4410.1388.5382.2370.1NANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,aos:RestOfWorld█▁263.2222.3NA221.4189.7110.2234.3220.3249.1232.1297.6274.1308.1293.8313.9270.1272.8259.5268.0240.3239.8217.4231.8217.1221.3195.9203.4198.5193.6172.8185.0175.2NANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 TTM Greenblatt ROC _ _█▆█▇▄▃▆▅▇▅█▆▇▆▇▆▆▆▅▆▆▅▅▅▅▄▃▃▃▂▂▂▂▂▂▁▁▁▁164.0142.2169.2149.899.384.9129.9125.7145.2128.3167.1144.7159.6142.0155.7144.0141.6136.6127.6131.6137.2118.7120.7117.9116.997.489.583.092.580.471.878.377.472.376.163.463.556.458.4NANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AllocatedShareBasedCompensationExpense ▂▇▂▂▂█▁▂▂█▁▂▂▆▂▂▂▅▂▂▂▅▂▁▂▅▂▂▂▅▂▃▃▄▂▂▂1.57.41.21.11.49.01.01.52.18.70.41.81.46.51.41.31.35.91.31.21.85.11.11.01.15.61.21.82.05.81.72.42.44.01.51.51.4NANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▇▆▇▇▅▃▆▄▅▆▅▅▅▇▃▆▆▆▃▅▄▅▄▄▅▄▃▄▄▃▅▄▃▃▂▃▃▄▁█▄▃▃▃▂127.898.1135.3124.774.437.6104.664.195.8108.093.790.885.8122.645.6112.0103.998.744.381.967.982.656.959.172.752.835.755.061.742.592.655.638.444.520.939.629.049.7-15.9158.251.041.031.341.86.7NA
us-gaap:CostOfGoodsAndServicesSold █▅▇▄▂▁▄▃▄▄▅▄▆▄▃▃▃538.4480.4510.4462.9416.4397.4455.9444.0456.7455.4475.5448.1492.3466.5446.3444.9434.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:GrossProfit ▇▆▇▇▅▅▇▆▇▇█▇█▇▇▇▇▇▆▆▆▆▆▅▆▅▅▄▄▄▄▄▄▃▃▂▃▂▂▁▁▂▁▁▁▁321.4288.6324.1297.1247.5239.5295.0284.2308.7292.8337.0306.0341.0321.5323.8306.7305.9302.3289.6283.3283.7262.7262.6256.7263.3229.2231.9215.3216.2195.9199.9196.6198.0179.3185.6156.8160.5149.1155.0118.7111.9127.0116.3107.2114.2108.3
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest █▆█▇▃▁▅▅▆▅█▆▇▆▇▆▆▅▅▅▆▄▄▄▄▂▁▁151.3126.1151.9137.387.067.7115.5112.8132.2111.6154.8131.5146.1125.4140.8131.6128.0120.4116.4118.4124.1103.6109.3107.2103.282.873.969.3NANANANANA57.161.352.050.669.982.039.841.033.787.223.3-6.6NA
us-gaap:IncomeTaxExpenseBenefit ▃▃▃▃▂▂▃▃▃▃▃▃▃▃█▃▃▃▃▃▃▃▃▃▃▃▂▂▃▂▂▂▂▂▂▂▂▃▂▂▂▂▂▂▁▂33.128.431.90000000000000631.919.216.024.225.530.122.328.526.931.626.6118.137.935.632.733.735.237.030.129.533.632.124.420.718.721.318.214.315.119.218.118.115.015.622.415.512.912.49.58.27.1-5.77.7
us-gaap:InterestExpense ▁▁▁▃▅▅▅▇█▄▄▄▅▅▇▅▅▅▃▄▄▃▂▃▅▄▂▃▂▂▂▂▃▃▄▄▅▇▇▅▄▄▄▃▃▃0.91.01.01.62.52.22.53.13.42.01.82.02.32.32.92.52.52.21.62.11.91.71.41.62.51.91.41.51.41.41.21.41.61.52.11.92.23.02.92.52.11.81.91.71.61.7
us-gaap:NetIncomeLoss ▇▆█▇▄▃▆▅▆▆█▇▇▆▁▆▆▅▅▅▅▄▅▄▄▃▃▃▃▃▂▃118.297.7120.0105.467.851.791.387.3102.189.3126.3104.6114.598.822.793.792.487.782.783.287.173.579.873.671.158.453.250.657.346.742.446.2NANANANANANA32.1182.350.341.032.232.016.630.9
us-gaap:OperatingIncomeLoss █▇█▇▄▃▆▆▇▆█▇▇▇▇▇▇▆▆▆▆▅▅▅▅▄▄▃▄▃▃▃▃▃▃▂▂▂▂▁▂▁164.0142.2169.2149.899.384.9129.9125.7145.2128.3167.1144.7159.6142.0155.7144.0141.6136.6127.6131.6137.2118.7120.7117.9116.997.489.583.092.580.471.878.377.472.376.163.463.556.458.439.949.348.9NANANANA
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax █▁▆█▄▇▇▅0.9-2.00.20.7-0.80.30.6-0.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▆▅██▆▃▇▂▄█▅▂▁█▇█▇▆▁▅▃▇▃▃▅▄▄▅▆▄▆▆▅▅▅▆▅▆▆▃▆4.9-1.416.715.73.7-18.014.8-21.9-10.115.9-5.1-20.7-31.018.414.517.313.67.3-27.8-3.5-17.18.6-14.7-17.8-0.9-9.3-7.4-1.52.7-10.42.43.6-4.1-1.5-0.16.1-5.82.82.4-16.03.2NANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▂▃▁▂▂▂▂▂▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂█▂▅▃▁▂▁▁▁3.95.00.02.84.04.22.94.05.65.55.75.14.65.82.93.21.92.43.21.92.32.03.22.22.72.71.71.01.21.31.01.10.71.01.82.21.229.11.115.85.1-2.21.5-0.3-1.2-0.5
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▇█▇▅▅▆▆▇▆▇▆█▇▇▆▆▆▆▆▅▅▅▅▅▅▅▄▄▄▄▃▄▃▃▂▃▂▃▂▂▂▁▁▁▁859.8769.0834.5760.0663.9636.9750.9728.2765.4748.2812.5754.1833.3788.0768.6749.9738.2740.0698.1683.9667.0636.9639.4625.1653.5618.5626.8581.6595.4552.2558.9536.2549.1509.6524.2462.2484.2468.6475.8412.0405.3417.4370.2377.4375.0366.7
us-gaap:SellingGeneralAndAdministrativeExpense ▇▆▆▆▆▇▇▇▇▇▇▇██▇▇▇▇▇▆▆▆▅▅▆▅▆▅▅▄▅▄▄▄▄▃▃▃▃▂▁▂▂▁▁▁173.1166.5171.2159.4155.9173.8179.9172.3178.7184.7186.1177.6197.2192.9183.0175.8177.3182.1174.8164.7160.0159.4153.1150.1160.3147.2158.3145.5137.4130.9139.2133.7131.6120.0124.8111.5108.9105.3106.292.285.189.386.081.983.877.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets █▇█▇▇▇▇▇██▇▇▇▇█▇▇▆▆▆▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▃▃▁▂▁3140.23106.83160.72971.12984.22983.03058.03067.93175.63143.53071.53025.23085.33106.93197.33104.62984.02940.22891.02824.42672.22650.62646.52600.22589.82565.32515.32486.82430.72381.22391.52348.92295.22267.12265.22235.32191.62250.22349.02358.72143.12205.32112.0NANANA
us-gaap:Liabilities ▅▄▅▄▅▆▆▆▇▆▅▄▅▆█▇▆▆▆▅▃▃▃▃▃▃▂▂▂▁▁▂▁▁▂▁▁▂▄▄▃▄▄1323.91257.81312.41224.01326.11366.71391.21411.71450.51394.31354.51269.01355.01398.51548.51438.71370.31373.81375.71298.81191.51172.11204.21177.81153.31160.21134.01111.61074.01037.81062.81096.31038.71031.41071.11043.91033.81109.51263.21235.21173.31283.41230.6NANANA
us-gaap:LiabilitiesAndStockholdersEquity █▇█▇▇▇▇▇██▇▇▇▇█▇▇▆▆▆▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▃▃▁▂▁3140.23106.83160.72971.12984.22983.03058.03067.93175.63143.53071.53025.23085.33106.93197.33104.62984.02940.22891.02824.42672.22650.62646.52600.22589.82565.32515.32486.82430.72381.22391.52348.92295.22267.12265.22235.32191.62250.22349.02358.72143.12205.32112.0NANANA
us-gaap:StockholdersEquity ███▆▅▅▅▅▆▇▆▇▆▆▅▅▅▄▃▃▃▃▂▂▂▁▁▁1816.31849.01848.31747.11658.11616.31666.81656.21725.11749.21717.01756.21730.31708.41648.81665.91613.71566.41515.31525.61480.71478.51442.31422.41436.51405.11381.31375.2NANA1328.7NANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AssetsCurrent ▇▆▇▅▅▅▆▆▇▇▇▇▇▇█▇▇▇▆▆▅▅▅▅▅▅▄▄▄▃▃▃▃▃▃▃▂▃▄▄▂▂▁1585.71558.21618.01430.31444.41442.51500.41504.41596.61658.11638.51598.71653.31669.11766.81698.11640.31605.51562.01507.61449.01425.91455.31413.81400.01376.31319.01294.81233.91198.21205.61165.01125.61105.81107.21088.41053.81106.71208.71227.4991.2987.0896.0NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▆██▅▆▆▅▃▄▅▄▃▄▃▅▄▄▄▅▄▄▄▄▄▃▄▄▆▅▅▅▅▅▄▄▄▄▅▆▆▁▂▂▁▁▁444.8578.5573.1377.9442.7416.1374.0219.4281.6337.8259.7233.0260.0241.9346.6321.9306.6293.4330.4269.3287.4305.5323.6282.9248.1284.1319.4400.5393.7369.8380.7374.1366.1306.9266.9279.6259.6367.2463.4440.6108.2124.2118.9109.194.079.8
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▅██▄▅▅▄▁444.8578.5573.1377.9442.7416.1374.0219.4NANA259.7NANANA346.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:MarketableSecuritiesCurrent ▂▁▂▂▂▂▃▅▅▅▆▆▇▇██▇▇▇▇▆▅▅▅▅▅▃▂▁▁▁▁▁▂▃137.187.0116.5131.1126.0135.6177.4294.4296.2295.5385.3384.8398.4437.8473.4446.0434.3428.9424.2409.5379.8335.3321.6323.5304.3290.8222.5123.2102.9102.7105.3102.797.8144.5196.0NANANANANANANANANANANA
us-gaap:ReceivablesNetCurrent ▇▅▇▆▅▅▇▇███▇██▇▇▆▆▅▅▅▅▅▄▅▅▄▄▄▄▄▃▃▃▃▂▂▂▂▂▁▂▁607.0534.5585.0572.9515.9524.0589.5614.1634.8658.8647.3606.6644.0638.8598.4587.1566.8584.1518.7517.3493.9506.9501.4479.0528.5495.9475.4474.3457.0455.6458.7436.0422.6423.7425.4369.1382.7386.7368.4369.5327.7362.0313.3NANANA
us-gaap:InventoryNet █▇▇▇▇▇▇▇██▇▇▆▆▇▇▆▅▅▅▄▄▄▅▄▄▃▄▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁330.4312.8300.1302.6306.0312.3303.0310.0323.1319.7304.7307.7289.0287.1291.2292.1287.0257.1251.1258.6237.8230.2222.9239.0233.4218.8208.3218.5206.8197.4193.4189.5178.9169.8163.4178.2177.0172.2168.4176.7161.6160.8146.8NANANA
us-gaap:InventoryFinishedGoods ▇█▇▇▆▇▆▇██▇▇▆▆▆▇▇▅▄▅▃▃▂▄▄▄▃▄▃▃▂▃▂▁▁▂▃▂▂▂▂142.8149.2143.4143.0134.3142.8136.8140.2154.5150.0137.6142.7129.7134.7134.6138.4138.5116.8114.1118.0101.392.785.7106.8111.1108.7100.2106.6102.796.788.897.291.378.674.485.792.088.785.690.984.9NA72.7NANANA
us-gaap:InventoryLIFOReserve ▇▇▇▇▇▇▇████▇▇▇▇▆▆▆▆▅▅▆▆▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▁24.324.324.323.823.823.823.830.530.630.630.622.422.422.422.218.718.718.418.49.79.715.715.819.921.023.923.921.221.321.321.323.023.023.023.025.125.125.126.723.0-23.0NA-23.0NANANA
us-gaap:OtherAssetsCurrent █▅▅▅▆▆▇█▇▅▄█▇█▇▆▅▄▄▆▆▅▅▅▅▅▆▄▃▃▂▂▂▃▂▂▂▂▂▂▂▁▁66.445.443.345.853.854.556.566.560.946.341.566.661.963.557.251.045.642.037.652.950.148.045.946.344.147.352.938.232.932.727.425.825.928.322.326.423.123.021.523.723.819.917.4NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NoncurrentAssets NANA672.0NANANA673.2NANANA625.9NANANA604.1NANANA528.2NANANA478.3NANANA455.9NANANA424.6NANANA375.0NANANA341.8NANANA283.7NANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical aos:OtherForeignNANA43.4NANANA42.1NANANA42.9NANANA47.1NANANA48.4NANANA55.2NANANA58.3NANANA46.4NANANA35.9NANANA32.0NANANA31.2NANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical country:CANANA4.5NANANA4.2NANANA3.1NANANA3.2NANANA3.1NANANA2.7NANANA3.6NANANA4.7NANANA20.4NANANA20.9NANANA22.2NANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical country:CNNANA268.3NANANA266.7NANANA252.6NANANA250.8NANANA184.3NANANA145.2NANANA131.9NANANA134.9NANANA99.6NANANA70.7NANANA57.1NANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical country:USNANA355.8NANANA360.2NANANA327.3NANANA303.0NANANA292.4NANANA275.2NANANA262.1NANANA238.6NANANA219.1NANANA218.2NANANA173.2NANANA
us-gaap:PropertyPlantAndEquipmentGross ████▇▇▇▇▇▇▇▆▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▁▁▁1246.11227.11222.61195.91170.51159.51156.91137.51138.31121.61096.81071.21079.61085.11060.11017.4975.2951.6932.5919.8899.5888.3866.8855.5840.8826.8815.9802.8789.1777.5758.8728.0703.6690.5680.6656.8641.6628.5614.0601.7553.2541.3524.9NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ███▇▇▇▆▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁706.4688.0681.3658.8636.7622.2611.5593.9584.4571.7556.8544.9546.8547.0531.2515.7499.4484.0470.6461.4447.8437.7424.1416.7407.4396.4388.2381.8372.6375.2367.5356.3349.9344.5334.9325.7316.3308.6298.7293.0286.9278.5266.5NANANA
us-gaap:PropertyPlantAndEquipmentNet ███████████▇██▇▇▆▆▆▆▆▆▅▅▅▅▅▅▅▄▄▄▃▃▃▃▃▂▂▂▁▁▁539.7539.1541.3537.1533.8537.3545.4543.6553.9549.9540.0526.3532.8538.1528.9501.7475.8467.6461.9458.4451.7450.6442.7438.8433.4430.4427.7421.0416.5402.3391.3371.7353.7346.0345.7331.1325.3319.9315.3308.7266.3262.8258.4NANANA
us-gaap:Goodwill █████████▇▇▇▇▇▇▇▆▆▆▆▄▄▄▄▄▄▄▄▄▄▄▄▄▅▄▅▄▄▄▄▁▁▁547.9547.3546.8544.8544.0542.6546.0547.4547.9513.9513.0515.2514.7515.7516.7516.3493.1491.8491.5491.8423.4423.4420.9422.5425.4424.6428.8430.7433.3431.5433.5434.9433.8436.0435.4435.9434.0435.1433.8427.8325.7325.3323.8NANANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass us-gaap:TradeNamesNANA184.0NANANA183.8NANANA164.1NANANA165.2NANANA163.1NANANA141.2NANANA143.7NANANA145.2NANANANANANANANANANANANANANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▇▇▇▇▇▇███▆▆▆▆▇▇▇▇▇▇▇▆▆▆▆▆▇▇▇▇▇▇▇▇▇██████▁▁▁318.0320.9323.9325.8329.5333.1338.4339.5343.7289.9293.1297.4300.8304.7308.7312.3302.3305.1308.3311.8285.4288.5291.0295.1299.9303.3308.5312.9317.6320.4324.8329.2332.4337.2338.7342.6345.5349.6352.7355.7104.0105.5106.6NANANA
us-gaap:FiniteLivedIntangibleAssetsNet NANA139.9NANANA154.6NANANA129.0NANANA143.5NANANA145.2NANANA149.8NANANA164.8NANANA179.6NANANA192.2NANANA206.8NANANA63.7NANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:CustomerListsNANA139.9NANANA154.4NANANA128.6NANANA142.5NANANA143.7NANANA148.5NANANA163.1NANANA177.5NANANA189.8NANANA203.6NANANA60.0NANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▄▁▂▅▄▆██42.044.241.642.245.244.946.948.348.4NA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent █▇▆▇▆▆▆▆▆▆▆▆▆▆▅▅▅▅▅▃▄▄▂▁▁▁▁▁▁▁▂▃▃▂▂▂▁▂▂▂▂▂▂106.997.189.190.987.382.680.984.785.182.086.987.683.779.376.276.272.570.267.354.862.762.236.630.031.130.731.327.429.428.836.348.149.742.136.237.333.038.938.539.137.137.236.8NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AccruedLiabilitiesCurrent ▇█▇▇█▇▆▅▅▆▅▄▄▅▄▃▃▄▄▃▃▃▃▄▃▃▃▃▂▃▃▂▂▁▁▂▂▃▂▃▁▂▁166.4181.2161.9166.1188.4159.7143.7135.9137.0148.4120.4111.9116.3136.6110.799.791.5116.7101.097.692.799.190.2100.991.986.285.190.880.591.881.275.371.251.358.762.575.290.777.285.855.669.053.3NANANA
us-gaap:ContractWithCustomerLiabilityCurrent █▆█▅▃▅▃▃▁▂▃92.977.790.068.743.065.249.643.729.033.747.0NANANA56.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesCurrent █▇█▆▅▅▆▅▅▅▆▅▆▆▆▅▅▅▆▄▃▃▄▄▃▃▃▃▂▂▃▂▁▁▂▁▁▂▂▄▂▃▂907.0836.1886.3805.9735.4699.1766.5730.4730.6737.2785.3738.9768.7766.9788.5731.7705.8720.5765.6682.1615.6602.0653.2624.1579.1595.8605.2587.3550.0536.5590.9535.2490.1477.1499.0462.8459.4502.4519.9619.7535.9555.4536.8NANANA
us-gaap:LongTermDebtCurrent ▄▄▄▄▄▄▄6.86.86.86.86.86.86.8NANANA0.0NA2.77.47.57.57.47.27.27.37.413.212.913.113.448.613.713.814.214.014.214.48.618.618.618.618.618.618.618.618.618.618.6NANANA
us-gaap:OperatingLeaseLiabilityCurrent ▇█▁▁▃▃▆12.212.311.111.111.511.512.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:LongTermDebt NANA113.2NANANA284.0NANANA221.4NANANA410.4NANANA323.6NANANA249.0NANANA223.8NANANA191.9NANANA243.7NANANA461.6NANANA261.0NANANA
 us-gaap:LongTermDebt us-gaap:LongtermDebtType aos:TermNotesWithInsuranceCompaniesNANA113.2NANANA120.0NANANA120.0NANANA122.7NANANA125.5NANANA89.0NANANA22.6NANANA31.2NANANA49.8NANANA68.3NANANA86.9NANANA
us-gaap:LongTermDebtNoncurrent ▁▁▁▁▅▆▅▅▆▅▃▃▄▅▇█▆▆▅▆▅▅▄▄▄▄▃▄▄▃▃▃▃▃▄▄▄▅█▇▆▆▄99.699.6106.4107.1274.3335.6277.2312.4351.8277.6221.4193.3245.4285.8402.9442.2367.7362.2316.4328.9274.6274.1236.1247.7266.2255.3210.1240.7236.2213.0177.7213.4200.7210.5225.1261.0266.0300.6443.0376.3356.9321.2242.4NANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:OtherPostretirementBenefitPlansDefinedBenefitNANA5.4NANANA7.5NANANA6.5NANANA7.3NANANA6.2NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:PensionPlansDefinedBenefitNANA13.4NANANA27.6NANANA49.2NANANA47.4NANANA108.3NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▅▅▄▇▇▇▅▇▇█▅███▅▅▅▅▂▅▄▄▁▅▅▄▁▄▄▄▁▄▄▄▁▄▄▄▁▄▄▄▁188.3190.3177.2266.0265.1273.9188.6292.8291.2295.1200.7312.0306.6304.6211.1198.8194.0188.788.3192.6170.1167.657.6187.8185.1180.260.7176.1178.0179.762.6159.6156.4149.452.1157.5153.9156.149.3149.5152.2147.361.9NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▇▇▇▇▇▇████▁33.935.834.434.937.537.338.739.639.941.10.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo ▁▁█▇6.96.710.29.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree █▄▄▁5.85.65.65.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour ▂▁█▆4.14.04.64.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA2.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA21.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity ███▆▅▅▅▅▆▇▆▇▆▆▅▅▅▄▃▃▃▃▂▂▂▁▁▁1816.31849.01848.31747.11658.11616.31666.81656.21725.11749.21717.01756.21730.31708.41648.81665.91613.71566.41515.31525.61480.71478.51442.31422.41436.51405.11381.31375.2NANA1328.7NANANANANANANANANANANANANANANA
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock aos:CommonStockClassUndefined██▁▁164.7164.7164.6164.6NANA164.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassA████████████████████▁▁▁▁▁▁▁▁▁▁▁130.6130.6130.8130.8130.9130.9130.9130.9130.9131.0131.0131.0131.0131.0131.2131.2131.2131.4131.6131.865.965.965.966.066.166.166.166.266.266.266.4NANANA66.6NANANANANANANANANANANA
us-gaap:AdditionalPaidInCapitalCommonStock ▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▇▇▇▆▆▆▆▆▆▆▅▅▅▅█████████535.0528.7520.4518.7517.1516.1509.0507.3506.7503.5496.7495.8494.2491.6486.5485.7484.4482.5477.6476.1622.6619.6617.4613.8609.8607.7600.1599.4597.2593.9589.7588.3586.0583.1654.8653.5652.3651.0652.5651.5650.9648.0655.7NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ███▇▇▇▇▇▇▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁2641.62565.12509.62431.82365.12336.12323.42271.52220.22155.02102.82014.01940.11856.51792.61794.01724.51656.41593.01531.21469.11403.01350.71287.71231.01176.91135.51095.81058.81015.2982.2950.7915.7884.9855.1825.2797.5770.0729.9705.2530.4486.6452.1NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▄▃▃▂▁▁▂▁▂▃▂▃▄▆▄▃▂▂▁▃▃▄▄▅▆▅▆▇▆▆▆▄▃▄▃▄▄▄▄▇███-311.2-320.8-321.2-336.5-355.8-362.4-348.3-361.6-338.4-332.1-350.8-318.2-304.4-275.7-299.5-322.4-340.7-352.2-363.2-324.8-323.5-304.3-313.4-290.5-276.0-277.6-272.0-254.5-258.9-263.3-259.1-309.3-318.7-315.0-320.5-302.1-304.7-298.7-300.9-252.9-228.8-229.4-229.4NANANA
us-gaap:TreasuryStockValue █▇▇▇▇▇▇▆▆▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁1344.41219.31155.91162.31163.71168.91112.71056.4958.8872.7827.2730.9695.1659.5626.5587.1550.2516.1488.1453.1435.6387.9360.5336.8276.5250.1230.5213.8188.7150.7132.6125.775.065.969.659.561.655.972.457.059.460.974.6NANANA
 us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▁▇▁▁▁█▁▁▂█▁▁▁▆1.17.21.11.11.48.81.31.11.98.61.11.31.46.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃▄█▅▄▂▆▅▄▁▆▄▅▂▆▃91.6104.4231.7151.1125.254.1176.2136.3122.121.6159.7116.0130.043.2176.277.0NANA183.0108.5128.626.5113.1173.161.6-3.4100.174.078.011.891.683.069.235.870.170.17.1-3.5128.117.8-35.0-52.255.918.265.1-14.4
us-gaap:NetCashProvidedByUsedInInvestingActivities ▃▅▅▄▅▆█▄▁▇▄▄▅▆▃▃-62.512.5-0.6-11.8-2.226.4109.7-23.8-129.877.8-27.1-19.7-0.834.9-46.6-75.3NANANANANANANANANANANANANANA-33.1-31.329.426.8-32.3-36.7-66.748.9-147.4299.0-10.5-15.5-22.0-27.2-7.0-10.3
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂▄▆▁▄▆▃▂▆▇▄▄▄▂▄█-162.8-111.5-35.9-204.1-96.4-38.4-131.3-174.7-48.5-21.3-105.9-123.3-111.1-182.8-104.913.6NANANANANANANANANANANANANANA-51.9-43.7-39.4-22.6-50.5-13.4-48.0-141.642.115.629.573.0-24.124.1-43.928.2
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▁▄█▂▄▅▇-133.700000000000025.4195.2-64.826.642.1154.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:DepreciationDepletionAndAmortization ▇▇▇████▇▆█▇▆▆▆▆▆▆▆▅▆▅▅▅▅▅▅▅▄▄▄▆▄▄▄▄▄▃▄▄▂▂▂▂▁▁▂19.519.519.320.719.920.120.219.718.220.218.717.817.517.918.217.617.416.916.416.615.916.215.715.716.015.615.414.814.814.817.514.213.914.114.213.913.113.413.811.411.010.811.510.09.210.1
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃▄█▅▄▂▆▅▄▁▆▄▅▂▆▃91.6104.4231.7151.1125.254.1176.2136.3122.121.6159.7116.0130.043.2176.277.0NANA183.0108.5128.626.5113.1173.161.6-3.4100.174.078.011.891.683.069.235.870.170.17.1-3.5128.117.8-35.0-52.255.918.265.1-14.4
us-gaap:NetIncomeLoss ▇▆█▇▄▃▆▅▆▆█▇▇▆▁▆▆▅▅▅▅▄▅▄▄▃▃▃▃▃▂▃118.297.7120.0105.467.851.791.387.3102.189.3126.3104.6114.598.822.793.792.487.782.783.287.173.579.873.671.158.453.250.657.346.742.446.2NANANANANANA32.1182.350.341.032.232.016.630.9
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▃▅▅▄▅▆█▄▁▇▄▄▅▆▃▃-62.512.5-0.6-11.8-2.226.4109.7-23.8-129.877.8-27.1-19.7-0.834.9-46.6-75.3NANANANANANANANANANANANANANA-33.1-31.329.426.8-32.3-36.7-66.748.9-147.4299.0-10.5-15.5-22.0-27.2-7.0-10.3
us-gaap:PaymentsToAcquireProductiveAssets ▃▄▅▂▂▂▃▃▃▅▆▄▅▄▇▇▄▄▅▅▄▄▄▅▃▃▅▃▆▆█▇▄▄▆▃▄▃▄▂▂▂▃▅▁▁13.617.120.111.912.012.814.113.815.620.926.719.022.217.327.830.119.516.822.021.018.319.419.622.116.114.920.115.225.525.332.027.519.818.425.414.217.213.116.812.411.912.416.321.18.47.7
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂▄▆▁▄▆▃▂▆▇▄▄▄▂▄█-162.8-111.5-35.9-204.1-96.4-38.4-131.3-174.7-48.5-21.3-105.9-123.3-111.1-182.8-104.913.6NANANANANANANANANANANANANANA-51.9-43.7-39.4-22.6-50.5-13.4-48.0-141.642.115.629.573.0-24.124.1-43.928.2
us-gaap:RepaymentsOfLongTermDebt ▁▁▁█0.06.80.7167.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsOfDividendsCommonStock ███▇▇▇▇▇▇▇▇▆▆▆▅▅▅▅▄▄▄▄▃▃▃▃▂▂▂▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁41.742.242.238.738.839.039.236.036.937.137.630.730.831.024.124.224.224.421.021.021.021.216.916.916.917.113.413.613.613.811.011.111.19.49.29.27.57.37.47.46.56.46.46.46.05.9
us-gaap:PaymentsForRepurchaseOfCommonStock █▅▁▁▁▄▄▆▆▃▆▃▃▃▃▃▃▃▃▂▄▃▂▄▂▂▂▂▃▂▁▄▂▁▂▁131.167.00.00.00.056.757.797.487.045.696.636.336.633.135.837.136.130.135.018.051.730.523.857.026.620.717.225.839.521.37.252.510.53.512.30.0NANA17.80.0NANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

aos:CommonStockClassUndefined


Common
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value164164164164164
Percentage of CommonStockValue100.0100.0100.0100.0100.0
Percentage of Assets5.25.35.25.55.4
Percentage of Assets aos:CommonStockClassUndefined0.00.00.00.00.0

us-gaap:CommonClassA


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value130130130130130130130130130131131131131131131131131131131131656565666666666666666666
Percentage of CommonStockValue79.379.379.579.50.00.079.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets4.24.24.14.44.44.44.34.34.14.24.34.34.24.24.14.24.44.54.64.72.52.52.52.52.62.62.62.72.72.82.82.9
Percentage of Assets us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value1611621621621621651681691721721731741741753531761771781791801811821831851861869393929393939292
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value1601611611611611641661671701711711721721733481741751771781781791811821841851859292929292929191
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.740.60.740.650.420.320.560.530.610.530.750.610.670.580.130.540.530.510.480.240.50.420.4550.4150.40.3250.2950.280.3150.2550.230.250.2250.210.4250.40.380.5150.3451.970.5450.4450.350.350.180.34
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.730.60.740.650.420.320.560.530.610.530.740.610.660.570.130.540.530.50.470.2350.490.4150.450.410.3950.3250.2950.280.3150.2550.230.250.2250.210.4250.3950.3750.510.3451.9550.540.440.3450.3450.180.335
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1.57.41.21.11.49.01.01.52.18.70.41.81.46.51.41.31.35.91.31.21.85.11.11.01.15.61.21.82.05.81.72.42.44.01.51.51.4
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.21.00.10.10.21.40.10.20.31.20.00.20.20.80.20.20.20.80.20.20.30.80.20.20.20.90.20.30.31.10.30.40.40.80.30.30.3

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value127981351247437104649510893908512245112103984481678256597252355561429255384420392949-15.9158514131416.7
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.912.816.216.411.25.913.98.812.514.411.512.010.315.65.914.914.113.36.312.010.213.08.99.511.18.55.79.510.47.716.610.47.08.74.08.66.010.6-3.338.412.69.88.511.11.8

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value538480510462416397455444456455475448492466446444434
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax62.662.561.260.962.762.460.761.059.760.958.559.459.159.258.159.358.8

Gross Profit

us-gaap:GrossProfit

us-gaap:GrossProfit


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value321288324297247239295284308292337306341321323306305302289283283262262256263229231215216195199196198179185156160149155118111127116107114108
Percentage of GrossProfit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax37.437.538.839.137.337.639.339.040.339.141.540.640.940.842.140.941.440.941.541.442.541.241.141.140.337.137.037.036.335.535.836.736.135.235.433.933.131.832.628.827.630.431.428.430.529.5

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value15112615113787671151121321111541311461251401311281201161181241031091071038273695761525069823941338723-6.6
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.616.418.218.113.110.615.415.517.314.919.117.417.515.918.317.517.316.316.717.318.616.317.117.115.813.411.811.911.211.711.310.514.917.29.710.18.123.66.2-1.8

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-112013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value33283131191624253022282631261183735323335373029333224201821181415194.218181515221512129.58.27.1-5.77.7
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.83.73.84.22.92.53.23.53.93.03.53.63.83.415.45.14.84.44.85.15.54.74.65.44.93.93.33.23.63.32.62.83.50.03.63.53.23.24.83.33.13.12.32.21.9-1.52.1

us-gaap:IncomeTaxExpenseBenefit us-gaap:RestructuringCostAndReserve

us-gaap:RestructuringCharges


Income
Period End2020-09-302020-06-30
Value-0.3-1.1
Percentage of IncomeTaxExpenseBenefit-0.9-5.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.0-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RestructuringCharges0.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.91.01.01.62.52.22.53.13.42.01.82.02.32.32.92.52.52.21.62.11.91.71.41.62.51.91.41.51.41.41.21.41.61.52.11.92.23.02.92.52.11.81.91.71.61.7
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.20.40.30.30.40.40.30.20.30.30.30.40.30.30.30.20.30.30.30.20.30.40.30.20.30.20.30.20.30.30.30.40.40.50.60.60.60.50.40.50.50.40.5

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1189712010567519187102891261041149822939287828387737973715853505746424632182504132321630
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.712.714.413.910.28.112.212.013.311.915.513.913.712.53.012.512.511.911.812.213.111.512.511.810.99.48.58.79.68.57.68.66.744.212.49.88.78.54.48.4

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value11897120105675191871028912610411498
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.712.714.413.910.28.112.212.013.311.915.513.913.712.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value16414216914999841291251451281671441591421551441411361271311371181201171169789839280717877727663635658394948
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.118.520.319.715.013.317.317.319.017.120.619.219.218.020.319.219.218.518.319.220.618.618.918.917.915.714.314.315.514.612.814.614.114.214.513.713.112.012.39.712.211.7

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination


Operating
Period End2020-12-312020-09-302020-06-302019-09-302019-06-302018-03-312017-09-302017-06-302017-03-312016-03-312013-09-30
Value0.00.0-0.30.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of OperatingIncomeLoss0.00.0-0.30.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.0-0.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination0.0-0.04.8-0.01.31.31.61.91.52.31.1

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, aos:NorthAmericaSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value141130137133105127128121122116127105124106104110109104891001049192908671675363555151
Percentage of OperatingIncomeLoss86.491.781.588.9106.1149.798.896.784.690.476.473.078.374.667.476.677.176.370.176.475.977.476.476.873.673.175.163.968.368.871.465.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.517.016.517.515.920.017.116.716.115.515.714.015.013.513.614.714.814.112.814.715.614.414.414.513.211.510.79.110.610.09.29.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments aos:NorthAmericaSegment23.523.60.024.521.923.90.023.623.522.20.021.723.421.10.022.723.221.40.022.324.121.70.021.719.416.60.013.515.414.20.013.9

us-gaap:OperatingSegments, aos:RestOfWorld


Operating
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value221116-5.8-42.21.44.1221239393436503332323831332628273026223029252026
Percentage of OperatingIncomeLoss13.68.311.1-5.8-49.71.13.315.49.623.627.021.725.432.423.523.023.829.923.624.122.723.623.226.426.925.036.131.731.228.434.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.61.52.2-0.9-6.60.20.62.91.64.95.24.24.66.64.54.44.45.54.54.94.24.54.44.74.23.65.24.94.53.75.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments aos:RestOfWorld8.55.37.5-3.1-38.30.01.99.05.30.014.311.312.30.012.511.912.50.012.913.812.40.012.614.013.40.015.115.114.50.015.4

Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value900000.0-2000000.0200000.0700000.0-800000.0300000.0600000.0-300000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.1-0.30.00.1-0.10.00.1-0.0

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value4.9-1.416153.7-18.014-21.9-10.115-5.1-20.7-31.0181417137.3-27.8-3.5-17.18.6-14.7-17.8-0.9-9.3-7.4-1.52.7-10.42.43.6-4.1-1.5-0.16.1-5.82.82.4-16.03.2
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.6-0.22.02.10.6-2.82.0-3.0-1.32.1-0.6-2.7-3.72.31.92.31.81.0-4.0-0.5-2.61.4-2.3-2.8-0.1-1.5-1.2-0.30.5-1.90.40.7-0.7-0.3-0.01.3-1.20.60.5-3.90.8

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax us-gaap:StatementGeographical, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:NonUs, us-gaap:NetInvestmentHedging


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-0.10.0-3.0-0.80.10.8-1.82.71.31.30.04.17.4
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax-2.0-0.0-18.0-5.12.7-4.4-12.2-12.3-12.98.2-0.0-19.8-23.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.00.0-0.4-0.10.00.1-0.20.40.20.20.00.50.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NonUs us-gaap:NetInvestmentHedging0.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.95.00.02.84.04.22.94.05.65.55.75.14.65.82.93.21.92.43.21.92.32.03.22.22.72.71.71.01.21.31.01.10.71.01.82.21.2291.1155.1-2.21.5-0.3-1.2-0.5
Percentage of OtherNonoperatingIncomeExpense100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.70.00.40.60.70.40.50.70.70.70.70.60.70.40.40.30.30.50.30.30.30.50.40.40.40.30.20.20.20.20.20.10.20.30.50.26.20.23.81.3-0.50.4-0.1-0.3-0.1

us-gaap:OtherNonoperatingIncomeExpense us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value-11.8-15.1-16.3-10.9-9.8-15.0-11.9-9.8-9.6-14.7-10.5-11.2-11.2-14.3-82.09.9-11.1-14.0-9.6-11.1-11.2-13.4-76.09.1-11.2-12.7-14.2-12.2-12.5-14.1-13.9-15.6-14.5
Percentage of OtherNonoperatingIncomeExpense-302.6-302.00.0-389.3-245.0-357.1-410.3-245.0-171.4-267.3-184.2-219.6-243.5-246.6-2827.6309.4-584.2-583.3-300.0-584.2-487.0-670.0-2375.0413.6-414.8-470.4-835.3-1220.0-1041.7-1084.6-1390.0-1418.2-2071.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.4-2.0-2.0-1.4-1.5-2.4-1.6-1.3-1.3-2.0-1.3-1.5-1.3-1.8-10.71.3-1.5-1.9-1.4-1.6-1.7-2.1-11.91.5-1.7-2.1-2.3-2.1-2.1-2.6-2.5-2.9-2.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value859769834760663636750728765748812754833788768749738740698683667636639625653618626581595552558536549509524462484468475412405417370377375366
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value-7.0-6.2-5.4-5.4-6.3-6.2-6.5-6.7-7.7-5.7-7.0-6.9-9.0-7.5-6.1-6.2-5.3-6.8-5.6-7.2-5.6-4.4-6.1-9.4-10.5-6.6-7.3-9.3-8.3-9.1-8.3-9.1-9.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.8-0.8-0.6-0.7-0.9-1.0-0.9-0.9-1.0-0.8-0.9-0.9-1.1-1.0-0.8-0.8-0.7-0.9-0.8-1.1-0.8-0.7-1.0-1.5-1.6-1.1-1.2-1.6-1.4-1.6-1.5-1.7-1.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.8-0.8-0.6-0.7-0.9-1.0-0.9-0.9-1.0-0.8-0.9-0.9-1.1-1.0-0.8-0.8-0.7-0.9-0.8-1.1-0.8-0.7-1.0-1.5-1.6-1.1-1.2-1.6-1.4-1.6-1.5-1.7-1.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, aos:BoilersAndRelatedParts, aos:NorthAmericaSegment


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
Value554649554141486048425758473650564332
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.56.05.97.36.26.56.58.36.35.77.17.85.74.76.57.65.94.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.56.05.97.36.26.56.58.36.35.77.17.85.74.76.57.65.94.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments aos:BoilersAndRelatedParts aos:NorthAmericaSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, aos:WaterHeatersAndRelatedParts, aos:NorthAmericaSegment


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
Value498457466442396447432415438455438405466446389415413444
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax57.959.555.958.259.870.357.557.157.360.954.053.755.956.750.755.456.160.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax57.959.555.958.259.870.357.557.157.360.954.053.755.956.750.755.456.160.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments aos:WaterHeatersAndRelatedParts aos:NorthAmericaSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, aos:WaterTreatmentProducts, aos:NorthAmericaSegment


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
Value504845454243423837232523201821131310
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.86.35.46.06.46.85.65.34.83.13.23.12.52.32.81.81.81.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.86.35.46.06.46.85.65.34.83.13.23.12.52.32.81.81.81.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments aos:WaterTreatmentProducts aos:NorthAmericaSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, aos:NorthAmericaSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value603552560544480532523514524521521486534501460486470487435450432423413417442429430392410388382370
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax70.271.967.271.672.483.769.770.768.569.764.264.664.163.760.064.863.865.962.465.964.966.664.766.867.769.468.767.568.970.468.469.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax70.271.967.271.672.483.769.770.768.569.764.264.664.163.760.064.863.865.962.465.964.966.664.766.867.769.468.767.568.970.468.469.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments aos:NorthAmericaSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, aos:RestOfWorld


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value263222279221189110234220249232297274308293313270272259268240239217231217221195203198193172185175
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.628.933.429.128.617.331.230.332.531.036.636.337.037.340.836.037.035.138.435.136.034.136.334.733.931.732.534.132.531.333.132.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.628.933.429.128.617.331.230.332.531.036.636.337.037.340.836.037.035.138.435.136.034.136.334.733.931.732.534.132.531.333.132.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments aos:RestOfWorld100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, aos:AllOtherRestOfWorld, aos:RestOfWorld


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value2423332917193330241933272318302318
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.83.04.03.92.63.04.54.23.32.64.13.72.82.34.03.12.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.83.04.03.92.63.04.54.23.32.64.13.72.82.34.03.12.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments aos:AllOtherRestOfWorld aos:RestOfWorld100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, country:CN, aos:RestOfWorld


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value23819924519217291200189224213264246284275283247254
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.825.929.425.326.014.326.726.029.328.532.532.634.135.036.932.934.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.825.929.425.326.014.326.726.029.328.532.532.634.135.036.932.934.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments country:CN aos:RestOfWorld100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value17316617115915517317917217818418617719719218317517718217416416015915315016014715814513713013913313112012411110810510692858986818377
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.121.720.521.023.527.324.023.723.324.722.923.623.724.523.823.424.024.625.024.124.025.023.924.024.523.825.325.023.123.724.924.924.023.523.824.122.522.522.322.421.021.423.221.722.321.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value31403106316029712984298330583067317531433071302530853106319731042984294028912824267226502646260025892565251524862430238123912348229522672265223521912250234923582143220521121974
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value736606696863790721633567552
Percentage of Assets23.319.822.727.027.427.325.223.724.4
Percentage of Assets23.319.822.727.027.427.325.223.724.4
Percentage of Assets us-gaap:CorporateNonSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, aos:NorthAmericaSegment


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value1759174216531592151513811358
Percentage of Assets55.757.053.849.852.452.254.0
Percentage of Assets55.757.053.849.852.452.254.0
Percentage of Assets us-gaap:OperatingSegments aos:NorthAmericaSegment100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, aos:RestOfWorld


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value664709721741584544523
Percentage of Assets21.023.223.523.220.220.620.8
Percentage of Assets21.023.223.523.220.220.620.8
Percentage of Assets us-gaap:OperatingSegments aos:RestOfWorld100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value13231257131212241326136613911411145013941354126913551398154814381370137313751298119111721204117711531160113411111074103710621096103810311071104310331109126312351173128312301184
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets42.240.541.541.244.445.845.546.045.744.444.141.943.945.048.446.345.946.747.646.044.644.245.545.344.545.245.144.744.243.644.446.745.345.547.346.747.249.353.852.454.758.258.360.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value31403106316029712984298330583067317531433071302530853106319731042984294028912824267226502646260025892565251524862430238123912348229522672265223521912250234923582143220521121974
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value18161849184817471658161616661656172517491717175617301708164816651613156615151525148014781442142214361405138113751328
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets57.859.558.558.855.654.254.554.054.355.655.958.156.155.051.653.754.153.352.454.055.455.854.554.755.554.854.955.355.6

us-gaap:StockholdersEquity us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

aos:CommonStockClassUndefined, us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-31
Value164164164164164164164164164164164
Percentage of StockholdersEquity9.18.98.99.49.910.29.99.99.59.610.0
Percentage of Assets5.25.35.25.55.55.55.45.45.25.45.1
Percentage of Assets aos:CommonStockClassUndefined us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonClassA, us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-31
Value130130130130130130130130130131131
Percentage of StockholdersEquity7.27.17.17.57.98.17.97.97.67.68.0
Percentage of Assets4.24.24.14.44.44.44.34.34.14.34.1
Percentage of Assets us-gaap:CommonClassA us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-266.1-269.9-273.7-272.1-275.0-278.7-282.3-280.2-279.2-282.3-285.2-259.6-265.2-268.7-272.1-280.6-283.2-281.6-284.2-272.9-275.3-272.7-275.2-267.3-270.0-273.7-276.2
Percentage of StockholdersEquity-14.7-14.6-14.8-15.6-16.6-17.2-16.9-16.9-16.2-16.1-16.6-14.8-15.3-15.7-16.5-16.8-17.5-18.0-18.8-17.9-18.6-18.4-19.1-18.8-18.8-19.5-20.0
Percentage of Assets-8.5-8.7-8.7-9.2-9.2-9.3-9.2-9.1-8.8-9.0-9.3-8.6-8.6-8.6-8.5-9.0-9.5-9.6-9.8-9.7-10.3-10.3-10.4-10.3-10.4-10.7-11.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value-0.5-1.40.60.4-0.30.50.2-0.4-0.1-0.8-0.71.2-0.11.1-0.9-0.80.81.30.2
Percentage of StockholdersEquity-0.0-0.10.00.0-0.00.00.0-0.0-0.0-0.0-0.00.1-0.00.1-0.1-0.00.00.10.0
Percentage of Assets-0.0-0.00.00.0-0.00.00.0-0.0-0.0-0.0-0.00.0-0.00.0-0.0-0.00.00.00.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-311.2-320.8-321.2-336.5-355.8-362.4-348.3-361.6-338.4-332.1-350.8-318.2-304.4-275.7-299.5-322.4-340.7-352.2-363.2-324.8-323.5-304.3-313.4-290.5-276.0-272.0-259.1
Percentage of StockholdersEquity-17.1-17.3-17.4-19.3-21.5-22.4-20.9-21.8-19.6-19.0-20.4-18.1-17.6-16.1-18.2-19.4-21.1-22.5-24.0-21.3-21.8-20.6-21.7-20.4-19.2-19.7-19.5
Percentage of Assets-9.9-10.3-10.2-11.3-11.9-12.1-11.4-11.8-10.7-10.6-11.4-10.5-9.9-8.9-9.4-10.4-11.4-12.0-12.6-11.5-12.1-11.5-11.8-11.2-10.7-10.8-10.8
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-44.6-49.5-48.1-64.8-80.5-84.2-66.2-81.0-59.1-49.0-64.9-59.8-39.1-8.1-26.5-41.0-58.3-71.9-79.2-51.4-47.9-30.8-39.4-24.7-6.9-6.03.3
Percentage of StockholdersEquity-2.5-2.7-2.6-3.7-4.9-5.2-4.0-4.9-3.4-2.8-3.8-3.4-2.3-0.5-1.6-2.5-3.6-4.6-5.2-3.4-3.2-2.1-2.7-1.7-0.5-0.40.2
Percentage of Assets-1.4-1.6-1.5-2.2-2.7-2.8-2.2-2.6-1.9-1.6-2.1-2.0-1.3-0.3-0.8-1.3-2.0-2.4-2.7-1.8-1.8-1.2-1.5-0.9-0.3-0.20.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value535528520518517516509507506503496495494491486477469451441
Percentage of StockholdersEquity29.528.628.229.731.231.930.530.629.428.828.928.228.628.829.531.532.532.733.2
Percentage of Assets17.017.016.517.517.317.316.616.516.016.016.216.416.015.815.216.517.718.018.4
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value264125652509243123652336232322712220215521022014194018561792159313501135982
Percentage of StockholdersEquity145.4138.7135.8139.2142.6144.5139.4137.2128.7123.2122.5114.7112.1108.7108.7105.193.682.273.9
Percentage of Assets84.182.679.481.879.378.376.074.069.968.668.566.662.959.856.155.151.045.141.1
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value-1344.4-1219.3-1155.9-1162.3-1163.7-1168.9-1112.7-1056.4-958.8-872.7-827.2-730.9-695.1-659.5-626.5-488.1-360.5-230.5-132.6
Percentage of StockholdersEquity-74.0-65.9-62.5-66.5-70.2-72.3-66.8-63.8-55.6-49.9-48.2-41.6-40.2-38.6-38.0-32.2-25.0-16.7-10.0
Percentage of Assets-42.8-39.2-36.6-39.1-39.0-39.2-36.4-34.4-30.2-27.8-26.9-24.2-22.5-21.2-19.6-16.9-13.6-9.2-5.5
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1585155816181430144414421500150415961658163815981653166917661698164016051562150714491425145514131400137613191294123311981205116511251105110710881053110612081227991987896740
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets50.550.251.248.148.448.449.149.050.352.753.352.853.653.755.354.755.054.654.053.454.253.855.054.454.153.752.452.150.850.350.449.649.048.848.948.748.149.251.552.046.344.842.437.5

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value4445785733774424163742192813372592332602413463213062933302692873053232822482843194003933693803743663062662792593674634401081241181099479763555
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets14.218.618.112.714.813.912.27.28.910.78.57.78.47.810.810.410.310.011.49.510.811.512.210.99.611.112.716.116.215.515.915.916.013.511.812.511.816.319.718.75.05.65.60.00.00.03.90.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312017-12-31
Value444578573377442416374219259346
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets14.218.618.112.714.813.912.27.28.510.8

Marketable Securities Current

us-gaap:MarketableSecuritiesCurrent

us-gaap:MarketableSecuritiesCurrent


Marketable
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
Value1378711613112613517729429629538538439843747344643442842440937933532132330429022212310210210510297144196
Percentage of MarketableSecuritiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.42.83.74.44.24.55.89.69.39.412.512.712.914.114.814.414.614.614.714.514.212.612.212.411.711.38.85.04.24.34.44.44.36.48.7

Receivables Net Current

us-gaap:ReceivablesNetCurrent

us-gaap:ReceivablesNetCurrent


Receivables
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value607534585572515524589614634658647606644638598587566584518517493506501479528495475474457455458436422423425369382386368369327362313275
Percentage of ReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets19.317.218.519.317.317.619.320.020.021.021.120.120.920.618.718.919.019.917.918.318.519.118.918.420.419.318.919.118.819.119.218.618.418.718.816.517.517.215.715.715.316.414.814.0

Inventory Net

us-gaap:InventoryNet

us-gaap:InventoryNet


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value330312300302306312303310323319304307289287291292287257251258237230222239233218208218206197193189178169163178177172168176161160146110
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.510.19.510.210.310.59.910.110.210.29.910.29.49.29.19.49.68.78.79.28.98.78.49.29.08.58.38.88.58.38.18.17.87.57.28.08.17.77.27.57.57.37.05.6

Inventory Finished Goods

us-gaap:InventoryFinishedGoods

us-gaap:InventoryFinishedGoods


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value142149143143134142136140154150137142129134134138138116114118101928510611110810010610296889791787485928885908472
Percentage of InventoryFinishedGoods100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.54.84.54.84.54.84.54.64.94.84.54.74.24.34.24.54.64.03.94.23.83.53.24.14.34.24.04.34.24.13.74.14.03.53.33.84.23.93.63.94.03.4

Inventory L I F O Reserve

us-gaap:InventoryLIFOReserve

us-gaap:InventoryLIFOReserve


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value242424232323233030303022222222181818189.79.715151921232321212121232323232525252623-23.0-23.0
Percentage of InventoryLIFOReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.80.80.80.80.80.81.01.01.01.00.70.70.70.70.60.60.60.60.30.40.60.60.80.80.91.00.90.90.90.91.01.01.01.01.11.11.11.11.0-1.1-1.1

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6645434553545666604641666163575145423752504845464447523832322725252822262323212323191724
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.11.51.41.51.81.81.82.21.91.51.42.22.02.01.81.61.51.41.31.91.91.81.71.81.71.82.11.51.41.41.11.11.11.21.01.21.11.00.91.01.10.90.81.2

Noncurrent Assets

us-gaap:NoncurrentAssets

us-gaap:NoncurrentAssets


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value672673625604528478455424375341283271
Percentage of NoncurrentAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets21.322.020.418.918.318.118.117.816.614.613.413.7

us-gaap:NoncurrentAssets us-gaap:StatementGeographical

aos:OtherForeign


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value434242474855584635323126
Percentage of NoncurrentAssets6.56.36.97.89.211.512.810.99.69.411.09.7
Percentage of Assets1.41.41.41.51.72.12.31.91.61.41.51.3
Percentage of Assets aos:OtherForeign0.00.00.00.00.00.00.00.00.00.00.00.0

country:CA


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value4.54.23.13.23.12.73.64.7202022
Percentage of NoncurrentAssets0.70.60.50.50.60.60.81.15.46.17.8
Percentage of Assets0.10.10.10.10.10.10.10.20.90.91.1
Percentage of Assets country:CA0.00.00.00.00.00.00.00.00.00.00.0

country:CN


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value268266252250184145131134997057
Percentage of NoncurrentAssets39.939.640.441.534.930.428.931.826.620.720.1
Percentage of Assets8.58.78.27.86.45.55.25.64.43.02.7
Percentage of Assets country:CN0.00.00.00.00.00.00.00.00.00.00.0

country:US


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value355360327303292275262238219218173
Percentage of NoncurrentAssets52.953.552.350.255.457.557.556.258.463.861.1
Percentage of Assets11.311.810.79.510.110.410.410.09.79.38.2
Percentage of Assets country:US0.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value1246122712221195117011591156113711381121109610711079108510601017975951932919899888866855840826815802789777758728703690680656641628614601553541524
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets39.739.538.740.339.238.937.837.135.835.735.735.435.034.933.232.832.732.432.332.633.733.532.832.932.532.232.432.332.532.731.731.030.730.530.029.429.327.926.125.525.824.524.9

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Building


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value349334323329286237230
Percentage of PropertyPlantAndEquipmentGross28.628.929.531.130.727.428.3
Percentage of Assets11.010.910.510.39.99.09.2
Percentage of Assets us-gaap:Building0.00.00.00.00.00.00.0

us-gaap:Equipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value729686643608533530504
Percentage of PropertyPlantAndEquipmentGross59.759.458.757.457.261.261.8
Percentage of Assets23.122.521.019.018.520.120.1
Percentage of Assets us-gaap:Equipment0.00.00.00.00.00.00.0

us-gaap:Land


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value11111111111011
Percentage of PropertyPlantAndEquipmentGross0.91.01.01.11.21.21.4
Percentage of Assets0.40.40.40.40.40.40.4
Percentage of Assets us-gaap:Land0.00.00.00.00.00.00.0

us-gaap:SoftwareDevelopment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value1321241181101018769
Percentage of PropertyPlantAndEquipmentGross10.810.710.810.410.910.18.5
Percentage of Assets4.24.13.93.53.53.32.8
Percentage of Assets us-gaap:SoftwareDevelopment0.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value706688681658636622611593584571556544546547531515499484470461447437424416407396388381372375367356349344334325316308298293286278266
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets22.522.121.622.221.320.920.019.418.418.218.118.017.717.616.616.616.716.516.316.316.816.516.016.015.715.515.415.415.315.815.415.215.215.214.814.614.413.712.712.413.412.612.6

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value539539541537533537545543553549540526532538528501475467461458451450442438433430427421416402391371353346345331325319315308266262258249
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.217.417.118.117.918.017.817.717.417.517.617.417.317.316.516.215.915.916.016.216.917.016.716.916.716.817.016.917.116.916.415.815.415.315.314.814.814.213.413.112.411.912.212.6

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-08-262011-06-302011-03-312010-12-312009-12-31
Value547547546544544542546547547513513515514515516516493491491491423423420422425424428430433431433434433436435435434435433427111325325323319
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.417.617.318.318.218.217.917.817.316.316.717.016.716.616.216.616.516.717.017.415.816.015.916.216.416.617.017.317.818.118.118.518.919.219.219.519.819.318.518.10.015.214.815.316.2

us-gaap:Goodwill us-gaap:StatementBusinessSegments

aos:NorthAmericaSegment


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value487486453457432361368372
Percentage of Goodwill89.289.288.588.587.985.885.986.0
Percentage of Assets15.415.914.814.314.913.614.715.6
Percentage of Assets aos:NorthAmericaSegment0.00.00.00.00.026.127.128.7

aos:RestOfWorld


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312011-12-312010-12-312009-12-31
Value5959595959596060585655
Percentage of Goodwill10.810.811.511.512.114.214.114.013.617.417.3
Percentage of Assets1.91.91.91.92.12.32.42.52.52.72.8
Percentage of Assets aos:RestOfWorld0.00.00.00.00.011.011.511.50.00.00.0

Indefinite Lived Intangible Assets Excluding Goodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:TradeNames


Indefinite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value184183164165163141143145
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.86.05.35.25.65.35.76.1
Percentage of Assets us-gaap:TradeNames0.00.00.00.00.00.00.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value318320323325329333338339343289293297300304308312302305308311285288291295299303308312317320324329332337338342345349352355104105106115
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.110.310.211.011.011.211.111.110.89.29.59.89.79.89.710.110.110.410.711.010.710.911.011.311.611.812.312.613.113.513.614.014.514.915.015.315.815.515.015.14.94.85.05.9

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value13915412914314514916417919220663
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.45.14.24.55.05.76.67.58.58.83.0

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerLists


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value13915412814214314816317718920360
Percentage of FiniteLivedIntangibleAssetsNet100.099.999.799.399.099.199.098.898.898.594.2
Percentage of Assets4.45.04.24.55.05.66.57.48.48.72.8
Percentage of Assets us-gaap:CustomerLists0.00.00.00.00.00.00.00.00.00.00.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value4244414245444648480.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets1.31.41.31.41.51.51.51.61.50.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value10697899087828084858286878379767672706754626236303130312729283648494236373338383937373639
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.43.12.83.12.92.82.62.82.72.62.82.92.72.62.42.52.42.42.31.92.32.31.41.21.21.21.21.11.21.21.52.02.21.91.61.71.51.71.61.71.71.71.72.0

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1661811611661881591431351371481201111161361109991116101979299901009186859080918175715158627590778555695352
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.35.85.15.66.35.44.74.44.34.73.93.73.84.43.53.23.14.03.53.53.53.73.43.93.53.43.43.73.33.93.43.23.12.32.62.83.44.03.33.62.63.12.52.7

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:ContractWithCustomerLiabilityCurrent


Contract
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
Value927790684365494329334756
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.02.52.82.31.42.21.61.40.91.11.51.8

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value907836886805735699766730730737785738768766788731705720765682615602653624579595605587550536590535490477499462459502519619535555536491
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets28.926.928.027.124.623.425.123.823.023.525.624.424.924.724.723.623.724.526.524.223.022.724.724.022.423.224.123.622.622.524.722.821.421.022.020.721.022.322.126.325.025.225.424.9

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6.86.86.86.86.86.86.80.02.77.47.57.57.47.27.27.37.413121313481313141414148.61818181818181818181821
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.20.20.00.10.20.20.20.20.20.20.30.30.50.50.50.51.90.50.60.60.60.60.60.40.80.80.80.80.80.80.80.90.80.91.1

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value12121111111112
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.40.40.4

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value113284221410323249223191243461261
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.69.37.212.811.29.48.98.010.819.712.4

us-gaap:LongTermDebt us-gaap:LongtermDebtType

aos:TermNotesWithInsuranceCompanies


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value113120120122125892231496886
Percentage of LongTermDebt100.042.354.229.938.835.710.116.320.414.833.3
Percentage of Assets3.63.93.93.84.33.40.91.32.22.94.1
Percentage of Assets aos:TermNotesWithInsuranceCompanies0.00.00.00.00.00.00.00.00.00.00.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9999106107274335277312351277221193245285402442367362316328274274236247266255210240236213177213200210225261266300443376356321242232
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.23.23.43.69.211.39.110.211.18.87.26.48.09.212.614.212.312.310.911.610.310.38.99.510.310.08.49.79.78.97.49.18.79.39.911.712.113.418.916.016.714.611.511.8

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value5.47.56.57.36.2
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.2
Percentage of Assets us-gaap:OtherPostretirementBenefitPlansDefinedBenefit0.00.00.00.00.0

us-gaap:PensionPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value13274947108
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent248.1368.0756.9649.31746.8
Percentage of Assets0.40.91.61.53.7
Percentage of Assets us-gaap:PensionPlansDefinedBenefit0.00.00.00.00.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1881901772662652731882922912952003123063042111981941888819217016757187185180601761781796215915614952157153156491491521476167
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.06.15.69.08.99.26.29.59.29.46.510.39.99.86.66.46.56.43.16.86.46.32.27.27.17.02.47.17.37.52.66.86.86.62.37.07.06.92.16.37.16.72.93.4

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value333534343737383939410.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets1.11.21.11.21.31.31.31.31.31.30.0

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
Value6.96.7109.6
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0
Percentage of Assets0.20.20.30.3

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
Value5800000.05600000.05600000.05400000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0
Percentage of Assets0.20.20.20.2

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
Value4100000.04000000.04600000.04400000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0
Percentage of Assets0.10.10.10.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value2900000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value21
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.7

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value46484546494850515153
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.51.41.51.61.61.71.71.61.7

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value56595657
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0
Percentage of Assets1.81.91.81.9

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value10111111
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0
Percentage of Assets0.30.40.40.4

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value18161849184817471658161616661656172517491717175617301708164816651613156615151525148014781442142214361405138113751328
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets57.859.558.558.855.654.254.554.054.355.655.958.156.155.051.653.754.153.352.454.055.455.854.554.755.554.854.955.355.6

us-gaap:StockholdersEquity us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

aos:CommonStockClassUndefined, us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-31
Value164164164164164164164164164164164
Percentage of StockholdersEquity9.18.98.99.49.910.29.99.99.59.610.0
Percentage of Assets5.25.35.25.55.55.55.45.45.25.45.1
Percentage of Assets aos:CommonStockClassUndefined us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonClassA, us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-31
Value130130130130130130130130130131131
Percentage of StockholdersEquity7.27.17.17.57.98.17.97.97.67.68.0
Percentage of Assets4.24.24.14.44.44.44.34.34.14.34.1
Percentage of Assets us-gaap:CommonClassA us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-266.1-269.9-273.7-272.1-275.0-278.7-282.3-280.2-279.2-282.3-285.2-259.6-265.2-268.7-272.1-280.6-283.2-281.6-284.2-272.9-275.3-272.7-275.2-267.3-270.0-273.7-276.2
Percentage of StockholdersEquity-14.7-14.6-14.8-15.6-16.6-17.2-16.9-16.9-16.2-16.1-16.6-14.8-15.3-15.7-16.5-16.8-17.5-18.0-18.8-17.9-18.6-18.4-19.1-18.8-18.8-19.5-20.0
Percentage of Assets-8.5-8.7-8.7-9.2-9.2-9.3-9.2-9.1-8.8-9.0-9.3-8.6-8.6-8.6-8.5-9.0-9.5-9.6-9.8-9.7-10.3-10.3-10.4-10.3-10.4-10.7-11.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value-0.5-1.40.60.4-0.30.50.2-0.4-0.1-0.8-0.71.2-0.11.1-0.9-0.80.81.30.2
Percentage of StockholdersEquity-0.0-0.10.00.0-0.00.00.0-0.0-0.0-0.0-0.00.1-0.00.1-0.1-0.00.00.10.0
Percentage of Assets-0.0-0.00.00.0-0.00.00.0-0.0-0.0-0.0-0.00.0-0.00.0-0.0-0.00.00.00.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-311.2-320.8-321.2-336.5-355.8-362.4-348.3-361.6-338.4-332.1-350.8-318.2-304.4-275.7-299.5-322.4-340.7-352.2-363.2-324.8-323.5-304.3-313.4-290.5-276.0-272.0-259.1
Percentage of StockholdersEquity-17.1-17.3-17.4-19.3-21.5-22.4-20.9-21.8-19.6-19.0-20.4-18.1-17.6-16.1-18.2-19.4-21.1-22.5-24.0-21.3-21.8-20.6-21.7-20.4-19.2-19.7-19.5
Percentage of Assets-9.9-10.3-10.2-11.3-11.9-12.1-11.4-11.8-10.7-10.6-11.4-10.5-9.9-8.9-9.4-10.4-11.4-12.0-12.6-11.5-12.1-11.5-11.8-11.2-10.7-10.8-10.8
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-44.6-49.5-48.1-64.8-80.5-84.2-66.2-81.0-59.1-49.0-64.9-59.8-39.1-8.1-26.5-41.0-58.3-71.9-79.2-51.4-47.9-30.8-39.4-24.7-6.9-6.03.3
Percentage of StockholdersEquity-2.5-2.7-2.6-3.7-4.9-5.2-4.0-4.9-3.4-2.8-3.8-3.4-2.3-0.5-1.6-2.5-3.6-4.6-5.2-3.4-3.2-2.1-2.7-1.7-0.5-0.40.2
Percentage of Assets-1.4-1.6-1.5-2.2-2.7-2.8-2.2-2.6-1.9-1.6-2.1-2.0-1.3-0.3-0.8-1.3-2.0-2.4-2.7-1.8-1.8-1.2-1.5-0.9-0.3-0.20.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value535528520518517516509507506503496495494491486477469451441
Percentage of StockholdersEquity29.528.628.229.731.231.930.530.629.428.828.928.228.628.829.531.532.532.733.2
Percentage of Assets17.017.016.517.517.317.316.616.516.016.016.216.416.015.815.216.517.718.018.4
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value264125652509243123652336232322712220215521022014194018561792159313501135982
Percentage of StockholdersEquity145.4138.7135.8139.2142.6144.5139.4137.2128.7123.2122.5114.7112.1108.7108.7105.193.682.273.9
Percentage of Assets84.182.679.481.879.378.376.074.069.968.668.566.662.959.856.155.151.045.141.1
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value-1344.4-1219.3-1155.9-1162.3-1163.7-1168.9-1112.7-1056.4-958.8-872.7-827.2-730.9-695.1-659.5-626.5-488.1-360.5-230.5-132.6
Percentage of StockholdersEquity-74.0-65.9-62.5-66.5-70.2-72.3-66.8-63.8-55.6-49.9-48.2-41.6-40.2-38.6-38.0-32.2-25.0-16.7-10.0
Percentage of Assets-42.8-39.2-36.6-39.1-39.0-39.2-36.4-34.4-30.2-27.8-26.9-24.2-22.5-21.2-19.6-16.9-13.6-9.2-5.5
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

aos:CommonStockClassUndefined


Common
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value164164164164164
Percentage of CommonStockValue100.0100.0100.0100.0100.0
Percentage of Assets5.25.35.25.55.4
Percentage of Assets aos:CommonStockClassUndefined0.00.00.00.00.0

us-gaap:CommonClassA


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value130130130130130130130130130131131131131131131131131131131131656565666666666666666666
Percentage of CommonStockValue79.379.379.579.50.00.079.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets4.24.24.14.44.44.44.34.34.14.24.34.34.24.24.14.24.44.54.64.72.52.52.52.52.62.62.62.72.72.82.82.9
Percentage of Assets us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value535528520518517516509507506503496495494491486485484482477476622619617613609607600599597593589588586583654653652651652651650648655636
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.017.016.517.517.317.316.616.516.016.016.216.416.015.815.215.616.216.416.516.923.323.423.323.623.523.723.924.124.624.924.725.025.525.728.929.229.828.927.827.630.429.431.032.3

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value264125652509243123652336232322712220215521022014194018561792179417241656159315311469140313501287123111761135109510581015982950915884855825797770729705530486452365
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets84.182.679.481.879.378.376.074.069.968.668.566.662.959.856.157.857.856.355.154.255.052.951.049.547.545.945.144.143.642.641.140.539.939.037.736.936.434.231.129.924.722.121.418.5

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-311.2-320.8-321.2-336.5-355.8-362.4-348.3-361.6-338.4-332.1-350.8-318.2-304.4-275.7-299.5-322.4-340.7-352.2-363.2-324.8-323.5-304.3-313.4-290.5-276.0-277.6-272.0-254.5-258.9-263.3-259.1-309.3-318.7-315.0-320.5-302.1-304.7-298.7-300.9-252.9-228.8-229.4-229.4-230.9
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-9.9-10.3-10.2-11.3-11.9-12.1-11.4-11.8-10.7-10.6-11.4-10.5-9.9-8.9-9.4-10.4-11.4-12.0-12.6-11.5-12.1-11.5-11.8-11.2-10.7-10.8-10.8-10.2-10.7-11.1-10.8-13.2-13.9-13.9-14.1-13.5-13.9-13.3-12.8-10.7-10.7-10.4-10.9-11.7

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value13441219115511621163116811121056958872827730695659626587550516488453435387360336276250230213188150132125756569596155725759607479
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets42.839.236.639.139.039.236.434.430.227.826.924.222.521.219.618.918.417.616.916.016.314.613.613.010.79.79.28.67.86.35.55.43.32.93.12.72.82.53.12.42.82.83.54.0

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdditionalPaidInCapital


Adjustments
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
Value1.17.21.11.11.48.81.31.11.98.61.11.31.46.3
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value91104231151125541761361222115911613043176771831081282611317361-3.41007478119183693570707.1-3.512817-35.0-52.2551865-14.4
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.713.627.819.918.98.523.518.716.02.919.715.415.65.522.910.326.215.919.34.217.727.79.4-0.516.012.713.12.116.415.512.67.013.415.21.5-0.726.94.3-8.6-12.515.14.817.4-3.9

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-62.512-0.6-11.8-2.226109-23.8-129.877-27.1-19.7-0.834-46.6-75.3-33.1-31.32926-32.3-36.7-66.748-147.4299-10.5-15.5-22.0-27.2-7.0-10.3
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-7.31.6-0.1-1.6-0.34.114.6-3.3-17.010.4-3.3-2.6-0.14.4-6.1-10.0-5.9-5.85.45.3-6.2-7.9-13.810.4-31.072.6-2.6-3.7-5.9-7.2-1.9-2.8

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-162.8-111.5-35.9-204.1-96.4-38.4-131.3-174.7-48.5-21.3-105.9-123.3-111.1-182.8-104.913-51.9-43.7-39.4-22.6-50.5-13.4-48.0-141.642152973-24.124-43.928
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-18.9-14.5-4.3-26.9-14.5-6.0-17.5-24.0-6.3-2.8-13.0-16.4-13.3-23.2-13.61.8-9.3-8.1-7.2-4.4-9.6-2.9-9.9-30.28.83.87.317.5-6.56.4-11.77.7

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value-133.700000000000025.4195-64.82642154
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-15.60.723.4-8.54.06.620.6

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1919192019202019182018171717181717161616151615151615151414141714131414131313131111101110.09.210
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value91104231151125541761361222115911613043176771831081282611317361-3.41007478119183693570707.1-3.512817-35.0-52.2551865-14.4
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.713.627.819.918.98.523.518.716.02.919.715.415.65.522.910.326.215.919.34.217.727.79.4-0.516.012.713.12.116.415.512.67.013.415.21.5-0.726.94.3-8.6-12.515.14.817.4-3.9

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1189712010567519187102891261041149822939287828387737973715853505746424632182504132321630
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.712.714.413.910.28.112.212.013.311.915.513.913.712.53.012.512.511.911.812.213.111.512.511.810.99.48.58.79.68.57.68.66.744.212.49.88.78.54.48.4

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value11897120105675191871028912610411498
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.712.714.413.910.28.112.212.013.311.915.513.913.712.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-62.512-0.6-11.8-2.226109-23.8-129.877-27.1-19.7-0.834-46.6-75.3-33.1-31.32926-32.3-36.7-66.748-147.4299-10.5-15.5-22.0-27.2-7.0-10.3
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-7.31.6-0.1-1.6-0.34.114.6-3.3-17.010.4-3.3-2.6-0.14.4-6.1-10.0-5.9-5.85.45.3-6.2-7.9-13.810.4-31.072.6-2.6-3.7-5.9-7.2-1.9-2.8

Payments To Acquire Productive Assets

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:PaymentsToAcquireProductiveAssets


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value13172011121214131520261922172730191622211819192216142015252532271918251417131612111216218.47.7
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-162.8-111.5-35.9-204.1-96.4-38.4-131.3-174.7-48.5-21.3-105.9-123.3-111.1-182.8-104.913-51.9-43.7-39.4-22.6-50.5-13.4-48.0-141.642152973-24.124-43.928
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-18.9-14.5-4.3-26.9-14.5-6.0-17.5-24.0-6.3-2.8-13.0-16.4-13.3-23.2-13.61.8-9.3-8.1-7.2-4.4-9.6-2.9-9.9-30.28.83.87.317.5-6.56.4-11.77.7

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2021-06-302021-03-312020-12-312020-09-30
Value0.06.80.7167
Percentage of RepaymentsOfLongTermDebt0.0100.0100.0100.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4142423838393936363737303031242424242121212116161617131313131111119.49.29.27.57.37.47.46.56.46.46.46.05.9
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-312011-09-30
Value131670.00.00.0565797874596363633353736303518513023572620172539217.252103.5120.0170.0
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value21.922.5-0.323.20.2210.236-0.0020.2260.2280.2-0.0070.2050.2160.2120.1520.2880.2780.272-0.0020.2970.2980.29-0.010.3130.3110.2950.0020.270.2710.28-0.010.2460.3130.317-0.0040.2880.3080.320.0070.3240.3020.282-0.0470.3050.275
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value46.6345.743.0140.9140.5438.7137.6437.3336.5436.3133.0532.9132.6732.3927.7326.2426.2225.1921.6921.6442.8641.4336.0534.5433.6333.627.527.4227.1926.522.3721.8421.3321.0133.4329.128.8228.2324.8425.0422.17
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1121192314613413613262
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value10196103103161164167156171154179
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value9000000.09000000.09000000.09700000.09700000.08300000.06200000.04200000.02600000.01200000.01300000.01300000.01800000.02900000.02700000.02700000.03800000.0
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1311131513119.89.67.48.41.9
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aos:AdjustmentsToAdditionalPaidInCapitalShareUnitsIssued us-gaap:StatementEquityComponents

aos:AdjustmentsToAdditionalPaidInCapitalShareUnitsIssued

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value100000.05300000.00200000.006500000.00
Percentage of AdjustmentsToAdditionalPaidInCapitalShareUnitsIssued100.0100.00.0100.00.0100.00.0

aos:PaymentsForProceedsFromStockOptionsActivity

aos:PaymentsForProceedsFromStockOptionsActivity


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-10.0-4.515-7.03.8-1.20.9-0.91.1-1.60.2
Percentage of PaymentsForProceedsFromStockOptionsActivity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aos:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue us-gaap:AwardType

aos:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue

us-gaap:RestrictedStock


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value06100000.0100000.0100000.007200000.00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue0.0100.0100.0100.00.0100.00.0

aos:StockIssuedDuringPeriodValueStockIncentiveAndDirectorsCompensation us-gaap:StatementEquityComponents

aos:StockIssuedDuringPeriodValueStockIncentiveAndDirectorsCompensation

us-gaap:AdditionalPaidInCapital


Stock
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
Value1000000.05300000.00100000.0-700000.0-6500000.000-900000.0-6100000.00-200000.0-1300000.0-5400000.0
Percentage of StockIssuedDuringPeriodValueStockIncentiveAndDirectorsCompensation100.0100.00.0100.0100.0100.00.00.0100.0100.00.0100.0100.0100.0

us-gaap:TreasuryStock


Stock
Period End2021-06-302020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-30
Value200000.00800000.0-400000.000-200000.000
Percentage of StockIssuedDuringPeriodValueStockIncentiveAndDirectorsCompensation20.00.0800.057.10.00.022.20.0-0.0

aos:VestingOfShareUnits us-gaap:StatementEquityComponents

aos:VestingOfShareUnits

us-gaap:AdditionalPaidInCapital


Vesting
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
Value100000.01700000.0200000.0001600000.0200000.00100000.01900000.0100000.0002300000.0
Percentage of VestingOfShareUnits100.0100.0100.00.00.0100.0100.00.0100.0100.0100.00.00.0100.0

us-gaap:TreasuryStock


Vesting
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-100000.0-1700000.0-200000.000-1600000.0-100000.00-100000.0-2000000.0-100000.00-200000.0-2300000.0
Percentage of VestingOfShareUnits-100.0-100.0-100.00.00.0-100.0-50.00.0-100.0-105.3-100.00.00.0-100.0

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStockDividendsPerShareDeclared


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.260.240.240.240.240.220.220.220.220.180.180.180.140.140.140.140.120.060.060.060.0950.0950.0950.0950.0750.0750.0750.0750.060.060.060.050.10.10.080.080.080.080.070.070.070.070.0650.065
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses


Defined
Period End2020-09-302019-09-30
Value-5.2-4.4
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-06-302020-03-31
Value-5.2-5.2-5.0-4.9
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses0.00.00.00.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit


Defined
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value-100000.0-100000.0-100000.0-200000.0-100000.0-100000.0-200000.0-100000.0-100000.0-100000.0-300000.0-100000.0-300000.0-200000.0-300000.0-300000.0-200000.0-300000.0-300000.0-200000.0-300000.0-300000.0-200000.0-200000.0-200000.0-200000.0-200000.0-200000.0-200000.0-200000.0-200000.0-500000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets


Defined
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value1313131414141414141414141313131414141515151515151717171717171515
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-06-302020-03-31
Value12121313
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets0.00.0100.0100.0

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:DefinedBenefitPlanInterestCost


Defined
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value5.75.85.78.07.87.97.27.37.27.67.57.57.77.77.69.49.49.41111119.99.99.81010101011111111
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-06-302020-03-31
Value3.63.65.85.7
Percentage of DefinedBenefitPlanInterestCost0.00.0100.0100.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost


Defined
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value-1.8-2.0-2.1-1.7-2.2-2.1-2.1-2.3-2.2-2.2-2.2-2.1-1.7-1.4-1.70.16.66.66.67.07.16.93.53.43.40.81.61.62.62.1
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-06-302020-03-31
Value-2.9-2.9-2.0-2.1
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost0.00.0100.0100.0

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DefinedBenefitPlanServiceCost


Defined
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value400000.0300000.0400000.0400000.0500000.0400000.0500000.0500000.0500000.0500000.0500000.0400000.0400000.0400000.0500000.0500000.0500000.0500000.02000000.01800000.02100000.02300000.02200000.02300000.01900000.01900000.02000000.02200000.02500000.02400000.02100000.02000000.0
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-06-302020-03-31
Value400000.0400000.0300000.0400000.0
Percentage of DefinedBenefitPlanServiceCost0.00.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:DividendsCommonStockCash

us-gaap:RetainedEarnings


Dividends
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
Value4142423838393936363737303031
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet

us-gaap:IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3613-69.6-24.9-51.015-76.4-32.1-10.486-30.98.3-7.870-26.74.630119-92.3-21.3-24.969
Percentage of IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet

us-gaap:IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet


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
Value107.0-21.61.01411124.3101016-0.1119.6-34.531-4.22.77.311-0.8-3.316-0.3-2.66.6-7.4-1.31.7-0.5-2.3-5.06.1-3.0
Percentage of IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-03-31
Value1490200.01258600.053556.01068600.0965650.01025800.0-5321.01244800.01260700.01292300.0-82355.01576700.01666600.01818700.0-9424.01909200.01897000.02039800.015153.02138600.02037000.01058400.0730430.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LeaseCost us-gaap:IncomeStatementLocation

us-gaap:LeaseCost

us-gaap:CostOfSales


Lease
Period End2021-06-302021-03-312020-06-302020-03-31
Value1000000.01000000.0800000.0700000.0
Percentage of LeaseCost100.0100.0100.0100.0

us-gaap:SellingGeneralAndAdministrativeExpenses


Lease
Period End2021-06-302021-03-312020-06-302020-03-31
Value4100000.04000000.04200000.04000000.0
Percentage of LeaseCost410.0400.0525.0571.4

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Oci
Period End2020-12-312020-09-302019-12-312019-09-302018-12-312018-09-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-30
Value-5.4-0.9-5.4-4.1-29.02.05.7-0.1-4.1-13.5-0.1-5.2-10.30.6
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-09-302018-06-302017-09-302017-06-30
Value0.3-2.20.21.0-0.40.90.5-0.80.11.3-0.9-1.60.2
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent0.00.0-3.7-111.10.00.0-9.319.50.065.00.01600.0-4.9

us-gaap:AccumulatedTranslationAdjustment


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value4.9-1.416153.7-18.014-21.9-10.115-5.1-20.7-31.0181417137.3-27.8-3.5-17.18.6-14.7-17.8-0.9
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent0.00.0-309.3-1744.40.00.0-274.1534.10.00.017.6-1035.00.00.0254.4-17300.0-331.70.0205.93500.0328.80.0142.70.0-150.0

us-gaap:OperatingLeaseCost us-gaap:IncomeStatementLocation

us-gaap:OperatingLeaseCost

us-gaap:CostOfSales


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.90.70.80.71.00.70.70.7
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SellingGeneralAndAdministrativeExpenses


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.74.14.24.04.34.34.14.9
Percentage of OperatingLeaseCost411.1585.7525.0571.4430.0614.3585.7700.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value300000.0-700000.0200000.0300000.0-400000.0100000.0200000.0100000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value400000.0-2900000.0300000.01300000.0-500000.01200000.0800000.0-1100000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax us-gaap:DerivativeInstrumentRisk

us-gaap:CommodityContract


Other
Period End2020-09-302020-06-302020-03-312019-12-31
Value-100000.0100000.0-200000.00
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax-7.7-20.0-16.70.0

us-gaap:ForeignExchangeContract


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value400000.0-2900000.0100000.01400000.0-600000.01400000.0800000.0-1100000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax100.0100.033.3107.7120.0116.7100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-800000.0-300000.00400000.0500000.0800000.0-200000.0-700000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:ForeignExchangeContract, us-gaap:CostOfSales


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-800000.0-300000.0200000.0400000.0500000.0800000.0-100000.0-100000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax100.0100.00.0100.0100.0100.050.014.3

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-3.8-3.81.6-2.9-3.7-3.62.11.0-3.1-2.925-5.6-3.5-3.4-8.5-2.61.6-2.611-2.42.6-2.57.9-2.7-3.7-2.5
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-1300000.0-1300000.0-3100000.0-900000.0-1200000.0-1200000.0600000.0300000.0800000.01000000.08200000.0-1700000.01000000.0-1100000.0-5200000.0-1700000.01100000.0-1700000.07200000.0-1600000.01700000.0-1500000.05200000.0-1800000.0-2300000.0-1800000.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherRestructuringCosts

us-gaap:OtherRestructuringCosts


Other
Period End2020-12-312020-06-30
Value0900000.0
Percentage of OtherRestructuringCosts0.0100.0

us-gaap:PaymentForContingentConsiderationLiabilityInvestingActivities us-gaap:StatementScenario, us-gaap:BusinessAcquisition, us-gaap:ContingentConsiderationByType

us-gaap:PaymentForContingentConsiderationLiabilityInvestingActivities

srt:ScenarioForecast, aos:WaterRightInc, aos:EscrowDeposit


Payment
Period End2021-06-302020-12-31
Value100000.01900000.0
Percentage of PaymentForContingentConsiderationLiabilityInvestingActivities100.0100.0

us-gaap:PaymentsForRestructuring

us-gaap:PaymentsForRestructuring


Payments
Period End2020-09-302020-06-302019-09-302019-06-302019-03-312014-09-302014-06-302014-03-312013-09-302013-06-30
Value2500000.02500000.0200000.0100000.0100000.0400000.0800000.01100000.04200000.0900000.0
Percentage of PaymentsForRestructuring100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForRestructuring us-gaap:RestructuringCostAndReserve

us-gaap:EmployeeSeverance


Payments
Period End2020-09-302020-06-302019-09-302019-06-302019-03-312014-09-302014-06-302014-03-31
Value2000000.02200000.0200000.000200000.0200000.0500000.0
Percentage of PaymentsForRestructuring80.088.0100.00.00.050.025.045.5

us-gaap:OtherRestructuring


Payments
Period End2020-09-302020-06-30
Value500000.0300000.0
Percentage of PaymentsForRestructuring20.012.0

us-gaap:PaymentsToAcquireMarketableSecurities

us-gaap:PaymentsToAcquireMarketableSecurities


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value732437285238353515348178961638417612214813614810516614310684115121172387633684.52731735711960
Percentage of PaymentsToAcquireMarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleAndMaturityOfMarketableSecurities

us-gaap:ProceedsFromSaleAndMaturityOfMarketableSecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-31
Value2554572862781592514614717796185136157120149134116741111321011025472
Percentage of ProceedsFromSaleAndMaturityOfMarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrualPayments

us-gaap:ProductWarrantyAccrualPayments


Product
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value12131112111211111312109.911119.28.49.810108.91515141414161514151715131515141114-15.3-15.5-15.1-13.7-14.0-13.8-12.6
Percentage of ProductWarrantyAccrualPayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrualWarrantiesIssued

us-gaap:ProductWarrantyAccrualWarrantiesIssued


Product
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value151212121311
Percentage of ProductWarrantyAccrualWarrantiesIssued100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-5.1-5.1-5.0-5.14.94.84.34.23.93.9-4.7-4.7-4.5-4.6-4.4-4.5-4.1-4.4-3.6-4.1-4.3-4.0-4.1-4.5-5.1
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCredit


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value0.10.10.10.1-0.1-0.1-0.1-0.2-0.1-0.10.10.20.10.10.10.10.30.10.70.30.20.30.60.30.2
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent-2.0-2.0-2.0-2.0-2.0-2.1-2.3-4.8-2.6-2.6-2.1-4.3-2.2-2.2-2.3-2.2-7.3-2.3-19.4-7.3-4.7-7.5-14.6-6.7-3.9

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-5.2-5.2-5.1-5.25.04.94.44.44.04.0-4.8-4.9-4.6-4.7-4.5-4.6-4.4-4.5-4.3-4.4-4.5-4.3-4.7-4.8-5.3
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent102.0102.0102.0102.0102.0102.1102.3104.8102.6102.6102.1104.3102.2102.2102.3102.2107.3102.3119.4107.3104.7107.5114.6106.7103.9

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-3.8-3.8-3.8-3.83.73.63.33.13.12.9-3.4-3.6-3.5-3.4-2.8-2.7-2.5-2.6-2.2-2.5-2.6-2.5-2.4-2.7-3.1
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-0.6-0.20.00.30.40.62.3-0.5
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent15.85.3-0.0-7.910.816.769.7-16.1

us-gaap:ReclassificationFromAociCurrentPeriodTax us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-1300000.0-1300000.0-1200000.0-1300000.01200000.01200000.01000000.01100000.0800000.01000000.0-1300000.0-1100000.0-1000000.0-1200000.0-1600000.0-1800000.0-1600000.0-1800000.0-1400000.0-1600000.0-1700000.0-1500000.0-1700000.0-1800000.0-2000000.0
Percentage of ReclassificationFromAociCurrentPeriodTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-200000.0-100000.00100000.0100000.0200000.0900000.0-200000.0
Percentage of ReclassificationFromAociCurrentPeriodTax15.47.7-0.0-7.78.316.790.0-18.2

us-gaap:RestrictedStockExpense us-gaap:AwardType

us-gaap:RestrictedStockExpense

us-gaap:RestrictedStock


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value1000000.03800000.0700000.0600000.0700000.04500000.0500000.0800000.01200000.04400000.0600000.01000000.0800000.03300000.0700000.0700000.0800000.03000000.0700000.0700000.0600000.02600000.0600000.0500000.0900000.01300000.01200000.01300000.02200000.0800000.0800000.0700000.01300000.0
Percentage of RestrictedStockExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringCharges

us-gaap:RestructuringCharges


Restructuring
Period End2020-09-302020-06-302019-06-30
Value1600000.06100000.00
Percentage of RestructuringCharges100.0100.00.0

us-gaap:RestructuringCharges us-gaap:RestructuringCostAndReserve

us-gaap:EmployeeSeverance


Restructuring
Period End2020-09-302020-06-30
Value1600000.05200000.0
Percentage of RestructuringCharges100.085.2

us-gaap:RestructuringCharges us-gaap:StatementBusinessSegments

aos:NorthAmericaSegment


Restructuring
Period End2020-09-302020-06-302019-06-30
Value500000.02200000.00
Percentage of RestructuringCharges31.236.10.0

aos:RestOfWorld


Restructuring
Period End2020-09-302020-06-302019-06-30
Value1100000.03900000.00
Percentage of RestructuringCharges68.863.90.0

us-gaap:SeveranceCosts1

us-gaap:SeveranceCosts1


Severance
Period End2020-12-312020-09-302020-06-302018-03-212013-06-30
Value01600000.05200000.04000000.02600000.0
Percentage of SeveranceCosts10.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

us-gaap:RestrictedStock


Share
Period End2021-06-302021-03-312020-12-31
Value-0.753.22-0.1
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStock


Share
Period End2021-06-302021-03-312020-12-31
Value-0.0860.820.14
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStock


Share
Period End2021-06-302021-03-312020-12-31
Value0.1960.540
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue100.0100.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate

us-gaap:EmployeeStockOption


Share
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value01.6002.1
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate0.0100.00.00.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:EmployeeStockOption


Share
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value0.127.30.1023.6
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate100.0100.0100.00.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:EmployeeStockOption


Share
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value01.2-0.101.6
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate0.0100.0100.00.0100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-31
Value0.9535.072.44
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-31
Value3.0845.360
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice100.0100.00.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-31
Value0.0360.820
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice100.0100.00.0

us-gaap:ShortTermLeaseCost

us-gaap:ShortTermLeaseCost


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value500000.0500000.0300000.0500000.0600000.0400000.0600000.0400000.0500000.0400000.0
Percentage of ShortTermLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecurities

aos:CommonStockClassUndefined, us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-30
Value0.00.10.00.1
Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecurities0.0100.00.0100.0

us-gaap:CommonClassA, us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value0.0-0.20.0-0.10.0
Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecurities0.0-200.00.0-100.00.0

us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecurities us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.20.00.10.00.00.00.10.00.00.00.00.2
Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecurities0.0200.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:AdditionalPaidInCapital


Stock
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
Value4.42.60.80.5-1.1-0.10.6-0.50.50.1-0.10.30.30.9
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStock


Stock
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
Value5.71.96.21.44.8-1.11.3-0.20.6-1.90.20.50.8-2.2
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised129.573.1775.0280.0-436.41100.0216.740.0120.0-1900.0-200.0166.7266.7-244.4

us-gaap:StockOptionPlanExpense

us-gaap:StockOptionPlanExpense


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value500000.03600000.0500000.0500000.0700000.04500000.0500000.0700000.0900000.04300000.0-200000.0800000.0600000.03200000.0700000.0600000.0500000.02900000.0600000.0500000.0900000.02500000.0500000.0500000.0500000.02500000.0400000.0800000.0900000.02800000.0400000.01100000.01100000.01800000.0700000.0700000.0700000.01100000.0500000.0500000.0600000.01200000.0500000.0500000.0600000.0
Percentage of StockOptionPlanExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:StatementEquityComponents

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:TreasuryStock


Treasury
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
Value131670.00.00.0565797874596363633
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:VariableLeaseCost

us-gaap:VariableLeaseCost


Variable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-06-30
Value600000.0600000.0400000.0300000.0500000.0400000.0700000.0400000.0200000.0800000.0200000.0
Percentage of VariableLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aos:DeferredTaxAssetEnvironmental

aos:DeferredTaxAssetEnvironmental


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1900000.01900000.02100000.02400000.02900000.02700000.03100000.03200000.03200000.03300000.03500000.0
Percentage of DeferredTaxAssetEnvironmental100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aos:DeferredTaxAssetTaxLossAndCreditCarryovers

aos:DeferredTaxAssetTaxLossAndCreditCarryovers


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2015171918141417151716
Percentage of DeferredTaxAssetTaxLossAndCreditCarryovers100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aos:DeferredTaxAssetsAccountsReceivable

aos:DeferredTaxAssetsAccountsReceivable


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1616181614131111119.67.4
Percentage of DeferredTaxAssetsAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aos:DefinedBenefitPlanFairValueOfNonInvestmentPlanAssets

aos:DefinedBenefitPlanFairValueOfNonInvestmentPlanAssets


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1500000.03400000.02200000.01000000.01400000.01800000.02900000.08300000.0800000.02000000.0500000.0
Percentage of DefinedBenefitPlanFairValueOfNonInvestmentPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aos:DefinedBenefitPlanFairValueOfPlanAssetsIncludingNoninvestmentPlanAssets

aos:DefinedBenefitPlanFairValueOfPlanAssetsIncludingNoninvestmentPlanAssets


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value858832777874787759823
Percentage of DefinedBenefitPlanFairValueOfPlanAssetsIncludingNoninvestmentPlanAssets100.0100.0100.0100.0100.0100.0100.0

aos:DistributorRebateAccruals

aos:DistributorRebateAccruals


Distributor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value6.54.95.46.47.29.114172125
Percentage of DistributorRebateAccruals100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aos:LesseeOperatingLeaseLiabilityToBePaidDueAfterYearFour

aos:LesseeOperatingLeaseLiabilityToBePaidDueAfterYearFour


Lessee
Period End2021-06-302021-03-312020-09-30
Value212123
Percentage of LesseeOperatingLeaseLiabilityToBePaidDueAfterYearFour100.0100.0100.0

aos:LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption

aos:LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption


Line
Period End2021-06-30
Value850
Percentage of LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption100.0

aos:LongTermDebtFixedInterestPayment

aos:LongTermDebtFixedInterestPayment


Long
Period End2020-12-31
Value22
Percentage of LongTermDebtFixedInterestPayment100.0

aos:NetOperatingLossesAndTaxCredits

aos:NetOperatingLossesAndTaxCredits


Net
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value201517191814141715171614
Percentage of NetOperatingLossesAndTaxCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aos:RentIncentivesAndDeferrals

aos:RentIncentivesAndDeferrals


Rent
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value4100000.03900000.03900000.03800000.0-3800000.0-3900000.03800000.0
Percentage of RentIncentivesAndDeferrals100.0100.0100.0100.0100.0100.0100.0

aos:TaxesPayableOnForeignEarningsNotPermanentlyReinvested

aos:TaxesPayableOnForeignEarningsNotPermanentlyReinvested


Taxes
Period End2020-12-312011-12-31
Value9.856
Percentage of TaxesPayableOnForeignEarningsNotPermanentlyReinvested100.0100.0

dei:EntityCommonStockSharesOutstanding us-gaap:StatementClassOfStock

dei:EntityCommonStockSharesOutstanding

aos:CommonStockClassUndefined


Entity
Period End2020-07-312020-04-302020-01-312019-10-312019-07-312019-04-302019-01-312018-10-312018-07-312018-04-302018-02-122017-10-312017-08-022017-05-022017-02-132016-10-312016-08-022016-05-032016-02-102015-10-30
Value13513513513713814114114314414514514514614614714774747474
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonClassA


Entity
Period End2020-07-312020-04-302020-01-312019-10-312019-07-312019-04-302019-01-312018-10-312018-07-312018-04-302018-02-122017-10-312017-08-022017-05-022017-02-132016-10-312016-08-022016-05-032016-02-102015-10-302015-02-102014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-30
Value2626262626262626262626262626262613131313131313136.6193956.6218936.6260686.6295076.62981
Percentage of EntityCommonStockSharesOutstanding19.219.319.219.018.818.518.418.118.018.017.917.917.817.817.817.717.717.617.617.50.00.00.00.00.00.00.00.00.0

us-gaap:AccountsPayableTradeCurrent

us-gaap:AccountsPayableTradeCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value612547595516435442509483488492543508532522535500493493528455402389424395369368393374356341387344315306328289278302302276258279263236
Percentage of AccountsPayableTradeCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
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
Value8800000.05300000.05600000.07200000.06700000.07500000.06700000.06200000.06400000.06700000.06400000.05900000.06700000.05800000.05300000.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-31
Value137871161311261351772942962953853844054344754444344294244093793343233263052942241251031051071971440.6
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value11211712312615714321216.3
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsInventory

us-gaap:DeferredTaxAssetsInventory


Deferred
Period End2020-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value1500000.000000
Percentage of DeferredTaxAssetsInventory100.00.00.00.00.00.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value9900000.07700000.04000000.05500000.04300000.03400000.04700000.02400000.01500000.0400000.0
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2127323067757766907195
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value4239424367666564576058
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value6661575477545240322928
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value3634363134363933353529
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings

us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value9.8202838424750566556
Percentage of DeferredTaxLiabilitiesUndistributedForeignEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1310132027363743492434414866102102109951311281341181221281331071091081101881911861901531451421395150179222232
Percentage of DefinedBenefitPensionPlanLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value869868833921894
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-2.7-2.0-3.6-3.4-4.9
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value453463468451472
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax-16777.8-23180.0-13025.0-13273.5-9644.9

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-600000.0200000.01400000.0800000.02000000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-452000000.0-463100000.0-468900000.0-451800000.0-473500000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax75333.3-231550.0-33492.9-56475.0-23675.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-3.3-1.8-2.2-2.6-2.9
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312017-12-312016-12-31
Value1.00.5-0.5-0.9
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax-30.3-27.819.231.0

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-31
Value3000000.0
Percentage of DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.040.0340.04460.03790.0433
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.440.03180.04320.03650.0415
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate119.693.596.996.395.8

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanBenefitObligation

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value5.98.07.07.66.66.6
Percentage of DefinedBenefitPlanBenefitObligation100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value869869833922895892
Percentage of DefinedBenefitPlanBenefitObligation14742.410866.211911.412140.813572.713528.8

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-31
Value2.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-31
Value264
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter13200.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.50.50.50.3
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value56666660
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths11340.013360.013280.020166.7

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.50.50.50.4
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value54555758
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive10800.011080.011560.014650.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.50.50.50.4
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value54565859
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour10960.011240.011660.014825.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.50.50.50.4
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value55575968
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree11160.011420.011800.017125.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.50.50.50.4
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value56576866
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo11320.011540.013660.016650.0

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value857828775873785757821814799767640
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-5900000.0-8000000.0-7000000.0-7600000.0-6600000.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-11000000.0-36900000.0-56300000.0-47900000.0-108800000.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan186.4461.2804.3630.31648.5

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value7.40.0770.060.0650.065
Percentage of DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage us-gaap:Range, us-gaap:DefinedBenefitPlanByPlanAssetCategories

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage

srt:Minimum, us-gaap:DefinedBenefitPlanEquitySecurities


Defined
Period End2020-12-31
Value30.0
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage100.0

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value5.00.050.050.050.05
Percentage of DefinedBenefitPlanUltimateHealthCareCostTrendRate1100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations us-gaap:DefinedBenefitPlanByPlanAssetCategories

us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations

us-gaap:DefinedBenefitPlanDebtSecurity


Defined
Period End2020-12-312019-12-31
Value46.047.0
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations100.0100.0

us-gaap:DefinedBenefitPlanEquitySecurities


Defined
Period End2020-12-312019-12-31
Value44.042.0
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations95.789.4

us-gaap:DefinedBenefitPlanRealEstate


Defined
Period End2020-12-312019-12-31
Value9.010.0
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations19.621.3

us-gaap:PrivateEquityFunds


Defined
Period End2020-12-312019-12-312013-12-312012-12-312011-12-31
Value1.01.00.050.040.05
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations2.22.10.00.00.0

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet us-gaap:HedgingDesignation

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet

us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value-0.6-3.0-4.3-0.46.97.5117.1-2.6-1.4-1.31.22.10.4-0.9-0.4-1.22.02.51.43.41.41.70.73.11.70.10.92.31.20.10.30.6-0.40.90.21.4
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeAsset us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeAsset

us-gaap:OtherCurrentAssets, us-gaap:ForeignExchangeContract, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value1.40.72.70.81.64.88.4106.94.83.95.54.71.30.20.61.21.01.90.60.71.03.64.6
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeLiability

us-gaap:AccruedLiabilities, us-gaap:ForeignExchangeContract, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302014-12-31
Value2000000.03700000.07000000.01200000.01900000.03600000.01500000.01900000.0900000.01300000.0600000.0400000.01000000.04200000.01800000.02000000.0300000.02000000.01200000.02500000.01300000.03000000.03000000.0
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeNotionalAmount us-gaap:Currency, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:Position

us-gaap:DerivativeNotionalAmount

currency:CAD, us-gaap:ForeignExchangeForward, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Short


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value6959794449
Percentage of DerivativeNotionalAmount100.0100.0100.0100.0100.0

currency:EUR, us-gaap:ForeignExchangeForward, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value2324322836
Percentage of DerivativeNotionalAmount34.141.141.064.672.4

currency:GBP, us-gaap:ForeignExchangeForward, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Short


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value0.50.71.00.31.3
Percentage of DerivativeNotionalAmount0.71.21.30.72.6

currency:MXN, us-gaap:ForeignExchangeForward, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value1918162018
Percentage of DerivativeNotionalAmount27.430.320.745.637.4

us-gaap:DerivativeNotionalAmount us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:Position

us-gaap:ForeignExchangeForward, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value4242494854
Percentage of DerivativeNotionalAmount61.571.461.7110.2109.9

us-gaap:ForeignExchangeForward, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Short


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value7060804451
Percentage of DerivativeNotionalAmount100.7101.2101.3100.7102.6

us-gaap:DerivativeNotionalAmount us-gaap:StatementGeographical, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:NonUs, us-gaap:ForeignExchangeForward, us-gaap:NetInvestmentHedging


Derivative
Period End2021-03-312020-12-312020-09-30
Value5010050
Percentage of DerivativeNotionalAmount83.6125.5113.4

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value7155747059476461554779747156908070588476685581716250706152436155504046443932413832283739
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1411271119682887459453121
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerLists


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1381231089380836955412718
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization97.497.297.097.297.394.093.392.290.488.486.9

us-gaap:Patents


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value3.73.53.32.72.25.35.04.74.43.62.8
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization2.62.83.02.82.76.06.77.89.611.613.1

us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:FiniteLivedIntangibleAssetsGross


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value28128124023922723823923923723785
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerLists


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value27827823623522423123223223123178
Percentage of FiniteLivedIntangibleAssetsGross98.798.798.598.598.497.297.297.297.197.192.4

us-gaap:Patents


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value3.73.73.73.73.76.66.76.86.86.86.6
Percentage of FiniteLivedIntangibleAssetsGross1.31.31.51.51.62.82.82.82.92.97.8

us-gaap:IntangibleAssetsGrossExcludingGoodwill

us-gaap:IntangibleAssetsGrossExcludingGoodwill


Intangible
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value465465404404390379382384384
Percentage of IntangibleAssetsGrossExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryGross

us-gaap:InventoryGross


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value354337324326329336326340353350335330311309313310305275269268247245238258254242232239228218214212201192186203202197195199184169
Percentage of InventoryGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryRawMaterials

us-gaap:InventoryRawMaterials


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value18516615916117217116817517717717416515915416015415014214213813414013913813112212112211110911310397101100106989798988882
Percentage of InventoryRawMaterials100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryWorkInProcess

us-gaap:InventoryWorkInProcess


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value262121222221212421232321222018171715131212131313111110111312121213131211111110101014
Percentage of InventoryWorkInProcess100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value11111211
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2021-06-302021-03-312020-09-30
Value7.2103.3
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0100.0100.0

us-gaap:LiabilitiesFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:LiabilitiesFairValueDisclosure

us-gaap:FairValueInputsLevel2


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value600000.03000000.04300000.0-400000.0-400000.01000000.06900000.08400000.06000000.03100000.07500000.0-1400000.0100000.0200000.0300000.0300000.0200000.0300000.0200000.0
Percentage of LiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd

aos:TermNotesWithInsuranceCompanies


Line
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value3.30.0330.0330.0340.0350.0390.0610.060.060.059
Percentage of LineOfCreditFacilityInterestRateAtPeriodEnd100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity


Line
Period End2021-06-30
Value500
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths


Long
Period End2020-12-31
Value6800000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive


Long
Period End2020-12-31
Value10000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour


Long
Period End2020-12-31
Value10000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree


Long
Period End2020-12-31
Value10000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo


Long
Period End2020-12-31
Value6800000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0

us-gaap:NotesPayable

us-gaap:NotesPayable


Notes
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value1131201201271341024359
Percentage of NotesPayable100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NotesPayableFairValueDisclosure

us-gaap:NotesPayableFairValueDisclosure


Notes
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value1231221201271331044463
Percentage of NotesPayableFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2021-06-302021-03-312020-12-312020-09-30
Value3.353.343.493.56
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0

us-gaap:OtherCommitment us-gaap:OtherCommitments

us-gaap:OtherCommitment

aos:RepurchaseOfInventory


Other
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value106.56.59.123
Percentage of OtherCommitment100.0100.0100.0100.0100.0

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value500000.0500000.0500000.0300000.0400000.0
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value600000.09300000.07100000.0500000.0500000.0
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities120.01860.01420.0166.7125.0

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value5.98.07.07.66.6
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value11365647108
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent186.4461.2804.3630.31648.5

us-gaap:PercentageOfLIFOInventory

us-gaap:PercentageOfLIFOInventory


Percentage
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value67.00.610.640.590.610.660.630.620.640.650.6
Percentage of PercentageOfLIFOInventory100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrual

us-gaap:ProductWarrantyAccrual


Product
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value144141142135136135134133134136139141142142142140140142140143141140139138138137136136136135136131129128129132132132131132130116112112110108
Percentage of ProductWarrantyAccrual100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrualClassifiedCurrent

us-gaap:ProductWarrantyAccrualClassifiedCurrent


Product
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value4945474544424142424241444544444443444444444543424242424646464646444343434344434242373634
Percentage of ProductWarrantyAccrualClassifiedCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrualNoncurrent

us-gaap:ProductWarrantyAccrualNoncurrent


Product
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value9596949297979695938986887574
Percentage of ProductWarrantyAccrualNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PurchaseObligation

us-gaap:PurchaseObligation


Purchase
Period End2020-12-31
Value157
Percentage of PurchaseObligation100.0

us-gaap:RestructuringReserve

us-gaap:RestructuringReserve


Restructuring
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312010-12-31
Value1700000.02700000.03600000.0500000.01100000.01300000.01400000.01500000.02000000.05500000.06700000.00500000.01300000.01700000.02500000.03600000.05600000.08500000.05200000.01700000.0
Percentage of RestructuringReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringReserve us-gaap:RestructuringCostAndReserve

us-gaap:EmployeeSeverance


Restructuring
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312014-12-312014-09-302014-06-302014-03-312013-12-312010-12-31
Value1700000.02600000.03000000.000200000.0200000.0200000.0300000.03100000.04000000.00400000.01000000.01200000.01000000.01500000.01100000.0
Percentage of RestructuringReserve100.096.383.30.00.015.414.313.315.056.459.70.080.076.970.640.041.764.7

us-gaap:OtherRestructuring


Restructuring
Period End2020-09-302020-06-302019-12-312018-12-31
Value100000.0600000.0500000.01300000.0
Percentage of RestructuringReserve3.716.7100.086.7

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:RestrictedStock


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value47.1747.3446.9946.9546.9346.9449.9250.0550.3749.9742.9342.9442.7742.5334.9634.2334.9834.9727.3527.3954.5953.4344.344.1544.1644.133.0633.2133.2333.2326.1426.0225.9925.9819.37
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312017-12-312016-12-312011-06-302010-12-31
Value44.3743.2140.3537.2830.0724.5220.4816.1222.3222.17
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue


Share
Period End2021-06-302021-03-312020-12-312020-09-30
Value68643539
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1


Sharebased
Period End2021-06-302021-03-312020-12-312020-09-30
Value44452330
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue


Sharebased
Period End2020-12-312019-12-312018-12-312017-12-31
Value46.2352.8251.5539.21
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate


Unrecognized
Period End2021-06-302021-03-312020-12-312020-09-302011-09-302011-06-302010-12-31
Value500000.0500000.0500000.0800000.02300000.02200000.02200000.0
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate100.0100.0100.0100.0100.0100.0100.0

us-gaap:ValuationAllowancesAndReservesBalance us-gaap:ValuationAllowancesAndReservesType

us-gaap:ValuationAllowancesAndReservesBalance

aos:ValuationAllowanceForTradeAndNotesReceivable


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value5.66.66.45.36.36.03.72.84.23.43.53.42.8
Percentage of ValuationAllowancesAndReservesBalance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ValuationAllowanceOfDeferredTaxAssets


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value1311131513119.89.67.48.41.91.50.5
Percentage of ValuationAllowancesAndReservesBalance232.1180.3204.7283.0207.9183.3264.9342.9176.2247.154.344.117.9

Line plots across dimensions of each concept


us-gaap:CommonStockValue
us-gaap:StatementClassOfStock
(None,)
Common Stock Valueus-gaap: Statement Class Of Stock
Operating Margin
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Operating  Marginus-gaap: Consolidation Items, us-gaap: Statement Business Segments
TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Operating Income Lossus-gaap: Consolidation Items, us-gaap: Statement Business Segments
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None, 'aos:NorthAmericaSegment')
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Consolidation Items, us-gaap: Product Or Service, us-gaap: Statement Business Segments
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems, us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None, 'aos:RestOfWorld')
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Consolidation Items, us-gaap: Statement Geographical, us-gaap: Statement Business Segments
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Consolidation Items, us-gaap: Statement Business Segments
us-gaap:Assets
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Assetsus-gaap: Consolidation Items, us-gaap: Statement Business Segments
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
(None, 'us-gaap:CommonStock')
Stockholders Equityus-gaap: Statement Class Of Stock, us-gaap: Statement Equity Components
us-gaap:NoncurrentAssets
us-gaap:StatementGeographical
(None,)
Noncurrent Assetsus-gaap: Statement Geographical
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
Property Plant And Equipment Grossus-gaap: Property Plant And Equipment By Type
us-gaap:Goodwill
us-gaap:StatementBusinessSegments
(None,)
Goodwillus-gaap: Statement Business Segments
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
us-gaap:RetirementPlanType
(None,)
Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrentus-gaap: Retirement Plan Type
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
(None, 'us-gaap:CommonStock')
Stockholders Equityus-gaap: Statement Class Of Stock, us-gaap: Statement Equity Components
us-gaap:CommonStockValue
us-gaap:StatementClassOfStock
(None,)
Common Stock Valueus-gaap: Statement Class Of Stock