STLD


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

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementEquityComponents
us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:CostOfGoodsAndServicesSold

us-gaap:GrossProfit
us-gaap:ConsolidatedEntities

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestExpense

us-gaap:InterestPaidNet

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:Revenues
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ConsolidatedEntities, us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments
us-gaap:ConsolidatedEntities, us-gaap:Subsegments
us-gaap:StatementGeographical

us-gaap:Assets
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent

us-gaap:ReceivablesNetCurrent

us-gaap:InventoryNet
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:Goodwill
us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:AccountsPayableCurrent

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:LongTermDebt
us-gaap:DebtInstrument

us-gaap:LongTermDebtNoncurrent

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:MinorityInterest

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:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue

us-gaap:MinorityInterest

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DepreciationDepletionAndAmortization
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInInventories

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

stld:DeferredIncomeTaxNoncashExpenseBenefit
us-gaap:StatementScenario
stld:ExpensesRecordedRelatedToCallAndEarlyPayoff
us-gaap:StatementBusinessSegments
stld:SegmentRevenuesFromExternalCustomersNetPercentage

stld:TransfersOfNonControllingInterestToRedeemableNonControllingInterestAndDecreaseFromDistributionsToNoncontrollingInterestHolders
us-gaap:StatementEquityComponents
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1
us-gaap:DerivativeInstrumentRisk, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:CommonStockDividendsPerShareDeclared
us-gaap:DebtInstrument
us-gaap:DebtInstrumentRedemptionPricePercentage

us-gaap:DerivativeExcludedComponentGainLossRecognizedInEarnings
us-gaap:ProductOrService, us-gaap:FinancialInstrument, us-gaap:Position
us-gaap:DerivativeNonmonetaryNotionalAmountMass

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet
us-gaap:DerivativeInstrumentRisk, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:GainLossOnPriceRiskDerivativesNet
us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:GoodwillPeriodIncreaseDecrease

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
us-gaap:StatementEquityComponents
us-gaap:NoncontrollingInterestIncreaseFromBusinessCombination

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax

us-gaap:OtherLaborRelatedExpenses
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OtherOperatingActivitiesCashFlowStatement
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:OtherOperatingIncomeExpenseNet

us-gaap:OtherSellingGeneralAndAdministrativeExpense
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsToAcquireBusinessesGross
us-gaap:BusinessAcquisition

us-gaap:PaymentsToAcquireShortTermInvestments

us-gaap:ProceedsFromIssuanceOfDebt

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:RepaymentsOfDebt

us-gaap:RevenueFromRelatedParties

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation
us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities
us-gaap:SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities
stld:AccountsReceivableNetCurrentIncludingRelatedPartyReceivables
us-gaap:BusinessAcquisition
stld:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsNetOfCashAcquired
us-gaap:CreditFacility
stld:CreditFacilityAmountByWhichFacilityCanBeIncreased
us-gaap:ConsolidatedEntities
stld:IntraCompanyDebt
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:CreditFacility
stld:OutstandingLettersOfCreditAndOtherObligations

us-gaap:AccountsPayableRelatedPartiesCurrent

us-gaap:AccountsReceivableNet
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
us-gaap:BalanceSheetLocation
us-gaap:AssetsHeldForSaleNotPartOfDisposalGroup
us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisitionPercentageOfVotingInterestsAcquired
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment

us-gaap:DebtInstrumentCarryingAmount
us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType
us-gaap:DebtInstrument
us-gaap:LongtermDebtType
us-gaap:DebtInstrument
us-gaap:DebtInstrumentFaceAmount

us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsInventory

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:FinancialInstrument
us-gaap:DerivativeAssets

us-gaap:DerivativeFairValueOfDerivativeAsset
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:DueFromRelatedPartiesCurrent
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:DueToRelatedPartiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:GoodwillImpairedAccumulatedImpairmentLoss

us-gaap:IntangibleAssetsGrossExcludingGoodwill

us-gaap:InterestPayableCurrent

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryRawMaterialsNetOfReserves

us-gaap:InventorySuppliesNetOfReserves

us-gaap:InventoryWorkInProcessNetOfReserves

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType
us-gaap:LineOfCredit
us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd
us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:CreditFacility
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:LongTermDebtFairValue

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType
us-gaap:LongtermDebtWeightedAverageInterestRate

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards

us-gaap:PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount
us-gaap:ConsolidatedEntities

us-gaap:RestrictedCashAndCashEquivalents
us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType
us-gaap:SecuritiesLoanedFairValueOfCollateral
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
us-gaap:AwardType
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockShares

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased

us-gaap:UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears

Plots across concepts


IncomeStatement
Profit Loss
Expenses
Other Nonoperating Income 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
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Operating Lease Liability
Current Liabilities
Operating Lease Liability Current
Noncurrent Liabilities
Minority Interest
Stockholders Equity
Common Stock Value
Per Share
Common Stock Dividends Per Share Declared
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Share Based Compensation
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
DividendsAndRepurchase
Dividends Common Stock Cash
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Net
InventoryNet
Inventory Work In Process Net Of Reserves
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 ███▇▇▇▇▆▆▆▆▆▆▆▆▄▄▄▄▄▄▄▃▂▂▂▂█▇▇▆▄▄▄▃▂▂▂▂▂▂▂▁0.6480.6480.6480.6460.6460.6460.6460.6450.6450.6450.6450.6440.6440.6440.6440.6410.6410.6410.6410.640.6390.6390.6380.6360.6360.6350.6350.6490.6470.6460.6450.6410.640.6390.6370.6360.6360.6360.6360.6360.6360.6350.633NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStockNANA210.914NANANA214.503NANANA225.272NANANA237.397NANANA243.785NANANA243.09NANANA241.449NANANA222.867NANANA219.523NANANA218.874NANANA217.575NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█211.246212.254NA211.926211.378214.024NA219.109222.519224.962NA235.649236.945237.723NA240.88243.021244.546NA245.682245.392244.608NA243.822243.491242.867NA242.244242.048241.394NA239.001221.736238.087NA220.044236.208236.526NA235.759236.266236.224NA234.543234.6234.659
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█209.647211.015NA210.366210.343213.254NA217.873221.505224.058NA234.208235.617236.623NA239.066241.343242.943NA243.761243.655243.202NA242.074241.9241.535NA240.087226.22223.011NA220.926220.471219.995NA219.191219.104218.996NA218.674218.5217.992NA216.881216.635216.284
us-gaap:EarningsPerShareBasic █▆▄▃▃▄▄▄▄▄▅▅▅▄▅▄▄▄▃▄▄▃▁▃▃▃▂▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃3.352.040.890.480.360.880.560.690.880.911.181.71.540.961.280.640.640.830.080.650.580.26-1.040.250.130.13-0.190.380.320.170.250.260.130.220.280.060.20.210.140.20.450.490.040.090.230.3
us-gaap:EarningsPerShareDiluted █▆▄▃▃▄▄▄▄▄▅▅▅▄▅▄▄▄▃▄▄▃▁▃▃▃▂▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃3.322.030.890.470.360.880.560.690.870.911.171.691.530.961.280.640.630.820.080.640.580.26-1.040.250.130.13-0.190.380.310.170.240.250.130.210.270.060.20.20.140.190.430.460.040.090.220.29
  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
 EBT Margin us-gaap:ConsolidatedEntities,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,stld:MetalsRecyclingOperations█▇▄▃▁▃▂▃▃▄▄▅▅▄1151.1061079.912721.24636.473416.688628.739525.295574.908656.766737.045765.339800.014884.095752.766NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidatedEntities,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,stld:SteelFabricationOperations█▄▂▃▂▂▃▃▃▂▄▄▂▁331.715259.02219.905246.59218.428221.441246.45246.716241.424228.669251.607250.745217.896201.703NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidatedEntities,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,stld:SteelOperations█▅▂▁▁▂▂▂▃▃▃▅▄▂3394.4422642.8471964.3031775.7841699.3982016.1521837.6242008.2052188.1852200.1652259.0642586.6262435.6881981.774NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Gross Margin us-gaap:ConsolidatedEntities us-gaap:IntersegmentEliminationNA-744.663-469.893-448.377-334.654-411.922-369.232-380.414-415.622-461.94-473.527-525.791-570.234NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidatedEntities,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,stld:MetalsRecyclingOperations█▇▄▃▁▃▂▃▃▄▄▅▅▄1151.1061079.912721.24636.473416.688628.739525.295574.908656.766737.045765.339800.014884.095752.766NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidatedEntities,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,stld:SteelFabricationOperations█▄▂▃▂▂▃▃▃▂▄▄▂▁331.715259.02219.905246.59218.428221.441246.45246.716241.424228.669251.607250.745217.896201.703NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidatedEntities,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,stld:SteelOperations█▅▂▁▁▂▂▂▃▃▃▅▄▂3394.4422642.8471964.3031775.7841699.3982016.1521837.6242008.2052188.1852200.1652259.0642586.6262435.6881981.774NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  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 _ _█▆▄▄▄▄▄▄▄▅▅▆▆▅▄▄▄▅▃▄▄▄▁▄▃▄▃▄▄▃▄▄▃▃▃▃▄▄▃▄▄▄▃955.735594.199258.75155.856158.85273.686181.961228.045285.032291.842365.553531.572501.887323.397195.947271.015265.353334.56656.024283.855256.122131.965-381.143131.02977.55999.771-81.16188.643131.90580.932107.822113.27369.19896.23294.92972.721103.699119.81682.49108.785188.219205.32646.821NANANA
  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 us-gaap:ConsolidatedEntities,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,us-gaap:CorporateAndOther██▇▂▂▁▄▁▁▁22.923.021.09.69.78.214.58.78.49.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax █▅▂▁▁▂▁▂▂▂▃▄▄▃▃▂▂728.968434.272189.65100.02275.682187.377121.379151.009194.25204.157270.347398.438362.344227.551304.733153.258153.933NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest █▇█▅▄▄▄▃▄▃▂▂▂▁▁▁▂9.9128.2489.1074.1343.2693.4962.2941.562.4440.499-0.152-0.4690.123-2.076-1.562-2.246-0.986NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest █▆▄▄▃▄▄▄▄▄▅▆▅▄▅▄▄▄▃▄▄▃▁▃▃▃738.88442.52198.757104.15678.951190.873123.673152.569196.694204.656270.195397.969362.467225.475303.171151.012152.947198.6663.832154.413140.44361.318-256.31658.86725.32526.954NANANANANANANANANANANANA25.779NANANANANANANA
us-gaap:CostOfGoodsAndServicesSold █▅▃▂▁▃▂▃▄▄▄▄▄▃3265.6162744.3312158.9922038.0171809.8742159.8712033.7872167.0062349.3492383.8652382.6572537.4662438.4432140.459NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:GrossProfit █▅▃▂▂▃▂▂▃▃▄▅▄▃▂▃▃▃▂▃▃▂▁▂▁▁▂▂▂▁▁▁▁▁▁▁▁▁▁▁▂▂▁▁▁▂1199.692800.266442.253292.815284.431415.229316.409359.839421.166433.57521.235686.081652.082463.416320.824396.518392.518472.154309.942408.503380.383236.036144.207228.726171.743187.042291.624288.512222.771163.304197.996197.192147.692176.264180.097156.401182.136201.264160.135199.243276.386295.754133.668139.532191.984210.482
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest █▆▄▄▄▄▄▄▅▅▅▆▆▅▄▄▄▅▃▄▄▄▁▄▃▃▃▄▄▃▄▄▃▃▄▃▄▄▃▄▄▄▃▃▄930.798566.859220.817133.36103.045248.256150.063201.251256.96267.063341.285507.115475.41295.964161.352234.312235.319304.2522.82243.305221.29496.714-417.92393.70641.60840.492-124.467134.667103.60950.99477.04784.15538.97962.64963.9047.22164.48568.45641.01467.606149.152166.5477.95930.92976.708NA
us-gaap:IncomeTaxExpenseBenefit █▆▄▅▄▅▄▅▅▅▅▆▆▅▁▆▅▆▄▆▅▅▁▅▄▄▃▅▅▄▅▅▄▄▄▄▄▄▄▄▅▅▄▄▅▅218.595128.10423.86729.08324.2857.4226.34448.64360.21462.23671.433109.209112.83870.489-141.81983.382.372105.586-1.01288.89280.85135.396-161.60734.83916.28313.538-28.42147.0137.26817.29629.14633.06515.70621.3978.811.11625.1826.67915.23527.74953.32662.3173.90115.57429.91134.474
us-gaap:IncomeTaxesPaidNet █▃▃▄▃▃▄▄▆▃▆▇▅▂▄▆█▃▅▅▄▃▃▃▃▂▄▄▄▃▄▃▄▃▃▃▄▂▃▃▅▃▂▃▁▂146.0022.1424.56943.91.430.51839.37629.79484.5161.83989.677119.80279.995-1.04549.793.123152.1161.55455.82675.8627.5650.6990.4211.1727.046-18.53934.08241.26743.0082.14330.8533.02227.3611.1652.9243.62941.302-0.9551.52212.40360.4551.52-11.281-0.012-41.997-13.01
us-gaap:InterestExpense ▁▂▂▂▄▄▅▅▅▅▅▅▅▅▅▅▅▅▆▆▆▆▆▆▆██▅▅▅▅▅▅▆▆▇▇▇███████▆14.89817.26920.20618.9527.70228.01932.32231.33932.32131.12231.65231.5631.51231.89632.3834.17733.86933.97336.14936.19936.64637.04336.61637.08437.16343.08744.7431.90430.0530.56930.66430.9731.46534.62934.87741.4941.10641.11244.11744.70244.81243.34644.9844.28643.44837.515
us-gaap:InterestPaidNet ▅▁▄▁█▁█▁▇▁▇▁▇▁▇▂41.72711.31534.5418.59759.6688.78562.8489.11553.9818.60653.5368.64353.2268.62955.22613.53NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ███▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▅▇▇▇▇▇▆▆▁▆▆▆▆▆▆▆▆▆▆▆▆▆▇▇▆▆▇▇9.9128.2489.1074.1343.2693.4962.2941.562.4440.499-0.152-0.4690.123-2.076-1.562-2.246-0.986-2.151-16.18-2.984-1.526-1.419-3.077-1.75-6.225-3.807-51.015-3.516-5.962-4.881-6.754-6.396-5.685-6.963-5.477-6.728-5.167-3.898-4.424-3.447-2.884-1.673-3.734-3.386-2.41-1.58
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic █▆▄▄▃▄▄▄▄▄▅▆▆▅▅▄▄▄▃▄▄▃▁▃▃▃▃▄▃▃▃▃▃▃▃▃▃▃▃▃▄▄▃▃▃▃702.291430.507187.843100.14375.496187.34121.425151.048194.302204.328270.004398.375362.449227.551304.733153.258153.933200.81720.012157.397141.96962.737-253.23960.61731.5530.761-45.03191.17372.30338.57954.65557.48628.95848.21560.57112.83344.47245.67530.20343.30498.71105.9037.79218.74149.20764.969
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted █▆▄▄▃▄▄▄▄▄▅▆▆▅▅▄▄▄▃▄▄▃▁▃▃▃▃▄▃▃▃▃▃▃▃▃▃▃▃▃▄▄▃▃▃702.291430.507187.843100.14375.496187.34121.425151.048194.302204.328270.004398.375362.449227.551304.733153.258153.933200.81720.012157.397141.96962.737-253.23960.61731.5530.761-45.03191.17374.27240.93757.01359.84428.95850.57362.92912.83346.8348.03332.56145.662101.068108.26110.16921.11851.584NA
us-gaap:OperatingIncomeLoss █▆▄▄▄▄▄▄▄▅▅▆▆▅▄▄▄▅▃▄▄▄▁▄▃▄▃▄▄▃▄▄▃▃▃▃▄▄▃▄▄▄▃▃▄▄955.735594.199258.75155.856158.85273.686181.961228.045285.032291.842365.553531.572501.887323.397195.947271.015265.353334.56656.024283.855256.122131.965-381.143131.02977.55999.771-81.16188.643131.90580.932107.822113.27369.19896.23294.92972.721103.699119.81682.49108.785188.219205.32646.82169.0116.635132.297
us-gaap:OtherNonoperatingIncomeExpense ▅▅▃▆▁▇▇▇▇████▇▆▆▇▇▃▆▇▇▇▆▇▃▇▂▇▇▇▇▇▇▇▂▇▅▇▇█▇██▇▇-10.039-10.071-17.727-3.546-28.1032.5890.4244.5454.2496.3437.3847.1035.0354.463-2.215-2.5263.8353.659-17.055-4.3511.8181.792-0.164-0.2391.212-16.1921.433-22.0721.7540.631-0.1111.8521.2461.0463.852-24.011.892-10.2482.6413.5235.7454.5676.1186.2153.5213.081
us-gaap:ProfitLoss █▆▄▄▃▄▄▄▄▄▅▆▅▄▅▄▄▄▃▄▄▃▁▃▃▃▂▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄▃▃▃▃712.203438.755196.95104.27778.765190.836123.719152.608196.746204.827269.852397.906362.572225.475303.171151.012152.947198.6663.832154.413140.44361.318-256.31658.86725.32526.954-96.04687.65766.34133.69847.90151.0923.27341.25255.0946.10539.30541.77725.77939.85795.826104.234.05815.35546.79763.389
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▆▄▃▂▄▃▃▄▄▄▅▅▄▃▃▃▃▂▂▂▁▁▂▂▂▃▃▂▂▂▂▂▂▁▁▂▂▂▂▂▂▁▁▁▁4453.5563537.6252601.2452327.2242092.9642571.5442350.1962523.2792766.3642814.4862903.8923220.8913083.8222603.8752336.4792443.3822390.722368.2161910.5962060.5961978.9841698.0041591.0461901.4151945.9832003.9732517.0932276.7471987.6351765.8811864.151838.4641735.421728.4011705.0011624.5611830.1171905.0751858.3451976.2962004.2831941.6641528.1341520.3461570.0931496.082
us-gaap:Revenues █▆▄▃▂▄▃▃▄▄▄▅▅▄▃▃▃▃▂▂▂▁▁▂▂▂▃▃▂▂▂▂▂▂▁▁▂▂▂▂▂▂▁▁▁▁4465.3083544.5972601.2452330.8322094.3052575.12350.1962526.8452770.5152817.4352903.8923223.5473090.5252603.8752336.4792443.3822390.722368.2161910.5962060.5961978.9841698.0041591.0461901.4151945.9832003.9732517.0932276.7471987.6351765.8811864.151838.4641735.421728.4011705.0011624.5611830.1171905.0751858.3451976.2962004.2831941.6641528.1341520.3461570.0931496.082
  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 █▇▆▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▂▃▂▂▂▃▃▃▃▄▂▂▂▁▁▂▁▁▂▂▂▂▁▁▁▁▁10687.33110127.8969265.5628617.5568468.3418344.9238275.7657943.2477857.9147857.2337703.5637798.3687504.5216972.8136855.7326960.7376670.136704.0356423.7326787.5626629.6766391.6426202.0826842.5416826.7636735.8387311.0277578.2835985.2025913.8575933.0065874.3055735.915956.5745815.4165775.5165971.386043.6275979.2266003.4815900.4535827.6055589.9345610.4595545.805NA
us-gaap:Liabilities █▇▆▄▄▃▃▂▂▂▂▂▂▁▁▂▁▂▁5656.9795392.6994917.3364418.7574328.4194238.9844210.913898.8923809.6333867.7753816.3343812.2913804.7623549.4363549.4243899.7163630.6493709.3283535.033NANANA3530.6313886.7563902.0633812.7454389.164540.2943025.9923279.5273320.6373316.5173220.4393450.573338.763342.6883539.823637.1423608.6323656.4513588.9653599.9113458.8043506.7833448.206NA
us-gaap:LiabilitiesAndStockholdersEquity █▇▆▅▅▅▅▄▄▄▄▄▄▃▃▃▂▃▂▃▂▂▂▃▃▃▃▄▂▁▁▁▁▂▁▁▂▂▂▂▁▁▁10687.33110127.8969265.5628617.5568468.3418344.9238275.7657943.2477857.9147857.2337703.5637798.3687504.5216972.8136855.7326960.7376670.136704.0356423.7326787.5626629.6766391.6426202.0826842.5416826.7636735.8387311.0277578.2835985.2025913.8575933.0065874.3055735.915956.5745815.4165775.5165971.386043.6275979.2266003.4815900.4535827.6055589.934NANANA
us-gaap:StockholdersEquity █▇▆▆▆▆▆▆▆▆▅▆▅▄▄▃▃▃▃▃▃▂▂▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁5020.1144728.7924345.1644201.1834145.254113.5264075.8344056.6414064.494008.1113935.0714033.7683746.9813470.7193351.5743104.7253080.9393035.1792927.022965.9172835.8372717.2092679.7272959.8962927.4132918.0772795.5272978.0842897.8972568.7952495.8552447.7342410.7372406.592377.8422339.0542354.1362332.5612299.92282.6662257.1942190.6912092.87NANANA
  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 █▇▆▅▅▆▆▅▅▅▅▆▅▅▄▄▄▄▃▃▃▃▂▂▂▂▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁5265.1094896.9064258.4473854.8954016.124142.9684253.0254020.324023.6014028.894032.6574131.4773817.6643652.2423508.3423572.1453251.6573244.9652929.6753136.6443050.4572774.2332537.9412651.7952591.3922452.2252973.7652930.1362630.1862528.3542473.6342385.3152242.0892448.9412296.2252262.2242458.3442526.8572455.2582496.2272373.8592277.122000.003NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▆▇▇▇█▇▇▆▅▄▅▅▄▅▆▆▅▅▅▆▆▅▄▃▂▁▂▁▂▂▂▂▁▃▂▂▂▂▂▃▂▁▁▂▁▁1113.7441245.1651368.6181267.6181496.4581235.4781381.461146.007972.561791.444828.22884.315720.445985.8241028.6491101.964908.843966.826841.4831051.4891052.666976.951727.032473.79419.401160.982361.363159.591357.49342.919395.156370.056243.753477.861375.917287.12420.938357.809390.761456.694277.691160.81186.513270.118191.593225.506
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▅▆▇▆█▆▇▅▃▂▂▂▁▃▄▄▃▃▂1119.2441250.671374.1221273.1221502.3421240.9841387.3971151.54978.779797.248834.423890.139726.424991.4211035.0851108.275915.448973.429848.105NANANA733.663NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent █▇▄▃▃▄▃▄▄▅▄▆▅▄▃▃▃▃▂▂▂▂▁▂▂▂▃▄▃▂▂▂▂▂▁▂▂▂▂▂▃▃▁1565.3171360.535967.981915.223841.593995.324841.378983.5151069.0611141.0381040.221224.4771175.795983.457846.415897.838866.716860.676703.565752.232758.145654.177579.333757.11772.309741.309859.8351013.503852.44760.654664.208722.867725.105703.896599.499656.517660.351737.531679.898764.715797.577828.514584.068NANANA
us-gaap:ReceivablesNetCurrent █▆▁1571.01366.5971.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InventoryNet █▇▅▄▃▄▄▄▅▅▅▅▅▄▃▃▃▂▂▂▂▁▁▂▂▃▄▄▂▂▂▂▂▂▂▂▂▂▂▁▂▂▁2481.8322217.5341843.5481609.2161567.0171644.5381689.0431767.021802.7591867.71859.1681853.8621787.1091600.0581519.3471487.5161418.7321361.551275.2111275.5751175.7161066.8231149.391321.3971292.0691453.2421618.4191664.2121320.8711332.1011314.7471192.0321168.4991170.1591202.5071209.0791252.1531270.9411199.5841158.8481195.1941186.1681114.063NANANA
us-gaap:OtherAssetsCurrent █▅▆▅▃▄▆▄▅▄▆▄▃▃▇▅▃▃▇▂▂▃▄▂▂▃▄▂▂▂▂▂▃▂▁▂▁▁▁▁▁▁▁98.50967.74474.36359.21939.04345.35176.01250.81861.24852.62872.7350.1139.92738.70591.50959.64837.18833.44283.19730.12128.07241.25847.91428.74432.00434.84655.65529.26323.21624.36325.16725.12633.02824.05619.57624.10715.81615.02915.22918.64615.16418.91319.243NANANA
  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:PropertyPlantAndEquipmentGross NANA7331.616NANANA6124.714NANANA5684.97NANANA5165.508NANANA5066.989NANANA5077.702NANANA5010.039NANANA3939.814NANANA3761.759NANANA3551.561NANANA3406.626NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:AssetUnderConstructionNANA1302.689NANANA390.676NANANA158.131NANANA91.433NANANA70.615NANANA76.074NANANA63.344NANANA153.821NANANA138.763NANANA127.019NANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:BuildingAndBuildingImprovementsNANA860.641NANANA805.381NANANA778.701NANANA723.504NANANA709.809NANANA706.708NANANA713.837NANANA550.226NANANA524.53NANANA496.976NANANA480.434NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LandAndLandImprovementsNANA340.495NANANA333.879NANANA331.926NANANA314.854NANANA311.005NANANA328.739NANANA334.583NANANA293.083NANANA288.36NANANA271.208NANANA257.756NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:MachineryAndEquipmentNANA4827.791NANANA4594.778NANANA4416.212NANANA4035.717NANANA3975.56NANANA3966.181NANANA3898.275NANANA2942.684NANANA2810.106NANANA2656.358NANANA2571.85NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA3226.047NANANA2988.828NANANA2739.203NANANA2489.604NANANA2279.774NANANA2126.492NANANA1886.133NANANA1713.68NANANA1530.561NANANA1357.816NANANA1193.293NANANA
us-gaap:AmortizationOfIntangibleAssets ▃▃▃▂▂▂▄▂▂▂▃▂▂▂▂▂▃▃▃▂▂▂▁▁▁▁▂▂▂▂▃▃▃▄▄▄▅▅▅▆▆▆▇███7.4387.4387.6726.9467.197.1918.8476.7047.0137.0137.4346.5916.8296.9267.0737.2727.4247.4247.4067.2087.2327.256.1786.3186.4936.3236.9186.7646.9346.9357.6957.8978.0518.1278.7228.8488.9918.9929.63410.15410.08210.08411.14911.29111.56511.581
us-gaap:PropertyPlantAndEquipmentNet █▇▇▆▅▄▄▄▃▃▃▃▃▂▃▃▃▃▃▃▃▃▃▄▄▄▄▅▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁4526.8924340.4114105.5693862.3753587.453327.6053135.8863031.7312947.2432936.8932945.7672901.6582909.0332657.9372675.9042708.7772729.7212760.5442787.2152928.2262885.8442914.1862951.213013.6593047.4013085.5873123.9063420.6542177.0072197.5032226.1342241.0672232.8522232.4132231.1982213.7032208.662199.5092193.7452168.4442176.3142187.6982213.333NANANA
us-gaap:Goodwill ▂▂▂▃▂▂▂▄▄▄▂▃▃▁▁▁▁▁▁▁▁▁▁████████████████████455.53456.378457.226474.52451.22452.068452.915540.913526.462530.716429.645502.9508.275386.045386.893388.518390.129391.74393.351399.867394.275395.872397.47740.243741.898743.528745.158727.128728.751730.36731.996733.65735.281736.912738.542740.192741.817743.441745.066746.737748.383750.029751.675NANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▃▃▃▃▃▃▄▁▂▂▂▁▁▁▂▂▂▂▂▃▂▂▂▄▄▅▅▆▅▅▅▅▆▆▆▆▆▇▇▇▇██309.7317.139324.577306.574313.52320.711327.901249.598256.302263.315270.328236.563243.154249.983256.909263.357269.129276.553283.977291.814265.476272.528278.96353.561358.402364.62370.669406.318372.819379.488386.159393.531401.104408.832416.635425.034433.559442.277450.893460.206469.719479.48489.24NANANA
us-gaap:FiniteLivedIntangibleAssetsNet NANA324.577NANANANANANANANANANANANANANANANANANANANANANANA180.869NANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset NANA90.28NANANA75.17674.84377.86872.219NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent █▇▇▇▆▆▇▆▆▆▂▂▂▂▁▁▁▁▁▁▁▁▁▄▄▅▅▅▄▄▆▆▆▇▇▇▆▇▇▇▇▇▇130.1117.062119.743119.192100.031101.571106.038100.685104.30697.41925.16625.7726.39526.60610.74510.84812.12112.38711.45411.4414.06915.2216.93663.66268.09970.63678.21775.7957.97959.56491.25697.726101.353106.076105.067106.927101.194104.549107.736111.104110.461111.83112.551NANANA
  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:AccountsPayableCurrent ██▅▄▄▄▃▃▃▃▃▄▄▃▃▃▃▃▂▂▂▂▁▂▂▂▃▄▂▂▂▂▂▂▂▂▂▂▂1167.1021113.25760.536702.991696.845602.875509.687518.909516.109582.284536.743595.286657.496544.419473.765512.29467.611514.788382.126427.79450.945407.405276.725378.594438.363367.267489.791621.579422.761401.539404.605411.201355.678401.407344.953364.38381.25462.492414.24NANANA335.031NANANA
us-gaap:AccruedIncomeTaxesCurrent █▆▁▁▃▂▁▁▁▃▂▂▄▂▁▁▁█▁▄▅▂▁▂▁▁▁▃▃▃▁▂▁▂▂▂▁▂▂▂▂▃▁80.5252.9692.3860.82725.41117.8062.0142.0743.03226.8967.46810.87238.27314.5643.6965.5965.58980.7415.59335.73343.3679.962.02314.2462.4115.1166.08626.94919.44823.5314.0237.6492.86213.43816.94112.0142.16414.38310.8814.84411.53119.645.227NANANA
us-gaap:AccruedLiabilitiesCurrent █▇▇▆▅▆▆▆▅▅▅▄▄▃▄▄▃▃▃▃▃▂▂▂▂▂▃▃▁▂▂▁▁▁▁▆▆▇▁█▆█▁200.849176.422178.618171.307154.243167.718175.405162.692151.161141.239146.613136.111130.234112.975125.138128.701118.337109.4113.556112.521105.37897.56799.824102.5197.21587.302107.607113.85186.48687.71589.88482.15780.20980.25781.9166.845168.928186.24780.947203.191173.44199.21177.574NANANA
us-gaap:LiabilitiesCurrent █▇▅▄▄▄▄▃▃▃▄▄▄▃▃▄▂▃▂▂▂▂▁▂▂▁▃▄▂▃▃▃▃▂▁▁▄▄▄▂▂▂▁1852.2451661.1891258.7871175.6281115.4261031.721006.6981005.275925.7361003.091019.1371049.6651058.586860.74868.5191066.529795.892881.447712.815794.113779.224673.046535.29677.858698.588618.334850.5821041.54713.223951.431975.178954.202869.849814.687609.677605.3991019.4491121.8681100.417717.467670.846689.644561.317NANANA
us-gaap:LongTermDebtCurrent ▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▄▁▁▁▁▁▁▁▁▂▁▂▃▂▆▆▆▆▅▁▁███▁▁93.50581.22686.89482.22973.92670.10689.35682.1572.13180.95824.23414.77618.2669.64628.795182.66119.9712.9653.63216.15518.04722.7716.6831.58435.07530.72746.46131.85861.761343.722341.544335.341324.241231.58229.63130.114439.912439.633444.0781.211.552NA8.924NANANA
us-gaap:OperatingLeaseLiabilityCurrent NANA17.702NANANA17.532NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  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 ███▄▄▄▅▂▂▂▁▁▁▁▁▂▁▁▁▃▃▃▃▃▄▄▇3100.03100.03102.6762700.02700.02700.02734.3442500.02500.02500.02376.7232400.02400.02400.02381.942500.02400.02400.02356.8262600.02600.02600.02594.6562600.02700.02700.03024.166NANANA2107.589NANANA2202.237NANANA2380.1NANANA2386.821NANANA
us-gaap:LongTermDebtNoncurrent ███▆▆▆▆▄▄▄▄▄▄▄▄▄▄▄▄▆▆▆▆▆▆▆██▁▁▁▁▁▃▃▃▂▂▂▄▄▄▄3016.4863016.23015.7822636.6152636.7222646.0122644.9882355.2432355.9172354.4272352.4892351.9792352.1272353.7032353.1452351.4832354.3372353.7442353.1942570.8372573.1862575.5282577.9762615.8192619.5742623.4442977.7062929.9941742.1281755.0281766.0451773.6191774.2432069.2142172.6062173.9251928.0971932.0191936.0222379.052377.7932378.282377.897NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet █▆▄▃▃▂▂▁▁652.059602.185536.288512.503503.034489.248484.169468.248457.784NA435.838NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:MinorityInterest ▁▁▁▁▁▁▂▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▃▃▃▃▆▆▆▆▇▇▇▇████████-166.176-157.209-155.552-157.798-157.742-158.601-154.593-155.9-156.139-158.583-159.082-158.931-158.462-158.582-156.506-154.944-152.698-151.712-149.561-140.555-137.571-136.043-134.616-130.451-128.685-121.324-117.488-66.435-62.867-56.299-51.468-44.703-38.262-32.543-27.623-23.971-17.213-13.663-16.041-18.902-18.705-17.291-16.035NANANA
us-gaap:OtherLiabilitiesNoncurrent █▇▆▆▅▄▅▄▄▄▁▁▂▂▂▂▂▂▂▂▂▂▁▁▁▁▂▂▂▂▂▂▂▂▂▂▅▅▅▅▄▄▄136.189113.125106.47994.01173.23772.00475.05570.12670.19663.1718.8711.83318.3320.25721.81120.30520.78119.71120.64920.75119.54419.30216.59516.40516.14715.93618.83924.92222.35622.84323.37622.89820.32419.94719.17318.56481.79582.61382.27877.39163.79462.94462.159NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent NANA72.614NANANA57.897NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA17.165NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA14.057NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA11.418NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA8.888NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA34.159NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  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 █▇▆▆▆▆▆▆▆▆▅▆▅▄▄▃▃▃▃▃▃▂▂▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁5020.1144728.7924345.1644201.1834145.254113.5264075.8344056.6414064.494008.1113935.0714033.7683746.9813470.7193351.5743104.7253080.9393035.1792927.022965.9172835.8372717.2092679.7272959.8962927.4132918.0772795.5272978.0842897.8972568.7952495.8552447.7342410.7372406.592377.8422339.0542354.1362332.5612299.92282.6662257.1942190.6912092.87NANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest █▇▆▆▆▆▆▆▆▅▅▆▅▄▄▃▃▃▃▃▃▂▂▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁4853.9384571.5834189.6124043.3853987.5083954.9253921.2413900.7413908.3513849.5283775.9893874.8373588.5193312.1373195.0682949.7812928.2412883.4672777.4592825.3622698.2662581.1662545.1112829.4452798.7282796.7532913.0152911.6492835.032512.4962547.3232492.4372448.9992439.1332405.4652363.0252371.3492346.2242315.9412301.5682275.8992173.42076.835NANANA
us-gaap:CommonStockValue ███▇▇▇▇▆▆▆▆▆▆▆▆▄▄▄▄▄▄▄▃▂▂▂▂█▇▇▆▄▄▄▃▂▂▂▂▂▂▂▁0.6480.6480.6480.6460.6460.6460.6460.6450.6450.6450.6450.6440.6440.6440.6440.6410.6410.6410.6410.640.6390.6390.6380.6360.6360.6350.6350.6490.6470.6460.6450.6410.640.6390.6370.6360.6360.6360.6360.6360.6360.6350.633NANANA
us-gaap:AdditionalPaidInCapitalCommonStock ████▇▇▇▇▇▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▄▄▄▄▃▄▄▃▃▃▂▂▂▂▂▂▂▁▁1210.8331202.9451207.3921200.2281191.6141183.7761181.0121175.5121167.5051160.1391160.0481156.5561149.3671142.8711141.5341147.4631141.051135.8921132.7491132.3651125.5191115.0081110.2531104.8321099.6691088.6051083.4351075.5931058.9211092.2811085.6941060.781050.471045.9731037.6871033.8571033.0861031.0431026.1571023.2951019.0611010.698998.728NANANA
us-gaap:RetainedEarningsAccumulatedDeficit █▇▆▆▆▆▆▅▅▅▅▄▄▃▃▂▂▂▂▂▁▁▁▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁5783.1845134.3984758.9694624.0194576.6294553.8824419.2964349.5234250.4194109.0343958.323730.6623376.1633057.9042874.6932606.8312490.3732373.7182210.4592224.9632101.7291993.911965.2912250.9012223.5992225.3542227.8432300.662237.1472192.4132179.5132149.3892116.2622111.5972087.622049.0112058.1082035.5692011.8012003.4861982.0511905.2071821.133NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax █▂▁▁▁▁▁▁▁▁▁▁▁32.3445.6671.9020.0950.2160.03-0.0070.0390.0780.130.301-0.042-0.105NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:TreasuryStockValue █▆▆▆▆▆▆▆▅▅▄▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂2006.8951614.8661623.7471623.8051623.8551624.8081525.1131469.0781354.1571261.8371184.243854.052779.088730.7665.297650.21551.125475.072416.829392.051392.05392.348396.455396.473396.491396.517398.898398.818398.818716.545718.529718.373718.373719.076720.479720.479720.481721.024722.653725.849725.849725.849727.624NANANA
us-gaap:MinorityInterest ▁▁▁▁▁▁▂▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▃▃▃▃▆▆▆▆▇▇▇▇████████-166.176-157.209-155.552-157.798-157.742-158.601-154.593-155.9-156.139-158.583-159.082-158.931-158.462-158.582-156.506-154.944-152.698-151.712-149.561-140.555-137.571-136.043-134.616-130.451-128.685-121.324-117.488-66.435-62.867-56.299-51.468-44.703-38.262-32.543-27.623-23.971-17.213-13.663-16.041-18.902-18.705-17.291-16.035NANANA
us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders █▁18.8799.905NANA2.417.504NA1.321NANA-0.0010.00.003NANANANANANA0.00.0020.0080.0060.0161.1360.0290.0380.0520.6140.0390.0450.0450.0480.3010.0410.030.0420.0380.0590.002NANANANANANA
  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 █▄▂▂▇▃▆▆▅▂▇▆▄▂▃▃▁▃587.23262.191137.951151.79486.01211.281409.062444.202361.473181.553491.061420.44326.033177.935192.126225.85481.01240.43NANANANANANANANANANANANANANANANANANANANANANA165.9973.937NANA19.35172.742
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▄▃▄▆▆▃▇█▇▆▆▁▇████-275.347-309.473-343.224-316.734-159.265-174.036-349.169-110.455-24.638-92.424-171.251-132.681-500.955-90.377-36.227-47.232-40.887-14.759NANANANANANANANANANANANANANANANANANANANANANA-32.834-19.836NANA-39.983-30.18
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▄█▅▅▃▇▄▄▄▂▄▄▄▃▅▄▄-443.309-76.17306.273-64.276-65.387-183.658175.964-160.986-155.304-126.304-375.526-124.044-90.075-131.222-229.08914.205-98.104-100.347NANANANANANANANANANANANANANANANANANANANANANA-16.282-9.804NANA-13.281173.936
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▃▃▆▁█▃█▇▇▄▄▇▁▄▄▇▄-131.426-123.452101.0-229.22261.358-146.413235.857172.761181.531-37.175-55.716163.715-264.997-43.664-73.19192.827-57.981NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  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:DeferredIncomeTaxExpenseBenefit NANA14.78710.38814.6345.92713.37911.31111.5512.09113.80623.89911.993NANANANANANANANANANANANANA-13.371-3.417NANA-4.8939.861NANANANANANA1.3377.1189.02812.93524.4772.73510.4178.468
us-gaap:DepreciationDepletionAndAmortization ███▇▆▇▇▆▇▇▇▇▆▆▅▅▅▅▅▅▅▅▅▅▅▅▇▃▂▂▂▂▁▂▁▂▁▁▁▁▁▁▁▂▁▁87.04786.91985.05781.75278.72180.25980.52779.4780.91180.17480.5681.38379.1276.13574.93175.2173.80175.05773.13974.1974.79573.98573.28974.21174.27372.82281.35965.95758.44157.56858.83958.20256.82657.06155.18958.95355.50255.57255.64255.96256.25754.74655.7557.27855.39856.272
us-gaap:IncreaseDecreaseInAccountsPayable ▄█▄▃▄▄▂▃▂▃▂▃▄▄▂▃▂▅▃▂▄▄▁▂▄▁▁▃▃▃▃▄▂▃▃▃▂▃▂▃▃▄▃▃▂▅63.155360.68160.7450.64569.52351.596-32.2781.111-58.4843.206-62.464-14.88348.91966.332-37.18944.887-45.445133.809-10.699-49.17153.732112.659-100.017-62.75762.735-127.053-104.2579.6913.3855.041-12.27859.801-46.3738.988-13.5786.92-60.83734.902-35.999-4.3752.7594.175-11.895-12.446-22.707118.217
us-gaap:IncreaseDecreaseInAccountsReceivable ▆█▄▄▁▅▂▂▂▄▁▄▅▅▃▄▃▅▃▃▅▄▁▃▄▂▁▃▄▄▃▃▄▅▂▃▂▄▂▃▃▆▃▄▃▆204.561394.54553.92958.271-154.352154.072-142.61-85.633-70.62461.062-184.43448.024163.465118.818-54.17936.1233.746153.364-43.193-29.384103.59875.596-189.006-36.36147.149-133.084-155.5-30.95599.69688.95-52.273-0.25419.826110.938-70.373-2.69-73.73460.82-93.077-33.533-34.536261.748-31.98126.82-21.423223.14
us-gaap:IncreaseDecreaseInInventories ▇█▆▄▂▃▂▃▂▃▃▄▄▄▄▄▄▄▃▄▅▂▁▃▁▁▃▃▃▃▅▃▃▃▃▃▃▄▄▃▃▄▅▃▅▄264.935374.588234.38638.236-77.521-44.505-77.977-35.479-64.941-39.4695.30569.88590.31280.71131.15767.28557.62286.81913.23676.013108.893-82.567-170.5938.763-161.174-164.999-47.642-27.212-11.2317.354118.38523.648-1.66-32.348-7.143-43.005-18.78755.0940.736-36.3469.02672.107105.754-9.715117.01348.058
us-gaap:NetCashProvidedByUsedInOperatingActivities █▄▂▂▇▃▆▆▅▂▇▆▄▂▃▃▁▃587.23262.191137.951151.79486.01211.281409.062444.202361.473181.553491.061420.44326.033177.935192.126225.85481.01240.43NANANANANANANANANANANANANANANANANANANANANANA165.9973.937NANA19.35172.742
us-gaap:ProfitLoss █▆▄▄▃▄▄▄▄▄▅▆▅▄▅▄▄▄▃▄▄▃▁▃▃▃▂▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄▃▃▃▃712.203438.755196.95104.27778.765190.836123.719152.608196.746204.827269.852397.906362.572225.475303.171151.012152.947198.6663.832154.413140.44361.318-256.31658.86725.32526.954-96.04687.65766.34133.69847.90151.0923.27341.25255.0946.10539.30541.77725.77939.85795.826104.234.05815.35546.79763.389
us-gaap:ShareBasedCompensation ▅▇█▅▅█▇▅▅▇▇▄▄▆▆▄▄▅▅▄▄▄▂▃▄▄▁▃▃▄▄▂▂▃▃▂▂▄▄▃▃▃▃▃▃▂9.80817.0418.7489.4869.5217.84414.4028.8419.0815.30814.4577.9788.04112.84111.6396.8756.3811.30310.0915.9247.2368.4052.3725.3326.3578.543-1.5565.1044.75.7685.8922.5152.3444.7533.0180.7382.6026.1235.9283.8333.8123.714.9643.6263.3292.769
  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 ▄▄▃▄▆▆▃▇█▇▆▆▁▇████-275.347-309.473-343.224-316.734-159.265-174.036-349.169-110.455-24.638-92.424-171.251-132.681-500.955-90.377-36.227-47.232-40.887-14.759NANANANANANANANANANANANANANANANANANANANANANA-32.834-19.836NANA-39.983-30.18
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▇▇██▇▅▄▄▂▂▂▂▂▂▁▂▂▁▂▂▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁277.206309.863343.157327.647309.716217.535158.258154.13185.1254.43662.91370.66855.20350.60637.18942.79543.27441.67774.99259.77435.68627.70828.04330.28622.82133.35128.87924.53133.53424.84140.09952.16249.23645.34664.83958.34254.78945.55575.21238.12634.97618.69337.52624.22440.9630.684
  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 ▁▄█▅▅▃▇▄▄▄▂▄▄▄▃▅▄▄-443.309-76.17306.273-64.276-65.387-183.658175.964-160.986-155.304-126.304-375.526-124.044-90.075-131.222-229.08914.205-98.104-100.347NANANANANANANANANANANANANANANANANANANANANANA-16.282-9.804NANA-13.281173.936
us-gaap:PaymentsOfDividendsCommonStock █████▇▇██▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁54.91652.72952.59152.59252.58451.48151.77852.75153.50342.23943.76744.08144.26836.79736.72837.1837.52734.1334.12834.12434.0933.42533.28833.28233.23327.76627.64227.55625.66624.51524.34824.27424.23821.95221.92321.91521.90821.88721.86921.86521.8316.31816.27616.2616.23316.2
us-gaap:PaymentsForRepurchaseOfCommonStock 393.198NA0.00.00.0106.52956.214114.9593.13684.308330.1974.96549.14569.26915.08899.08576.81361.256NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  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:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value0.6480.6480.6480.6460.6460.6460.6460.6450.6450.6450.6450.6440.6440.6440.6440.6410.6410.6410.6410.640.6390.6390.6380.6360.6360.6350.6350.6490.6470.6460.6450.6410.640.6390.6370.6360.6360.6360.6360.6360.6360.6350.6330.629
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStock


Common
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
Value210214225237243243241222219218217216181
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value211212211211214219222224235236237240243244245245244243243242242242241239221238220236236235236236234234234
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value209211210210213217221224234235236239241242243243243242241241240226223220220219219219218218218217216216216
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value3.352.040.890.480.360.880.560.690.880.911.181.71.540.961.280.640.640.830.080.650.580.26-1.040.250.130.13-0.190.380.320.170.250.260.130.220.280.060.20.210.140.20.450.490.040.090.230.3
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
Value3.322.030.890.470.360.880.560.690.870.911.171.691.530.961.280.640.630.820.080.640.580.26-1.040.250.130.13-0.190.380.310.170.240.250.130.210.270.060.20.20.140.190.430.460.040.090.220.29
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:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2223219.69.78.2148.78.49.0
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.70.80.40.50.30.60.30.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value72843418910075187121151194204270398362227304153153
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.412.37.34.33.67.35.26.07.07.39.312.411.78.713.06.36.4

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value9.9128.2489.1074.1343.2693.4962.2941.562.4440.499-0.152-0.4690.123-2.076-1.562-2.246-0.986
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.40.20.20.10.10.10.10.0-0.0-0.00.0-0.1-0.1-0.1-0.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312011-12-31
Value738442198104781901231521962042703973622253031511521983.83215414061-256.31658252625
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.612.57.64.53.87.45.36.07.17.39.312.411.88.713.06.26.48.40.27.57.13.6-16.13.11.31.31.4

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value32652744215820381809215920332167234923832382253724382140
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax73.377.683.087.686.584.086.585.984.984.782.178.879.182.2

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
Value1199800442292284415316359421433521686652463320396392472309408380236144228171187291288222163197197147176180156182201160199276295133139191210
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 RevenueFromContractWithCustomerExcludingAssessedTax26.922.617.012.613.616.113.514.315.215.417.921.321.117.813.716.216.419.916.219.819.213.99.112.08.89.311.612.711.29.210.610.78.510.210.69.610.010.68.610.113.815.28.79.212.214.1

us-gaap:GrossProfit us-gaap:ConsolidatedEntities

us-gaap:IntersegmentElimination


Gross
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-13.0-8.01.44.5-3.3-0.40.44.5-2.15.9-2.9-4.8
Percentage of GrossProfit-1.6-1.80.51.6-0.8-0.10.11.1-0.51.1-0.4-0.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.4-0.30.10.2-0.1-0.00.00.2-0.10.2-0.1-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination0.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value9305662201331032481502012562673415074752951612342353042.8224322196-417.923934140-124.4671341035077843862637.221646841671491667.9593076
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.916.08.55.74.99.76.48.09.39.511.815.715.411.46.99.69.812.80.111.811.25.7-26.34.92.12.0-4.95.95.22.94.14.62.23.63.70.43.53.62.23.47.48.60.52.04.9

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ConsolidatedEntities

us-gaap:IntersegmentElimination


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-5.93-13.004-7.95-1.4064.173-3.282-0.3520.4114.2771.8845.897-2.935-4.766-0.27
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-0.6-2.3-3.6-1.14.0-1.3-0.20.21.70.71.7-0.6-1.0-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.4-0.3-0.10.2-0.1-0.00.00.20.10.2-0.1-0.2-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, stld:MetalsRecyclingOperations


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value48492412-12.6544.305-9.414-1.1596.51512132023
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest5.28.710.99.0-12.31.7-6.3-0.62.55.83.62.74.47.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.11.40.90.5-0.60.2-0.4-0.00.20.60.40.40.70.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments stld:MetalsRecyclingOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, stld:SteelFabricationOperations


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value279.064243825273134291913111218
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest3.01.611.028.825.211.221.016.911.57.23.92.32.76.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.30.91.61.21.11.31.41.10.70.50.40.40.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments stld:SteelFabricationOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, stld:SteelOperations


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1003626281126151273178217274293380557516315
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest107.8110.4127.595.1146.5110.2119.0108.2106.7109.7111.6110.0108.6106.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.517.710.85.47.210.67.68.69.910.413.117.316.712.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments stld:SteelOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-142.894-104.599-101.301-42.484-65.445-54.24-50.274-49.78-57.438-62.696-71.167-73.109-69.828-61.033
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-15.4-18.5-45.9-31.9-63.5-21.8-33.5-24.7-22.4-23.5-20.9-14.4-14.7-20.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.2-3.0-3.9-1.8-3.1-2.1-2.1-2.0-2.1-2.2-2.5-2.3-2.3-2.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value21812823292457264860627110911270-141.8198382105-1.012888035-161.607341613-28.421473717293315218.811.1162526152753623.901152934
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.93.60.91.21.22.21.11.92.22.22.53.43.72.7-6.13.43.44.5-0.14.34.12.1-10.21.80.80.7-1.12.11.91.01.61.80.91.20.50.11.41.40.81.42.73.20.31.01.92.3

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1462.1424.569431.430.5183929841.8398911979-1.04549931521.5545575270.6990.4211.1727.046-18.5393441432.143303.02227112.9243.62941-0.9551.52212601.52-11.281-0.012-41.997-13.01
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.30.10.21.90.10.01.71.23.10.13.13.72.6-0.02.13.86.40.12.93.71.40.00.00.10.4-0.91.41.82.20.11.70.21.60.60.20.22.3-0.10.10.63.00.1-0.7-0.0-2.7-0.9

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
Value14172018272832313231313131313234333336363637363737434431303030303134344141414444444344444337
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 RevenueFromContractWithCustomerExcludingAssessedTax0.30.50.80.81.31.11.41.21.21.11.11.01.01.21.41.41.41.41.91.81.92.22.32.01.92.21.81.41.51.71.61.71.82.02.02.62.22.22.42.32.22.22.92.92.82.5

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value4111348.597598.785629.115538.606538.643538.6295513
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.31.30.42.90.32.70.42.00.31.80.31.70.32.40.6

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value9.9128.2489.1074.1343.2693.4962.2941.562.4440.499-0.152-0.4690.123-2.076-1.562-2.246-0.986-2.151-16.18-2.984-1.526-1.419-3.077-1.75-6.225-3.807-51.015-3.516-5.962-4.881-6.754-6.396-5.685-6.963-5.477-6.728-5.167-3.898-4.424-3.447-2.884-1.673-3.734-3.386-2.41-1.58
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.40.20.20.10.10.10.10.0-0.0-0.00.0-0.1-0.1-0.1-0.0-0.1-0.8-0.1-0.1-0.1-0.2-0.1-0.3-0.2-2.0-0.2-0.3-0.3-0.4-0.3-0.3-0.4-0.3-0.4-0.3-0.2-0.2-0.2-0.1-0.1-0.2-0.2-0.2-0.1

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value702430187100751871211511942042703983622273041531532002015714162-253.239603130-45.03191723854572848601244453043981057.792184964
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.812.27.24.33.67.35.26.07.07.39.312.411.88.713.06.36.48.51.07.67.23.7-15.93.21.61.5-1.84.03.62.22.93.11.72.83.60.82.42.41.62.24.95.50.51.23.14.3

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value702430187100751871211511942042703983622273041531532002015714162-253.239603130-45.03191744057592850621246483245101108102151
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.812.27.24.33.67.35.26.07.07.39.312.411.88.713.06.36.48.51.07.67.23.7-15.93.21.61.5-1.84.03.72.33.13.31.72.93.70.82.62.51.82.35.05.60.71.43.3

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value95559425815515827318122828529136553150132319527126533456283256131-381.1431317799-81.161881318010711369969472103119821081882054669116132
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.516.89.96.77.610.67.79.010.310.412.616.516.312.48.411.111.114.12.913.812.97.8-24.06.94.05.0-3.28.36.64.65.86.24.05.65.64.55.76.34.45.59.410.63.14.57.48.8

us-gaap:OperatingIncomeLoss us-gaap:ConsolidatedEntities

us-gaap:IntersegmentElimination


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-5.573-12.716-7.666-1.1254.456-3.044-0.1360.6244.4912.0995.937-2.941-4.771-0.265
Percentage of OperatingIncomeLoss-0.6-2.1-3.0-0.72.8-1.1-0.10.31.60.71.6-0.6-1.0-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.4-0.3-0.00.2-0.1-0.00.00.20.10.2-0.1-0.2-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingIncomeLoss us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, stld:MetalsRecyclingOperations


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value47502312-8.7155.528-8.172-0.1017.6191613142224
Percentage of OperatingIncomeLoss5.08.59.18.1-5.52.0-4.5-0.02.75.83.82.84.57.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.11.40.90.5-0.40.2-0.3-0.00.30.60.50.50.70.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments stld:MetalsRecyclingOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, stld:SteelFabricationOperations


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value289.854253927293235302014131419
Percentage of OperatingIncomeLoss3.01.79.725.217.110.717.915.510.87.14.12.52.86.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.31.01.71.31.11.41.41.10.70.50.40.50.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments stld:SteelFabricationOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, stld:SteelOperations


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1012637293139168288195234291309397573533334
Percentage of OperatingIncomeLoss106.0107.3113.589.5105.8105.4107.4102.9102.2105.9108.9108.0106.3103.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.718.011.36.08.011.28.39.310.511.013.717.817.312.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments stld:SteelOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-127.694-90.913-75.697-34.384-32.089-46.355-37.645-42.441-49.153-56.92-67.058-67.113-63.618-55.406
Percentage of OperatingIncomeLoss-13.4-15.3-29.3-22.1-20.2-16.9-20.7-18.6-17.2-19.5-18.3-12.6-12.7-17.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.9-2.6-2.9-1.5-1.5-1.8-1.6-1.7-1.8-2.0-2.3-2.1-2.1-2.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value-10.039-10.071-17.727-3.546-28.1032.5890.4244.5454.2496.3437.3847.1035.0354.463-2.215-2.5263.8353.659-17.055-4.3511.8181.792-0.164-0.2391.212-16.1921.433-22.0721.7540.631-0.1111.8521.2461.0463.852-24.011.892-10.2482.6413.5235.7454.5676.1186.2153.5213.081
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.2-0.3-0.7-0.2-1.30.10.00.20.20.20.30.20.20.2-0.1-0.10.20.2-0.9-0.20.10.1-0.0-0.00.1-0.80.1-1.00.10.0-0.00.10.10.10.2-1.50.1-0.50.10.20.30.20.40.40.20.2

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value712438196104781901231521962042693973622253031511521983.83215414061-256.316582526-96.04687663347512341556.10539412539951044.058154663
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.012.47.64.53.87.45.36.07.17.39.312.411.88.713.06.26.48.40.27.57.13.6-16.13.11.31.3-3.83.93.31.92.62.81.32.43.20.42.12.21.42.04.85.40.31.03.04.2

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value9.9128.2484.1343.2693.4961.562.4440.499-0.152-0.4690.123-6.225-3.807-3.516-5.962-4.881-6.396-5.685-6.963-6.728-5.167-3.898-4.424-3.447
Percentage of ProfitLoss1.41.94.04.21.81.01.20.2-0.1-0.10.0-24.6-14.1-4.0-9.0-14.5-12.5-24.4-16.9-110.2-13.1-9.3-17.2-8.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.20.20.10.10.10.0-0.0-0.00.0-0.3-0.2-0.2-0.3-0.3-0.3-0.3-0.4-0.4-0.3-0.2-0.2-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value7024301007518715119420427039836231309172385728481244453043
Percentage of ProfitLoss98.698.196.095.898.299.098.899.8100.1100.1100.0124.6114.1104.0109.0114.5112.5124.4116.9210.2113.1109.3117.2108.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.812.24.33.67.36.07.07.39.312.411.81.61.54.03.62.23.11.72.80.82.42.41.62.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value4453353726012327209225712350252327662814290332203083260323362443239023681910206019781698159119011945200325172276198717651864183817351728170516241830190518581976200419411528152015701496
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

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4465354426012330209425752350252627702817290332233090260323362443239023681910206019781698159119011945200325172276198717651864183817351728170516241830190518581976200419411528152015701496
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.3100.2100.0100.2100.1100.1100.0100.1100.2100.1100.0100.1100.2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ConsolidatedEntities

us-gaap:IntersegmentElimination


Revenuesus-gaap:
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-737.305-744.663-469.893-448.377-334.654-411.922-369.232-380.414-415.622-461.94-473.527-525.791-570.234-424.986
Percentage of Revenues-16.5-21.0-18.1-19.2-16.0-16.0-15.7-15.1-15.0-16.4-16.3-16.3-18.5-16.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-16.6-21.0-18.1-19.3-16.0-16.0-15.7-15.1-15.0-16.4-16.3-16.3-18.5-16.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, stld:MetalsRecyclingOperations


Revenuesus-gaap:
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
Value11511079721636416628525574656737765800884752
Percentage of Revenues25.830.527.727.319.924.422.422.823.726.226.424.828.628.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.830.527.727.319.924.422.422.823.726.226.424.828.728.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments stld:MetalsRecyclingOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, stld:SteelFabricationOperations


Revenuesus-gaap:
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
Value331259219246218221246246241228251250217201
Percentage of Revenues7.47.38.510.610.48.610.59.88.78.18.77.87.17.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.47.38.510.610.48.610.59.88.78.18.77.87.17.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments stld:SteelFabricationOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, stld:SteelOperations


Revenuesus-gaap:
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
Value33942642196417751699201618372008218822002259258624351981
Percentage of Revenues76.074.675.576.281.178.378.279.579.078.177.880.278.876.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax76.274.775.576.381.278.478.279.679.178.277.880.379.076.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments stld:SteelOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Revenuesus-gaap:
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
Value32530716512094120110779911310111112392
Percentage of Revenues7.38.76.45.24.54.74.73.13.64.03.53.54.03.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.38.76.45.24.54.74.73.13.64.03.53.54.03.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:OperatingSegments, stld:MetalsRecyclingOperations, stld:OtherSegments


Revenuesus-gaap:
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
Value575609374364260336282293333385412412459364
Percentage of Revenues12.917.214.415.612.413.112.011.612.013.714.212.814.914.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.917.214.415.612.413.112.011.712.113.714.212.814.914.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments stld:MetalsRecyclingOperations stld:OtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, stld:SteelFabricationOperations, stld:OtherSegments


Revenuesus-gaap:
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
Value0.8622.0361.9285.0523.1770.5060.2790.6370.00.1890.0150.120.4580.21
Percentage of Revenues0.00.10.10.20.20.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.10.10.20.20.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments stld:SteelFabricationOperations stld:OtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, stld:SteelOperations, stld:OtherSegments


Revenuesus-gaap:
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
Value15913293797174868581756011111059
Percentage of Revenues3.63.73.63.43.42.93.73.43.02.72.13.53.62.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.63.73.63.43.42.93.73.43.02.72.13.53.62.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments stld:SteelOperations stld:OtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:CorporateAndOther, stld:OtherSegments


Revenuesus-gaap:
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
Value1.1130.5590.2840.0620.00.0880.00.10.1210.2480.1231.2940.1240.147
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:CorporateAndOther stld:OtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidatedEntities, us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, country:US, stld:MetalsRecyclingOperations


Revenuesus-gaap:
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
Value449363256202126234193230262285294323347329
Percentage of Revenues10.110.39.98.76.19.18.29.19.510.110.110.011.312.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.110.39.98.76.19.18.29.19.510.210.110.011.312.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments country:US stld:MetalsRecyclingOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, country:US, stld:SteelFabricationOperations


Revenuesus-gaap:
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
Value330256217241214220245245240228251250217201
Percentage of Revenues7.47.28.410.410.38.610.59.78.78.18.77.87.07.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.47.38.410.410.38.610.59.78.78.18.77.87.17.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments country:US stld:SteelFabricationOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, country:US, stld:SteelOperations


Revenuesus-gaap:
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
Value30862400180016341578186016881838204020442115240021271832
Percentage of Revenues69.167.769.270.175.472.371.872.873.772.672.974.568.870.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax69.367.969.270.275.472.471.872.973.872.672.974.569.070.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments country:US stld:SteelOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, country:US, us-gaap:CorporateAndOther


Revenuesus-gaap:
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
Value3193041651209412098779911310111012292
Percentage of Revenues7.28.66.45.24.54.74.23.13.64.03.53.44.03.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.28.66.45.24.54.74.23.13.64.03.53.44.03.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments country:US us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:NonUs, stld:MetalsRecyclingOperations


Revenuesus-gaap:
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
Value125106907029574950606558637658
Percentage of Revenues2.83.03.53.01.42.22.12.02.22.32.02.02.52.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.83.03.53.01.42.22.12.02.22.32.02.02.52.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:NonUs stld:MetalsRecyclingOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:NonUs, stld:SteelFabricationOperations


Revenuesus-gaap:
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
Value0.1440.0220.0760.0980.30.2960.1650.9850.0510.0690.00.00.056
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:NonUs stld:SteelFabricationOperations0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:NonUs, stld:SteelOperations


Revenuesus-gaap:
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
Value1481097062498162836580827419789
Percentage of Revenues3.33.12.72.72.43.22.73.32.42.82.82.36.43.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.33.12.72.72.43.22.73.32.42.82.82.36.43.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:NonUs stld:SteelOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:NonUs, us-gaap:CorporateAndOther


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value4.5462.671-0.2990.1250.1710.26
Percentage of Revenues0.10.1-0.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.1-0.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:NonUs us-gaap:CorporateAndOther0.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidatedEntities, us-gaap:Subsegments

us-gaap:IntersegmentElimination, stld:OtherSegments


Revenuesus-gaap:
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-737.305-744.663-469.893-448.377-334.654-411.922-369.232-380.414-415.622-461.94-473.527-525.791-570.234-424.986
Percentage of Revenues-16.5-21.0-18.1-19.2-16.0-16.0-15.7-15.1-15.0-16.4-16.3-16.3-18.5-16.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-16.6-21.0-18.1-19.3-16.0-16.0-15.7-15.1-15.0-16.4-16.3-16.3-18.5-16.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination stld:OtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:StatementGeographical

country:US


Revenuesus-gaap:
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
Value4186332624402197201424362226239226432671276230852815245621942314227822271803200019261648149618311887192323722224196017151768180317011681
Percentage of Revenues93.893.893.894.396.294.694.794.795.494.895.195.791.194.393.994.795.394.194.497.197.497.194.196.397.096.094.297.798.697.194.998.198.197.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax94.094.093.894.496.294.894.794.895.694.995.195.891.394.393.994.795.394.194.497.197.497.194.196.397.096.094.297.798.697.194.998.198.197.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NonUs


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value27821816013380138124134126145140138274147141128112140107100969294119117123144114
Percentage of Revenues6.26.26.25.73.85.45.35.34.65.24.94.38.95.76.15.34.75.95.64.94.95.55.96.36.06.25.85.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.36.26.25.73.85.45.35.34.65.24.94.38.95.76.15.34.75.95.64.94.95.55.96.36.06.25.85.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NonUs0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value106871012792658617846883448275794378577857770377987504697268556960667067046423678766296391620268426826673573117578598559135933587457355956581557755971604359796003590058275589561055455129
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

us-gaap:IntersegmentElimination


Assetsus-gaap:
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-104.151-117.381-86.697-64.697-48.911-57.817-70.707-77.298-73.334-82.555-92.671
Percentage of Assets-1.0-1.2-0.9-0.8-0.6-0.7-0.9-1.0-0.9-1.1-1.2
Percentage of Assets-1.0-1.2-0.9-0.8-0.6-0.7-0.9-1.0-0.9-1.1-1.2
Percentage of Assets us-gaap:IntersegmentElimination100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, stld:MetalsRecyclingOperations


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1319126011161026867918940972987982946
Percentage of Assets12.312.412.011.910.211.011.412.212.612.512.3
Percentage of Assets12.312.412.011.910.211.011.412.212.612.512.3
Percentage of Assets us-gaap:OperatingSegments stld:MetalsRecyclingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, stld:SteelFabricationOperations


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value580443376373397405386414418407415
Percentage of Assets5.44.44.14.34.74.94.75.25.35.25.4
Percentage of Assets5.44.44.14.34.74.94.75.25.35.25.4
Percentage of Assets us-gaap:OperatingSegments stld:SteelFabricationOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, stld:SteelOperations


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value75397053628858395533545851715119521753785150
Percentage of Assets70.569.667.967.865.365.462.564.466.468.566.9
Percentage of Assets70.569.667.967.865.365.462.564.466.468.566.9
Percentage of Assets us-gaap:OperatingSegments stld:SteelOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value13521487157114421718161918481513130711701283
Percentage of Assets12.714.717.016.720.319.422.319.116.614.916.7
Percentage of Assets12.714.717.016.720.319.422.319.116.614.916.7
Percentage of Assets us-gaap:OperatingSegments us-gaap:CorporateAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value5656539249174418432842384210389838093867381638123804354935493899363037093535353038863902381243894540302532793320331632203450333833423539363736083656358835993458350634483126
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets52.953.253.151.351.150.850.949.148.549.249.548.950.750.951.856.054.455.355.056.956.857.256.660.059.950.655.556.056.556.157.957.457.959.360.260.460.960.861.861.962.562.260.9

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
Value1068710127926586178468834482757943785778577703779875046972685569606670670464236787662963916202684268266735731175785985591359335874573559565815577559716043597960035900582755895129
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 End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value502047284345420141454113407540564064400839354033374634703351310430803035292729652835271726792959292729182795297828972568249524472410240623772339235423322299228222572190209219881632
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets47.046.746.948.848.949.349.351.151.751.051.151.749.949.848.944.646.245.345.643.742.842.543.243.342.943.338.239.348.443.442.141.742.040.440.940.539.438.638.538.038.337.637.438.80.0

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
Value52654896425838544016414242534020402340284032413138173652350835723251324429293136305027742537265125912452297329302630252824732385224224482296226224582526245524962373227720001456
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 Assets49.348.446.044.747.449.651.450.651.251.352.353.050.952.451.251.348.748.445.646.246.043.440.938.838.036.440.738.743.942.841.740.639.141.139.539.241.241.841.141.640.239.135.828.4

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
Value1113124513681267149612351381114697279182888472098510281101908966841105110529767274734191603611593573423953702434773752874203573904562771601862701912259.0081628
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 Assets10.412.314.814.717.714.816.714.412.410.110.811.39.614.115.015.813.614.413.115.515.915.311.76.96.12.44.92.16.05.86.76.34.28.06.55.07.05.96.57.64.72.83.34.83.50.00.20.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value9931154127611621418116912981072916756811
Percentage of CashAndCashEquivalentsAtCarryingValue89.292.793.291.794.894.794.093.694.295.697.9
Percentage of Assets9.311.413.813.516.714.015.713.511.79.610.5
Percentage of Assets us-gaap:OperatingSegments us-gaap:CorporateAndOther73.577.681.280.682.572.270.370.870.164.663.2

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value1119125013741273150212401387115197879783489072699110351108915973848733
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.512.314.814.817.714.916.814.512.510.110.811.49.714.215.115.913.714.513.211.8

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


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
Value15651360967915841995841983106911411040122411759838468978668607037527586545797577727418591013852760664722725703599656660737679764797828584396
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets14.613.410.410.69.911.910.212.413.614.513.515.715.714.112.312.913.012.811.011.111.410.29.311.111.311.011.813.414.212.911.212.312.611.810.311.411.112.211.412.713.514.210.47.7

Receivables Net Current

us-gaap:ReceivablesNetCurrent

us-gaap:ReceivablesNetCurrent


Receivables
Period End2021-06-302021-03-312020-12-31
Value15711366971
Percentage of ReceivablesNetCurrent100.0100.0100.0
Percentage of Assets14.713.510.5

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
Value2481221718431609156716441689176718021867185918531787160015191487141813611275127511751066114913211292145316181664132013321314119211681170120212091252127011991158119511861114852
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 Assets23.221.919.918.718.519.720.422.222.923.824.123.823.822.922.221.421.320.319.918.817.716.718.519.318.921.622.122.022.122.522.220.320.419.620.720.921.021.020.119.320.320.419.916.6

us-gaap:InventoryNet us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value12095846126213736353633
Percentage of InventoryNet4.94.34.63.81.71.32.22.11.91.91.8
Percentage of Assets1.10.90.90.70.30.30.40.50.40.50.4
Percentage of Assets us-gaap:OperatingSegments us-gaap:CorporateAndOther8.96.45.44.31.61.32.02.42.73.12.6

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
Value986774593945765061527250393891593733833028414728323455292324252533241924151515181518199.856
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 Assets0.90.70.80.70.50.50.90.60.80.70.90.60.50.61.30.90.60.51.30.40.40.60.80.40.50.50.80.40.40.40.40.40.60.40.30.40.30.20.30.30.30.30.30.2

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value73316124568451655066507750103939376135513406
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets79.174.073.875.378.981.968.566.464.759.460.9

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AssetUnderConstruction


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value130239015891707663153138127
Percentage of PropertyPlantAndEquipmentGross17.86.42.81.81.41.51.33.93.73.6
Percentage of Assets14.14.72.11.31.11.20.92.62.42.1
Percentage of Assets us-gaap:AssetUnderConstruction0.00.00.00.00.00.00.00.00.00.0

us-gaap:BuildingAndBuildingImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value860805778723709706713550524496480
Percentage of PropertyPlantAndEquipmentGross11.713.113.714.014.013.914.214.013.914.014.1
Percentage of Assets9.39.710.110.611.011.49.89.39.08.38.6
Percentage of Assets us-gaap:BuildingAndBuildingImprovements0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LandAndLandImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value340333331314311328334293288271257
Percentage of PropertyPlantAndEquipmentGross4.65.55.86.16.16.56.77.47.77.67.6
Percentage of Assets3.74.04.34.64.85.34.64.95.04.54.6
Percentage of Assets us-gaap:LandAndLandImprovements0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:MachineryAndEquipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value48274594441640353975396638982942281026562571
Percentage of PropertyPlantAndEquipmentGross65.875.077.778.178.578.177.874.774.774.875.5
Percentage of Assets52.155.557.358.961.963.953.349.648.344.446.0
Percentage of Assets us-gaap:MachineryAndEquipment0.00.00.00.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value32262988273924892279212618861713153013571193
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets34.836.135.636.335.534.325.828.926.322.721.3

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7.4387.4387.6726.9467.197.1918.8476.7047.0137.0137.4346.5916.8296.9267.0737.2727.4247.4247.4067.2087.2327.256.1786.3186.4936.3236.9186.7646.9346.9357.6957.8978.0518.1278.7228.8488.9918.9929.63410101011111111
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value45264340410538623587332731353031294729362945290129092657267527082729276027872928288529142951301330473085312334202177219722262241223222322231221322082199219321682176218722132254
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 Assets42.442.944.344.842.439.937.938.237.537.438.237.238.838.139.038.940.941.243.443.143.545.647.644.044.645.842.745.136.437.237.538.238.937.538.438.337.036.436.736.136.937.539.643.9

us-gaap:PropertyPlantAndEquipmentNet us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value138133136152148148149271176152153
Percentage of PropertyPlantAndEquipmentNet3.13.13.34.04.14.54.89.06.05.25.2
Percentage of Assets1.31.31.51.81.81.81.83.42.21.92.0
Percentage of Assets us-gaap:OperatingSegments us-gaap:CorporateAndOther10.38.98.710.68.69.28.118.013.513.012.0

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value455456457474451452452540526530429502508386386388390391393399394395397740741743745727728730731733735736738740741743745746748750751758
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.34.54.95.55.35.45.56.86.76.85.66.46.85.55.65.65.85.86.15.95.96.26.410.810.911.010.29.612.212.312.312.512.812.412.712.812.412.312.512.412.712.913.414.8

us-gaap:Goodwill us-gaap:BusinessAcquisition

stld:ZimmerS.a.DeC.v.


Goodwillus-gaap:
Period End2020-08-03
Value24
Percentage of Goodwill0.0
Percentage of Assets0.0
Percentage of Assets stld:ZimmerS.a.DeC.v.0.0

us-gaap:Goodwill us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

stld:ZimmerS.a.DeC.v., stld:MetalsRecyclingOperations


Goodwillus-gaap:
Period End2020-12-312020-08-03
Value7.724
Percentage of Goodwill1.70.0
Percentage of Assets0.10.0
Percentage of Assets stld:ZimmerS.a.DeC.v. stld:MetalsRecyclingOperations0.00.0

us-gaap:Goodwill us-gaap:StatementBusinessSegments

stld:MetalsRecyclingOperations


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value181182183200177178178179182
Percentage of Goodwill39.839.940.142.239.339.439.533.242.4
Percentage of Assets1.71.82.02.32.12.12.22.32.4
Percentage of Assets stld:MetalsRecyclingOperations0.00.00.00.00.00.00.00.00.0

stld:SteelOperations


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value272272272272272272272359245
Percentage of Goodwill59.759.659.557.360.360.260.166.457.1
Percentage of Assets2.52.72.93.23.23.33.34.53.2
Percentage of Assets stld:SteelOperations0.00.00.00.00.00.00.00.00.0

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
Value309317324306313320327249256263270236243249256263269276283291265272278353358364370406372379386393401408416425433442450460469479489533
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 Assets2.93.13.53.63.73.84.03.13.33.43.53.03.23.63.73.84.04.14.44.34.04.34.55.25.25.45.15.46.26.46.56.77.06.97.27.47.37.37.57.78.08.28.810.4

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2020-12-312014-12-31
Value324180
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0
Percentage of Assets3.52.5

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value9075747772
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0
Percentage of Assets1.00.90.91.00.9

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
Value1301171191191001011061001049725252626101012121111141516636870787557599197101106105106101104107111110111112114
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 Assets1.21.21.31.41.21.21.31.31.31.20.30.30.40.40.20.20.20.20.20.20.20.20.30.91.01.01.11.01.01.01.51.71.81.81.81.91.71.71.81.91.91.92.02.2

us-gaap:OtherAssetsNoncurrent us-gaap:ConsolidatedEntities

us-gaap:IntersegmentElimination


Other
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-35.3-29.3-16.4-8.4-6.9-11.1-7.9-7.4-7.8-12.3-14.1
Percentage of OtherAssetsNoncurrent-27.1-25.0-13.7-7.0-6.9-10.9-7.5-7.3-7.5-12.6-56.0
Percentage of Assets-0.3-0.3-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.2-0.2
Percentage of Assets us-gaap:IntersegmentElimination33.925.018.913.014.119.211.29.610.614.915.2

us-gaap:OtherAssetsNoncurrent us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value4040484638447547564866
Percentage of OtherAssetsNoncurrent31.334.640.339.138.143.871.446.754.049.8263.1
Percentage of Assets0.40.40.50.50.40.50.90.60.70.60.9
Percentage of Assets us-gaap:OperatingSegments us-gaap:CorporateAndOther3.02.73.13.22.22.74.13.14.34.15.2

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value11671113760702696602509518516582536595657544473512467514382427450407276378438367489621422401404411355401344364381462414335
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.911.08.28.28.27.26.26.56.67.47.07.68.87.86.97.47.07.75.96.36.86.44.55.56.45.56.78.27.16.86.87.06.26.75.96.36.47.76.96.0

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


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
Value80522.3860.82725172.0142.0743.032267.4681038143.6965.5965.589805.59335439.962.023142.4115.1166.0862619234.0237.6492.8621316122.16414101411195.2275.664
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.50.00.00.30.20.00.00.00.30.10.10.50.20.10.10.11.20.10.50.70.20.00.20.00.10.10.40.30.40.10.10.00.20.30.20.00.20.20.20.20.30.10.1

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
Value2001761781711541671751621511411461361301121251281181091131121059799102978710711386878982808081166168186802031731997785
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 Assets1.91.71.92.01.82.02.12.01.91.81.91.71.71.61.81.81.81.61.81.71.61.51.61.51.41.31.51.51.41.51.51.41.41.31.42.92.83.11.43.42.93.41.41.7

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
Value18521661125811751115103110061005925100310191049105886086810667958817127947796735356776986188501041713951975954869814609605101911211100717670689561595
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 Assets17.316.413.613.613.212.412.212.711.812.813.213.514.112.312.715.311.913.111.111.711.810.58.69.910.29.211.613.711.916.116.416.215.213.710.510.517.118.618.412.011.411.810.011.6

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value938186827370898272802414189.64628182192.9653.63216182216313530461316134334133532423129304394394441.211.5528.924
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.80.91.00.90.81.11.00.91.00.30.20.20.10.42.60.30.00.10.20.30.40.30.50.50.50.61.71.05.85.85.75.73.90.50.57.47.37.40.00.00.2

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2020-12-312019-12-31
Value1717
Percentage of OperatingLeaseLiabilityCurrent100.0100.0
Percentage of Assets0.20.2

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value3100310031022700270027002734250025002500237624002400240023812500240024002356260026002600259426002700270030242107220223802386
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets29.030.633.531.331.932.433.031.531.831.830.930.832.034.434.735.936.035.836.738.339.240.741.838.039.640.141.435.537.939.842.7

us-gaap:LongTermDebt us-gaap:DebtInstrument

stld:Senior4.125PercentNotesDue2025


Long
Period End2020-10-31
Value350
Percentage of LongTermDebt0.0
Percentage of Assets0.0
Percentage of Assets stld:Senior4.125PercentNotesDue20250.0

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
Value30163016301526362636264626442355235523542352235123522353235323512354235323532570257325752577261526192623297729291742175517661773177420692172217319281932193623792377237823772054
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 Assets28.229.832.530.631.131.732.029.730.030.030.530.231.333.834.333.835.335.136.637.938.840.341.638.238.438.940.738.729.129.729.830.230.934.737.437.632.332.032.439.640.340.842.540.1

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value652602536512503489484468457435
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.15.95.85.95.95.95.95.95.85.7

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
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-166.176-157.209-155.552-157.798-157.742-158.601-154.593-155.9-156.139-158.583-159.082-158.931-158.462-158.582-156.506-154.944-152.698-151.712-149.561-140.555-137.571-136.043-134.616-130.451-128.685-121.324-117.488-66.435-62.867-56.299-51.468-44.703-38.262-32.543-27.623-23.971-17.213-13.663-16.041-18.902-18.705-17.291-16.03514
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-1.6-1.6-1.7-1.8-1.9-1.9-1.9-2.0-2.0-2.0-2.1-2.0-2.1-2.3-2.3-2.2-2.3-2.3-2.3-2.1-2.1-2.1-2.2-1.9-1.9-1.8-1.6-0.9-1.1-1.0-0.9-0.8-0.7-0.5-0.5-0.4-0.3-0.2-0.3-0.3-0.3-0.3-0.30.3

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
Value136113106947372757070638.87111820212020192020191916161615182422222322201919188182827763626260
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 Assets1.31.11.11.10.90.90.90.90.90.80.10.20.20.30.30.30.30.30.30.30.30.30.30.20.20.20.30.30.40.40.40.40.40.30.30.31.41.41.41.31.11.11.11.2

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2020-12-312019-12-31
Value7257
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0
Percentage of Assets0.80.7

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value17
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.2

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value14
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.2

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value11
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value8888000.0
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
Value34
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.4

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value9075757872
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets1.00.90.91.00.9

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value106
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets1.1

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value16
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.2

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value502047284345420141454113407540564064400839354033374634703351310430803035292729652835271726792959292729182795297828972568249524472410240623772339235423322299228222572190209219881632
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets47.046.746.948.848.949.349.351.151.751.051.151.749.949.848.944.646.245.345.643.742.842.543.243.342.943.338.239.348.443.442.141.742.040.440.940.539.438.638.538.038.337.637.438.80.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value4853457141894043398739543921390039083849377538743588331231952949292828832777282526982581254528292798279629132911283525122547249224482439240523632371234623152301227521732076200316321540
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets45.445.145.246.947.147.447.449.149.749.049.049.747.847.546.642.443.943.043.241.640.740.441.041.441.041.539.838.447.442.542.942.442.740.941.440.939.738.838.738.338.637.337.239.10.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

stld:RedeemableNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value17616315815515215114314313913911111111111111111111111111112612612612612612512612612612412111698
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest3.63.63.83.83.83.83.73.73.63.62.92.93.13.43.53.83.83.94.04.54.74.95.04.54.54.54.34.34.44.84.64.1
Percentage of Assets1.71.61.71.81.81.81.71.81.81.81.41.41.51.61.61.61.71.71.71.91.92.02.01.81.81.91.71.72.12.12.01.7
Percentage of Assets stld:RedeemableNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302008-12-312007-12-31
Value325.6671.9020.0950.2160.03-0.0070.0390.0780.130.301-0.042-0.105-1.4110.021
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.70.10.00.00.00.0-0.00.00.00.00.0-0.0-0.0-0.10.0
Percentage of Assets0.30.10.00.00.00.0-0.00.00.00.00.0-0.0-0.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-06-302010-12-312009-12-312008-12-312007-12-31
Value121012021207120011911183118111751167116011601156114911421141114711411135113211321125111511101104109910881083107510581092108510370.0998972541553
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest24.926.328.829.729.929.930.130.129.930.130.729.832.034.535.738.939.039.440.840.141.743.243.639.039.338.937.236.937.443.542.643.10.048.148.633.236.0
Percentage of Assets11.311.913.013.914.114.214.314.814.914.815.114.815.316.416.716.517.116.917.616.717.017.417.916.116.116.214.814.217.718.518.317.80.017.919.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-06-302010-12-312009-12-312008-12-312007-12-31
Value0.6480.6480.6480.6460.6460.6460.6460.6450.6450.6450.6450.6440.6440.6440.6440.6410.6410.6410.6410.640.6390.6390.6380.6360.6360.6350.6350.6490.6470.6460.6450.6370.00.6330.6290.5450.542
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-06-302010-12-312009-12-312008-12-312007-12-31
Value-166.176-157.209-155.552-157.798-157.742-158.601-154.593-155.9-156.139-158.583-159.082-158.931-158.462-158.582-156.506-154.944-152.698-151.712-149.561-140.555-137.571-136.043-134.616-130.451-128.685-121.324-117.488-66.435-62.867-56.299-51.468-27.6230.0-16.035148.42711
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-3.4-3.4-3.7-3.9-4.0-4.0-3.9-4.0-4.0-4.1-4.2-4.1-4.4-4.8-4.9-5.3-5.2-5.3-5.4-5.0-5.1-5.3-5.3-4.6-4.6-4.3-4.0-2.3-2.2-2.2-2.0-1.10.0-0.80.70.50.7
Percentage of Assets-1.6-1.6-1.7-1.8-1.9-1.9-1.9-2.0-2.0-2.0-2.1-2.0-2.1-2.3-2.3-2.2-2.3-2.3-2.3-2.1-2.1-2.1-2.2-1.9-1.9-1.8-1.6-0.9-1.1-1.0-0.9-0.50.0-0.30.30.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-06-302010-12-312009-12-312008-12-312007-12-31
Value578351344758462445764553441943494250410939583730337630572874260624902373221022242101199319652250222322252227230022372192217920870.01821174518201432
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest119.1112.3113.6114.4114.8115.1112.7111.5108.8106.7104.896.394.192.390.088.485.082.379.678.777.977.277.279.679.579.676.579.078.987.385.686.80.087.787.1111.593.0
Percentage of Assets54.150.751.453.754.054.653.454.854.152.351.447.845.043.941.937.537.335.434.432.831.731.231.732.932.633.030.530.437.437.136.735.90.032.634.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-06-302010-12-312009-12-312008-12-312007-12-31
Value-2006.895-1614.866-1623.747-1623.805-1623.855-1624.808-1525.113-1469.078-1354.157-1261.837-1184.243-854.052-779.088-730.7-665.297-650.21-551.125-475.072-416.829-392.051-392.05-392.348-396.455-396.473-396.491-396.517-398.898-398.818-398.818-716.545-718.529-720.4790.0-727.624-730.857-737.319-457.368
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-41.3-35.3-38.8-40.2-40.7-41.1-38.9-37.7-34.6-32.8-31.4-22.0-21.7-22.1-20.8-22.0-18.8-16.5-15.0-13.9-14.5-15.2-15.6-14.0-14.2-14.2-13.7-13.7-14.1-28.5-28.2-30.00.0-35.0-36.5-45.2-29.7
Percentage of Assets-18.8-15.9-17.5-18.8-19.2-19.5-18.4-18.5-17.2-16.1-15.4-11.0-10.4-10.5-9.7-9.3-8.3-7.1-6.5-5.8-5.9-6.1-6.4-5.8-5.8-5.9-5.5-5.3-6.7-12.1-12.1-12.40.0-13.0-14.20.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value0.6480.6480.6480.6460.6460.6460.6460.6450.6450.6450.6450.6440.6440.6440.6440.6410.6410.6410.6410.640.6390.6390.6380.6360.6360.6350.6350.6490.6470.6460.6450.6410.640.6390.6370.6360.6360.6360.6360.6360.6360.6350.6330.629
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value121012021207120011911183118111751167116011601156114911421141114711411135113211321125111511101104109910881083107510581092108510601050104510371033103310311026102310191010998972
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 Assets11.311.913.013.914.114.214.314.814.914.815.114.815.316.416.716.517.116.917.616.717.017.417.916.116.116.214.814.217.718.518.318.118.317.617.817.917.317.117.217.017.317.317.919.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value57835134475846244576455344194349425041093958373033763057287426062490237322102224210119931965225022232225222723002237219221792149211621112087204920582035201120031982190518211745
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 Assets54.150.751.453.754.054.653.454.854.152.351.447.845.043.941.937.537.335.434.432.831.731.231.732.932.633.030.530.437.437.136.736.636.935.435.935.534.533.733.633.433.632.732.634.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value325.6671.9020.0950.2160.03-0.0070.0390.0780.130.301-0.042-0.105
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.10.00.00.00.0-0.00.00.00.00.0-0.0-0.0

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
Value20061614162316231623162415251469135412611184854779730665650551475416392392392396396396396398398398716718718718719720720720721722725725725727730
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 Assets18.815.917.518.819.219.518.418.517.216.115.411.010.410.59.79.38.37.16.55.85.96.16.45.85.85.95.55.36.712.112.112.212.512.112.412.512.111.912.112.112.312.513.014.2

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
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-166.176-157.209-155.552-157.798-157.742-158.601-154.593-155.9-156.139-158.583-159.082-158.931-158.462-158.582-156.506-154.944-152.698-151.712-149.561-140.555-137.571-136.043-134.616-130.451-128.685-121.324-117.488-66.435-62.867-56.299-51.468-44.703-38.262-32.543-27.623-23.971-17.213-13.663-16.041-18.902-18.705-17.291-16.03514
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-1.6-1.6-1.7-1.8-1.9-1.9-1.9-2.0-2.0-2.0-2.1-2.0-2.1-2.3-2.3-2.2-2.3-2.3-2.3-2.1-2.1-2.1-2.2-1.9-1.9-1.8-1.6-0.9-1.1-1.0-0.9-0.8-0.7-0.5-0.5-0.4-0.3-0.2-0.3-0.3-0.3-0.3-0.30.3

Minority Interest Decrease From Distributions To Noncontrolling Interest Holders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders


Minority
Period End2021-06-302021-03-312020-06-302020-03-312019-09-302018-12-312018-09-302018-06-302016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value189.9052.417.5041.321-0.0010.00.0030.00.0020.0080.0060.0161.1360.0290.0380.0520.6140.0390.0450.0450.0480.3010.0410.030.0420.0380.0590.002
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Minority
Period End2021-06-302021-03-312020-06-302020-03-312019-09-302018-12-312018-09-302018-06-302016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value189.9052.417.5041.321-0.0010.00.0030.00.0020.0080.0060.0161.1360.0290.0380.0520.6140.0390.0450.0450.0480.3010.0410.030.0420.0380.0590.002
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value587262137151486211409444361181491420326177192225812401653.9371972
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.27.45.36.523.28.217.417.613.16.516.913.110.66.88.29.23.410.28.30.21.24.9

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value-275.347-309.473-343.224-316.734-159.265-174.036-349.169-110.455-24.638-92.424-171.251-132.681-500.955-90.377-36.227-47.232-40.887-14.759-32.834-19.836-39.983-30.18
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-6.2-8.7-13.2-13.6-7.6-6.8-14.9-4.4-0.9-3.3-5.9-4.1-16.2-3.5-1.6-1.9-1.7-0.6-1.6-1.0-2.5-2.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value-443.309-76.17306-64.276-65.387-183.658175-160.986-155.304-126.304-375.526-124.044-90.075-131.222-229.08914-98.104-100.347-16.282-9.804-13.281173
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-10.0-2.211.8-2.8-3.1-7.17.5-6.4-5.6-4.5-12.9-3.9-2.9-5.0-9.80.6-4.1-4.2-0.8-0.5-0.811.6

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-131.426-123.452101-229.22261-146.413235172181-37.175-55.716163-264.997-43.664-73.19192-57.981
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.0-3.53.9-9.812.5-5.710.06.86.6-1.3-1.95.1-8.6-1.7-3.17.9-2.4

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-12-312014-09-302013-12-312013-09-302011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1410145.92713111112132311-13.371-3.417-4.8939.8611.3377.1189.02812242.735108.468
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value87868581788080798080808179767475737573747473737474728165585758585657555855555555565455575556
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

us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, stld:MetalsRecyclingOperations


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1413131212111111111111111111
Percentage of DepreciationDepletionAndAmortization16.216.016.015.115.514.914.714.814.214.314.214.114.615.2

us-gaap:OperatingSegments, stld:SteelFabricationOperations


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.4062.6752.72.6342.7372.7482.8862.9412.9742.9672.7682.9412.9462.898
Percentage of DepreciationDepletionAndAmortization2.83.13.23.23.53.43.63.73.73.73.43.63.73.8

us-gaap:OperatingSegments, stld:SteelOperations


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6666646360626263636263646159
Percentage of DepreciationDepletionAndAmortization76.076.176.377.777.177.877.979.578.078.079.278.778.177.7

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.4314.1963.8293.2123.1283.1123.11.593.2623.2562.6122.8632.8522.538
Percentage of DepreciationDepletionAndAmortization5.14.84.53.94.03.93.82.04.04.13.23.53.63.3

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value63360600.6456951-32.2781.111-58.4843.206-62.464-14.8834866-37.18944-45.445133-10.699-49.17153112-100.017-62.75762-127.053-104.2579.69135.041-12.27859-46.3738-13.5786.92-60.83734-35.999-4.3752.7594-11.895-12.446-22.707118
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2043945358-154.352154-142.61-85.633-70.62461-184.43448163118-54.179363.746153-43.193-29.38410375-189.006-36.36147-133.084-155.5-30.9559988-52.273-0.25419110-70.373-2.69-73.73460-93.077-33.533-34.536261-31.98126-21.423223
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value26437423438-77.521-44.505-77.977-35.479-64.941-39.4695.305699080316757861376108-82.567-170.5938.763-161.174-164.999-47.642-27.212-11.231711823-1.66-32.348-7.143-43.005-18.7875540-36.3469.02672105-9.71511748
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value587262137151486211409444361181491420326177192225812401653.9371972
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.27.45.36.523.28.217.417.613.16.516.913.110.66.88.29.23.410.28.30.21.24.9

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value712438196104781901231521962042693973622253031511521983.83215414061-256.316582526-96.04687663347512341556.10539412539951044.058154663
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.012.47.64.53.87.45.36.07.17.39.312.411.88.713.06.26.48.40.27.57.13.6-16.13.11.31.3-3.83.93.31.92.62.81.32.43.20.42.12.21.42.04.85.40.31.03.04.2

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value9.9128.2484.1343.2693.4961.562.4440.499-0.152-0.4690.123-6.225-3.807-3.516-5.962-4.881-6.396-5.685-6.963-6.728-5.167-3.898-4.424-3.447
Percentage of ProfitLoss1.41.94.04.21.81.01.20.2-0.1-0.10.0-24.6-14.1-4.0-9.0-14.5-12.5-24.4-16.9-110.2-13.1-9.3-17.2-8.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.20.20.10.10.10.0-0.0-0.00.0-0.3-0.2-0.2-0.3-0.3-0.3-0.3-0.4-0.4-0.3-0.2-0.2-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value7024301007518715119420427039836231309172385728481244453043
Percentage of ProfitLoss98.698.196.095.898.299.098.899.8100.1100.1100.0124.6114.1104.0109.0114.5112.5124.4116.9210.2113.1109.3117.2108.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.812.24.33.67.36.07.07.39.312.411.81.61.54.03.62.23.11.72.80.82.42.41.62.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value9.80817189.4869.5217148.8419.0815147.9788.04112116.8756.3811105.9247.2368.4052.3725.3326.3578.543-1.5565.1044.75.7685.8922.5152.3444.7533.0180.7382.6026.1235.9283.8333.8123.714.9643.6263.3292.769
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value-275.347-309.473-343.224-316.734-159.265-174.036-349.169-110.455-24.638-92.424-171.251-132.681-500.955-90.377-36.227-47.232-40.887-14.759-32.834-19.836-39.983-30.18
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-6.2-8.7-13.2-13.6-7.6-6.8-14.9-4.4-0.9-3.3-5.9-4.1-16.2-3.5-1.6-1.9-1.7-0.6-1.6-1.0-2.5-2.0

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


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
Value2773093433273092171581548554627055503742434174593527283022332824332440524945645854457538341837244030
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, stld:MetalsRecyclingOperations


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7.324235.1575.6743.821181611126.6428.022118.9476.946
Percentage of PaymentsToAcquirePropertyPlantAndEquipment2.67.71.51.71.28.410.57.514.312.212.816.416.213.7

us-gaap:OperatingSegments, stld:SteelFabricationOperations


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.0772.6213.6685.1132.3644.0893.6753.7593.0191.9932.7771.3952.0542.077
Percentage of PaymentsToAcquirePropertyPlantAndEquipment1.10.81.11.60.81.92.32.43.53.74.42.03.74.1

us-gaap:OperatingSegments, stld:SteelOperations


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value25728232830930119325640434351574238
Percentage of PaymentsToAcquirePropertyPlantAndEquipment92.891.295.794.497.288.8162.426.551.280.282.280.876.175.9

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9.5550.7265.9077.4392.3521.95-119.05298262.1250.390.5962.1943.181
Percentage of PaymentsToAcquirePropertyPlantAndEquipment3.40.21.72.30.80.9-75.263.631.03.90.60.84.06.3

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value-443.309-76.17306-64.276-65.387-183.658175-160.986-155.304-126.304-375.526-124.044-90.075-131.222-229.08914-98.104-100.347-16.282-9.804-13.281173
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-10.0-2.211.8-2.8-3.1-7.17.5-6.4-5.6-4.5-12.9-3.9-2.9-5.0-9.80.6-4.1-4.2-0.8-0.5-0.811.6

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
Value54525252525151525342434444363637373434343433333333272727252424242421212121212121211616161616
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 End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3930.00.00.010656114938433074496915997661
Percentage of PaymentsForRepurchaseOfCommonStock100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312011-12-312010-12-31
Value536484435305448400506558520
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value5938444175114604143
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value12101016191517262264494947
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value0.805212120332621104.773
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0

stld:DeferredIncomeTaxNoncashExpenseBenefit

stld:DeferredIncomeTaxNoncashExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-06-302020-03-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value5066145.927121623119.545-153.7483.2846.8497.716-0.033181817-145.537131616-17.254-3.417-0.28-4.091-0.8719.86110100.06434109.1975.3557.1189.02812
Percentage of DeferredIncomeTaxNoncashExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stld:ExpensesRecordedRelatedToCallAndEarlyPayoff us-gaap:StatementScenario

stld:ExpensesRecordedRelatedToCallAndEarlyPayoff

srt:ScenarioForecast


Expenses
Period End2020-12-31
Value10
Percentage of ExpensesRecordedRelatedToCallAndEarlyPayoff100.0

stld:SegmentRevenuesFromExternalCustomersNetPercentage us-gaap:StatementBusinessSegments

stld:SegmentRevenuesFromExternalCustomersNetPercentage

stld:MetalsRecyclingOperations


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value13.013.01.012.00.070.11-0.010.110.120.13-0.010.120.140.1500.140.140.1500.150.150.1500.180.20.21-0.020.26
Percentage of SegmentRevenuesFromExternalCustomersNetPercentage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0

stld:SteelFabricationOperations


Segment
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
Value7.07.0-1.010.00.10.0900.10.090.0800.080.070.080.010.090.080.0800.080.080.10.010.090.080.0800.080.070.0600.060.060.05
Percentage of SegmentRevenuesFromExternalCustomersNetPercentage53.853.8-100.083.3142.981.8-0.090.975.061.5-0.066.750.053.30.064.357.153.30.053.353.366.70.050.040.038.1-0.030.80.00.00.00.00.00.0

stld:SteelOperations


Segment
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
Value72.071.0-1.073.00.780.7500.760.760.7500.770.750.74-0.010.730.730.7300.740.720.700.690.690.680.020.620.610.610.010.610.610.59
Percentage of SegmentRevenuesFromExternalCustomersNetPercentage553.8546.2-100.0608.31114.3681.8-0.0690.9633.3576.9-0.0641.7535.7493.30.0521.4521.4486.70.0493.3480.0466.70.0383.3345.0323.8-100.0238.50.00.00.00.00.00.0

stld:TransfersOfNonControllingInterestToRedeemableNonControllingInterestAndDecreaseFromDistributionsToNoncontrollingInterestHolders

stld:TransfersOfNonControllingInterestToRedeemableNonControllingInterestAndDecreaseFromDistributionsToNoncontrollingInterestHolders


Transfers
Period End2020-09-302020-06-302020-03-312019-09-30
Value4190000.02410000.07504000.01321000.0
Percentage of TransfersOfNonControllingInterestToRedeemableNonControllingInterestAndDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0

stld:TransfersOfNonControllingInterestToRedeemableNonControllingInterestAndDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap:StatementEquityComponents

stld:RedeemableNoncontrollingInterest


Transfers
Period End2020-09-302020-06-302020-03-312019-09-30
Value-3000000.0-1400000.0-7400000.0-3684000.0
Percentage of TransfersOfNonControllingInterestToRedeemableNonControllingInterestAndDecreaseFromDistributionsToNoncontrollingInterestHolders-71.6-58.1-98.6-278.9

us-gaap:NoncontrollingInterest


Transfers
Period End2020-09-302020-06-302020-03-312019-09-30
Value4190000.02410000.07504000.01321000.0
Percentage of TransfersOfNonControllingInterestToRedeemableNonControllingInterestAndDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0

us-gaap:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred

stld:ZimmerS.a.DeC.v.


Business
Period End2020-12-31
Value1.0
Percentage of BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred100.0

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1

us-gaap:CommodityContract, stld:HedgedItemsFirmCommitment, us-gaap:Future, us-gaap:DesignatedAsHedgingInstrument, us-gaap:CostOfSales


Change
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-2319000.0-1898000.0822000.0-2156000.0-484000.01739000.0-1010000.0-519000.01415000.0-1499000.0-1136000.05111000.0-2600000.0-793000.0
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommodityContract, stld:HedgedItemsInventory, us-gaap:Future, us-gaap:DesignatedAsHedgingInstrument, us-gaap:CostOfSales


Change
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-1707000.0-498000.0-140000.0-1682000.02579000.0-1239000.0587000.0-182000.0-294000.0721000.0-1120000.01753000.0-816000.0-2596000.0
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge173.626.2-17.078.0-532.9-71.2-58.135.1-20.8-48.198.634.331.4327.4

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 us-gaap:DerivativeInstrumentRisk, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:CommodityContract, us-gaap:Future, us-gaap:DesignatedAsHedgingInstrument, us-gaap:CostOfSales


Change
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-4026000.0-2396000.0-3838000.02095000.0500000.0-701000.01121000.0-778000.0-1136000.05111000.0-2600000.0-3389000.0819000.0-1711000.02167000.0
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1173.6126.2178.0-432.928.8135.179.251.9100.0100.0100.0427.40.00.00.0

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStockDividendsPerShareDeclared


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.260.260.250.250.250.250.240.240.240.240.18750.18750.18750.18750.1550.1550.1550.1550.140.140.140.140.13750.13750.13750.13750.1150.1150.1150.1150.110.110.110.110.10.10.10.10.10.10.10.10.0750.0750.0750.075
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentRedemptionPricePercentage us-gaap:DebtInstrument

us-gaap:DebtInstrumentRedemptionPricePercentage

stld:SeniorNotes4.125PercentDue2025


Debt
Period End2020-10-31
Value102.06
Percentage of DebtInstrumentRedemptionPricePercentage100.0

us-gaap:DerivativeExcludedComponentGainLossRecognizedInEarnings

us-gaap:DerivativeExcludedComponentGainLossRecognizedInEarnings


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1600000.021000.017000.0110000.02400.0-61000.0-129000.069000.01200000.0-1100000.095500.05000.0-117000.0
Percentage of DerivativeExcludedComponentGainLossRecognizedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeNonmonetaryNotionalAmountMass us-gaap:ProductOrService, us-gaap:FinancialInstrument, us-gaap:Position

us-gaap:DerivativeNonmonetaryNotionalAmountMass

stld:AluminumCommodity, us-gaap:Future, us-gaap:Long


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-175.03475.0-725.0-1675.02100.01425.0-75.0-1875.0-625.03075.0
Percentage of DerivativeNonmonetaryNotionalAmountMass100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stld:AluminumCommodity, us-gaap:Future, us-gaap:Short


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-1700.07025.0-575.0-1025.004475.0-1475.0-400.0-1425.05925.0
Percentage of DerivativeNonmonetaryNotionalAmountMass971.4202.279.361.20.0314.01966.721.3228.0192.7

stld:CopperCommodity, us-gaap:Future, us-gaap:Long


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value18710.08301.01202.0-6622.02687.08766.0-5557.0-7722.05318.012440.0
Percentage of DerivativeNonmonetaryNotionalAmountMass-10691.4238.9-165.8395.3128.0615.27409.3411.8-850.9404.6

stld:CopperCommodity, us-gaap:Future, us-gaap:Short


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value19890.022725.09083.0-3209.05931.013562.0-5284.0-6419.05364.022759.0
Percentage of DerivativeNonmonetaryNotionalAmountMass-11365.7654.0-1252.8191.6282.4951.77045.3342.3-858.2740.1

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value5354525252515253424344443636373734343434333333332727272524242424212121212121
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value5354525252515253424344443636373734343434333333332727272524242424212121212121
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet

us-gaap:GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-3.45.4-2.402-0.403-1.21.4-0.682-0.3991.7-2.21.5-2.1-1.85.0-2.6381.1-0.266-0.599-0.1830.006-0.678-1.22.3
Percentage of GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnPriceRiskDerivativesNet us-gaap:DerivativeInstrumentRisk, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:GainLossOnPriceRiskDerivativesNet

us-gaap:CommodityContract, us-gaap:Future, us-gaap:DesignatedAsHedgingInstrument, us-gaap:CostOfSales


Gain
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
Value2.1847.786-3.13.545-3.2870.838-0.2410.3020.591-1.4533.807-8.9431.548.5165.1924.122-3.398
Percentage of GainLossOnPriceRiskDerivativesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommodityContract, us-gaap:Future, us-gaap:Nondesignated, us-gaap:CostOfSales


Gain
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
Value-15.584-30.195-16.729-10.289-1.28910-5.2424.5365.487-4.0770.307132.9692.756-6.256-10.5662.384
Percentage of GainLossOnPriceRiskDerivativesNet-713.6-387.8539.6-290.239.21305.42175.11502.0928.4280.68.1-154.3192.832.4-120.5-256.3-70.2

us-gaap:GoodwillPeriodIncreaseDecrease us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:GoodwillPeriodIncreaseDecrease

stld:MetalsRecyclingOperations, stld:OmniSource


Goodwill
Period End2021-06-302021-03-312020-12-31
Value-852000.0-848000.0-900000.0
Percentage of GoodwillPeriodIncreaseDecrease100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value111-3.5742755-20.884-76.1948.6786415-163.339197947-76.751-2.0376220-44.2475.8154529-6.247-12.716308.59-87.117382323-48.32308.82519-43.64219-61.929-12.59-29.856-9.55350-12.52119-17.03833-29.7355
Percentage of IncreaseDecreaseInAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable

us-gaap:IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2759-0.7-27.1277.99352-31.816.293-36.42849-28.943-31.1272263-39.692-12.929-77.58796-54.881-7.4213413-16.60319-6.84416-44.5778.062-4.96419-2.52216-23.304-3.0224.72725-26.468173.833-5.911-17.11945-7.1028.82960
Percentage of IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4.285-5.8287.2493.894-11.1371.541-6.103-0.039-7.292-0.301-3.6896.4290.630.105-5.8919.234-5.418-2.1130.0-0.694-10.613-0.7465.513.1-7.386-4.508-0.2884.928-0.345-7.359-5.2911.727-6.783-3.358-3.587.4840.393-2.9631.646-1.632-2.315-3.3824.3372.4099.529-0.94
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1599000.01239000.083000.01560000.01035000.0770000.057000.01236000.01014000.0904000.0-19000.01441000.01328000.01100000.0-50000.01814000.01678000.01603000.034000.01921000.01737000.01406000.01748000.01591000.01332000.0-24000.02157000.01789000.01608000.029000.01366000.01265000.01460000.08000.0853000.0722000.01148000.0-173000.0703000.01384000.01850000.0-44000.01280000.01583000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncontrollingInterestIncreaseFromBusinessCombination us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterestIncreaseFromBusinessCombination

stld:RedeemableNoncontrollingInterest


Noncontrolling
Period End2021-06-302021-03-312020-06-302020-03-312019-09-302019-03-31
Value125.01.47.43.68428
Percentage of NoncontrollingInterestIncreaseFromBusinessCombination100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax


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
Value263.7651.807-0.1210.1860.037-0.046-0.039-0.052-0.1710.3430.063-0.105
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value263.765-0.1210.1860.037-0.039-0.052-0.1710.063-0.105
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value349.32.583-0.2740.480.011-0.002-0.0080.0880.0580.5990.082-0.138
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax


Other
Period End2021-06-302020-06-30
Value8332000.058000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2800000.04400000.0181000.0-115000.0236000.0-37000.01024000.0-43000.0157000.0283000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherLaborRelatedExpenses

us-gaap:OtherLaborRelatedExpenses


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
Value824819119.092211317222341454226212121271922209.2914.4279.0085.0314.5981312105.3957.8738.4694.7796.6436.753.9548.2118.0726.0647.42814153.6434.5627.8279.444
Percentage of OtherLaborRelatedExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherLaborRelatedExpenses us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value794818108.2211217212340434025
Percentage of OtherLaborRelatedExpenses96.298.594.389.190.299.390.295.293.197.196.495.895.996.0

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:OtherOperatingActivitiesCashFlowStatement


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-1.472-0.6629.273174.728-0.2642.365-1.116-0.5640.728-1.4420.312-0.1450.036.0138.202-0.043-0.104190.1611.0350.18
Percentage of OtherOperatingActivitiesCashFlowStatement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingIncomeExpenseNet us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OtherOperatingIncomeExpenseNet

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-7600000.0-1800000.0-5000000.0-100000.0300000.0300000.0-800000.0-1300000.0-1500000.0-2300000.0-1300000.0-2100000.00-5600000.0
Percentage of OtherOperatingIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:OtherSellingGeneralAndAdministrativeExpense

us-gaap:OtherSellingGeneralAndAdministrativeExpense


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
Value15414913711810911211110710611110610210110696979810294959687868282769280737074676565696261646172636559545557
Percentage of OtherSellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherSellingGeneralAndAdministrativeExpense us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1818121414171015182214131415
Percentage of OtherSellingGeneralAndAdministrativeExpense11.812.08.812.013.315.29.014.416.920.413.113.414.414.8

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


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
Value-1.859-0.39-0.933-0.38-0.803-0.518-1.733-2.746-0.913-0.364-5.445-0.576-0.657-0.229-1.636-1.081-2.387-26.918-2.851-1.507-1.206-3.054-3.69-3.715-0.806-1.6630.19-2.959-2.314-28.8841.643-0.844-0.863-33.9341.007-0.655-0.6781.864-14.054-0.947-2.1421.14318-0.936-0.977-0.504
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesGross

us-gaap:PaymentsToAcquireBusinessesGross


Payments
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302014-12-312014-09-30
Value1.0590.03.6940.0930.0373960.6745.518141090.045211647
Percentage of PaymentsToAcquireBusinessesGross100.0100.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesGross us-gaap:BusinessAcquisition

stld:ZimmerS.a.DeC.v.


Payments
Period End2020-08-03
Value59
Percentage of PaymentsToAcquireBusinessesGross0.0

us-gaap:PaymentsToAcquireShortTermInvestments

us-gaap:PaymentsToAcquireShortTermInvestments


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.00.0149262344949143355040
Percentage of PaymentsToAcquireShortTermInvestments0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfDebt

us-gaap:ProceedsFromIssuanceOfDebt


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value41929791129510992161199128125121117110124931184505137612632028676050320139463435.1469.5260.0324090.07600.0289-5.874100.05.126-15.427252.002
Percentage of ProceedsFromIssuanceOfDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-12-312013-09-302012-12-312012-09-302012-06-30
Value0.06914919269791091043010.00.00.0-31.529.99854
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments0.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302013-03-31
Value-6.094-16.598-20.598-1.587-8.763-6.152-20.302-1.527-0.012-5.72-10.1770.0-3.144-5.18-17.291-4.8320.0-3.532-19.0821.0053.680.75-9.366-0.017-19.924
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfDebt

us-gaap:RepaymentsOfDebt


Repayments
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
Value4083043051103235119133115115118113294341.4299.999814.232736042713876564.097202305946212830.1050.4917.3250.1464.476
Percentage of RepaymentsOfDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromRelatedParties

us-gaap:RevenueFromRelatedParties


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
Value116.9725.2863.6081.3413.5563.1933.5664.1512.9494.3082.6566.7036.5633844434841404443354959436562826479736567576879766167757451636259
Percentage of RevenueFromRelatedParties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value8.9324.2738.5038.6339.4297.878.0166.6953.3857.0817.1435.132-6.06.3415.826.125
Percentage of StockGrantedDuringPeriodValueSharebasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value7.888-4.4478.6147.8382.7648.0077.3660.0913.4927.1896.4961.337-5.9296.4135.1583.143
Percentage of StockGrantedDuringPeriodValueSharebasedCompensation88.3-104.1101.390.829.3101.791.91.4103.2101.590.926.198.8101.188.651.3

us-gaap:RetainedEarnings


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-0.125-0.161-0.161-0.158-0.169-0.166-0.166-0.11-0.107-0.109-0.11-0.071-0.075-0.072-0.098-0.031
Percentage of StockGrantedDuringPeriodValueSharebasedCompensation-1.4-3.8-1.9-1.8-1.8-2.1-2.1-1.6-3.2-1.5-1.5-1.41.2-1.1-1.7-0.5

us-gaap:TreasuryStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.1698.8810.050.9536.8340.0290.8166.714-0.0010.0010.7573.8660.0010.00.763.013
Percentage of StockGrantedDuringPeriodValueSharebasedCompensation13.1207.80.611.072.50.410.2100.3-0.00.010.675.3-0.00.013.149.2

us-gaap:SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions us-gaap:ConsolidatedEntities

us-gaap:SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions

stld:MesabiNugget


Subsidiary
Period End2021-06-302021-03-31
Value084.0
Percentage of SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions0.0100.0

stld:UnitedSteelSupplyLlc


Subsidiary
Period End2021-06-302021-03-31
Value075.0
Percentage of SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions0.089.3

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:TreasuryStockValueAcquiredCostMethod


Treasury
Period End2021-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value393106114938433074496915997661
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:StatementEquityComponents

us-gaap:TreasuryStock


Treasury
Period End2021-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value393106114938433074496915997661
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stld:AccountsReceivableNetCurrentIncludingRelatedPartyReceivables us-gaap:ConsolidatedEntities

stld:AccountsReceivableNetCurrentIncludingRelatedPartyReceivables

us-gaap:IntersegmentElimination


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-31
Value-53.0-76.4-61.2-49.1-54.7-61.2-57.2-59.5-64.6
Percentage of AccountsReceivableNetCurrentIncludingRelatedPartyReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0

stld:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsNetOfCashAcquired us-gaap:BusinessAcquisition

stld:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsNetOfCashAcquired

stld:ZimmerS.a.DeC.v.


Business
Period End2020-08-03
Value31
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsNetOfCashAcquired100.0

stld:CreditFacilityAmountByWhichFacilityCanBeIncreased us-gaap:CreditFacility

stld:CreditFacilityAmountByWhichFacilityCanBeIncreased

us-gaap:LineOfCredit


Credit
Period End2020-12-312014-12-31
Value500750
Percentage of CreditFacilityAmountByWhichFacilityCanBeIncreased100.0100.0

stld:IntraCompanyDebt us-gaap:ConsolidatedEntities

stld:IntraCompanyDebt

us-gaap:IntersegmentElimination


Intra
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-15.9-11.7-9.1-7.2-6.5-8.1-8.1-8.7-8.310-14.0
Percentage of IntraCompanyDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stld:IntraCompanyDebt us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Intra
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value15119.17.26.58.18.18.78.31014
Percentage of IntraCompanyDebt-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0100.0-100.0

stld:OutstandingLettersOfCreditAndOtherObligations us-gaap:CreditFacility

stld:OutstandingLettersOfCreditAndOtherObligations

us-gaap:LineOfCredit


Outstanding
Period End2020-12-31
Value11
Percentage of OutstandingLettersOfCreditAndOtherObligations100.0

us-gaap:AccountsPayableRelatedPartiesCurrent

us-gaap:AccountsPayableRelatedPartiesCurrent


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
Value16218.919125.0879.2853.6579.729.0479.18314151818151616161310106.176.637.7768.3359.6952118171510158.6529.2251512119.7656.5849.1071215136.765
Percentage of AccountsPayableRelatedPartiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsReceivableNet

us-gaap:AccountsReceivableNet


Accounts
Period End2020-09-302020-06-302020-03-31
Value918844998
Percentage of AccountsReceivableNet100.0100.0100.0

us-gaap:AccountsReceivableNet us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value42521712118.6175.9
Percentage of AccountsReceivableNet0.00.00.01.31.40.90.00.0

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivable


Allowance
Period End2020-09-30
Value8300000.0
Percentage of AllowanceForDoubtfulAccountsReceivable100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
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
Value8.48.28.209151715149.765121111181920
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsHeldForSaleNotPartOfDisposalGroup us-gaap:BalanceSheetLocation

us-gaap:AssetsHeldForSaleNotPartOfDisposalGroup

us-gaap:OtherCurrentAssets


Assets
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value7.28.08.38.7298.6
Percentage of AssetsHeldForSaleNotPartOfDisposalGroup100.0100.0100.0100.0100.0100.0

us-gaap:BusinessAcquisitionPercentageOfVotingInterestsAcquired us-gaap:BusinessAcquisition

us-gaap:BusinessAcquisitionPercentageOfVotingInterestsAcquired

stld:ZimmerS.a.DeC.v.


Business
Period End2020-08-03
Value100.0
Percentage of BusinessAcquisitionPercentageOfVotingInterestsAcquired100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets

stld:ZimmerS.a.DeC.v.


Business
Period End2020-08-03
Value30
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill

stld:ZimmerS.a.DeC.v.


Business
Period End2020-08-03
Value25
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities

stld:ZimmerS.a.DeC.v.


Business
Period End2020-08-03
Value13
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment

stld:ZimmerS.a.DeC.v.


Business
Period End2020-08-03
Value18
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment100.0

us-gaap:DebtInstrumentCarryingAmount

us-gaap:DebtInstrumentCarryingAmount


Debt
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value3158276424012408238626283024
Percentage of DebtInstrumentCarryingAmount100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType

stld:MesabiNugget, us-gaap:SecuredDebt


Debt
Period End2020-12-312019-12-31
Value1517
Percentage of DebtInstrumentCarryingAmount0.50.6

stld:TwoSubsidiaries, us-gaap:SecuredDebt


Debt
Period End2020-12-312019-12-31
Value9.610
Percentage of DebtInstrumentCarryingAmount0.30.4

us-gaap:DebtInstrumentCarryingAmount us-gaap:DebtInstrument

stld:OtherDebt


Debt
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value10811451583640
Percentage of DebtInstrumentCarryingAmount3.44.12.12.41.51.5

stld:SeniorNotes1.65PercentDue2027


Debt
Period End2020-12-31
Value350
Percentage of DebtInstrumentCarryingAmount11.1

stld:SeniorNotes2.40PercentDue2025


Debt
Period End2020-12-31
Value400
Percentage of DebtInstrumentCarryingAmount12.7

stld:SeniorNotes3.25PercentDue2031


Debt
Period End2020-12-31
Value500
Percentage of DebtInstrumentCarryingAmount15.8

stld:SeniorNotes3.25PercentDue2050


Debt
Period End2020-12-31
Value400
Percentage of DebtInstrumentCarryingAmount12.7

us-gaap:DebtInstrumentCarryingAmount us-gaap:LongtermDebtType

us-gaap:UnsecuredDebt


Debt
Period End2020-12-312019-12-31
Value1.22.0
Percentage of DebtInstrumentCarryingAmount0.00.1

us-gaap:DebtInstrumentFaceAmount us-gaap:DebtInstrument

us-gaap:DebtInstrumentFaceAmount

stld:Senior1.650PercentNotesDue2027


Debt
Period End2020-10-31
Value350
Percentage of DebtInstrumentFaceAmount100.0

stld:Senior3.250PercentNotesDue2050


Debt
Period End2020-10-31
Value400
Percentage of DebtInstrumentFaceAmount114.3

stld:SeniorNotes1.65PercentDue2027


Debt
Period End2020-10-31
Value350
Percentage of DebtInstrumentFaceAmount100.0

stld:SeniorNotes3.25PercentDue2050


Debt
Period End2020-10-31
Value400
Percentage of DebtInstrumentFaceAmount114.3

us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredFinanceCostsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value55302426293342
Percentage of DeferredFinanceCostsNet100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value596523480347523515567579556508
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


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
Value606066621081418252439383
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsInventory

us-gaap:DeferredTaxAssetsInventory


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value5.675.5999.5994.1091121203.6219.6439.287
Percentage of DeferredTaxAssetsInventory100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value252730334861331815
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value7.0778.027.6398.0748.4918.6845.5716.238103.15
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value22191916242122232231
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value5133221.29210894797969
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


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
Value5.6512.1461.7341.633.9523.4888.35910116.6662.603
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value538487455344519511449474465471448
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssets us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:FinancialInstrument

us-gaap:DerivativeAssets

us-gaap:OtherCurrentAssets, us-gaap:CommodityContract, us-gaap:Future


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value4915133.53.12.63.74.34.83.74.93.54.43.55.66.02.43.2
Percentage of DerivativeAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeAsset

us-gaap:DerivativeFairValueOfDerivativeAsset


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value65196.7972.9615.565.3941.2761.3765.4252.0324.5580.9899.0937.1512.794.1491.9332.5824.060.6221.7650.9823.621.010.6983.4615.7134.024
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OtherCurrentAssets, us-gaap:CommodityContract, us-gaap:Future, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value57175.0922.0122.063.2830.9661.0631.4790.5522.9990.4186.5944.9181.2112.5760.5972.91
Percentage of DerivativeFairValueOfDerivativeAsset87.485.174.968.037.160.975.777.327.327.265.842.372.568.843.462.130.971.7

us-gaap:OtherCurrentAssets, us-gaap:CommodityContract, us-gaap:Future, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value8.2512.9671.7050.9493.52.1110.310.3133.9461.481.5590.5712.4992.2331.5791.5731.3361.15
Percentage of DerivativeFairValueOfDerivativeAsset12.614.925.132.062.939.124.322.772.772.834.257.727.531.256.637.969.128.3

us-gaap:DerivativeFairValueOfDerivativeAsset us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:CommodityContract, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:Future


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value65196.7972.9615.565.3941.2761.3765.4252.0324.5580.9899.0937.1512.794.1491.9334.06
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeAsset us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:CommodityContract, us-gaap:FairValueMeasurementsRecurring, us-gaap:Future


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value65196.7972.9615.565.3941.2761.3765.4252.0324.5580.9899.0937.1512.794.1491.9334.06
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiability

us-gaap:DerivativeFairValueOfDerivativeLiability


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value165.5057.4421.4946.8485.0391.7323.9055.6452.823.894.7222.6971.407100.8934.441.0142.0832.1933.925
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OtherCurrentAssets, us-gaap:CommodityContract, us-gaap:Future, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value103.8254.6350.8274.262.4411.0110.8051.4731.0681.8373.5880.8290.5555.3640.3962.5381.3
Percentage of DerivativeFairValueOfDerivativeLiability61.969.562.355.462.248.458.420.626.137.947.276.030.739.451.144.357.262.4

us-gaap:OtherCurrentAssets, us-gaap:CommodityContract, us-gaap:Future, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value6.4651.682.8070.6672.5882.5980.7213.14.1721.7522.0531.1341.8680.8525.1420.4971.9020.783
Percentage of DerivativeFairValueOfDerivativeLiability38.130.537.744.637.851.641.679.473.962.152.824.069.360.648.955.742.837.6

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:CommodityContract, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:Future


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value165.5057.4421.4946.8485.0391.7323.9055.6452.823.894.7222.6971.407100.8934.442.083
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:CommodityContract, us-gaap:FairValueMeasurementsRecurring, us-gaap:Future


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value165.5057.4421.4946.8485.0391.7323.9055.6452.823.894.7222.6971.407100.8934.442.083
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DueFromRelatedPartiesCurrent

us-gaap:DueFromRelatedPartiesCurrent


Due
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
Value5.7075.9283.9373.6192.4633.0842.9583.4313.8182.3573.5363.7134.3884.198222520222627353534414428424558505650484942565551425151553830
Percentage of DueFromRelatedPartiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DueFromRelatedPartiesCurrent us-gaap:RelatedPartyTransactionsByRelatedParty

stld:OtherSmallerAffiliatedEntities


Due
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
Value3.9372.9583.5363.0685.4833.6457.5434.6324.7717.2476.5773.573
Percentage of DueFromRelatedPartiesCurrent100.0100.0100.013.720.910.617.58.211.116.917.311.7

us-gaap:DueToRelatedPartiesCurrent us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DueToRelatedPartiesCurrent

stld:OtherSmallerAffiliatedEntities


Due
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
Value8.9193.6571415126.199219.936145.702126.297
Percentage of DueToRelatedPartiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-312009-12-31
Value276182201177148124208181148114264228170113195171138106164143112819495786612810774579379655985686243
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:RestrictedStockUnitsRSU


Employee
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value3533313229272522
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value35132229426929426524121521518114298
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive


Finite
Period End2020-12-312019-12-312018-12-312016-12-312014-12-31
Value18820014616183
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths


Finite
Period End2020-12-312019-12-312018-12-312016-12-312014-12-31
Value2928282924
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive


Finite
Period End2020-12-312019-12-312018-12-312016-12-312014-12-31
Value2423202015
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour


Finite
Period End2020-12-312019-12-312018-12-312016-12-312014-12-31
Value2623222216
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree


Finite
Period End2020-12-312019-12-312018-12-312016-12-312014-12-31
Value2725242419
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo


Finite
Period End2020-12-312019-12-312018-12-312016-12-312014-12-31
Value2726262621
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:CustomerRelationships


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value526501435394446420
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0

us-gaap:OtherIntangibleAssets


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1.351.352.1652.1651.415
Percentage of FiniteLivedIntangibleAssetsGross0.30.30.50.50.3

us-gaap:TradeNames


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value14714712713013085
Percentage of FiniteLivedIntangibleAssetsGross28.129.529.333.129.220.2

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss

stld:MetalsRecyclingOperations, stld:OmniSource


Goodwill
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value346346346346346341
Percentage of GoodwillImpairedAccumulatedImpairmentLoss100.0100.0100.0100.0100.0100.0

us-gaap:IntangibleAssetsGrossExcludingGoodwill

us-gaap:IntangibleAssetsGrossExcludingGoodwill


Intangible
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value676650564526578544
Percentage of IntangibleAssetsGrossExcludingGoodwill100.0100.0100.0100.0100.0100.0

us-gaap:InterestPayableCurrent

us-gaap:InterestPayableCurrent


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-312010-12-312009-12-31
Value17331927113918472547254725472549295030473847384738515021302131233235363528
Percentage of InterestPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryFinishedGoodsNetOfReserves


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
Value432423389333344343349359396403416388355318340313302295272268252234242261277293350383287311276230241252246228252262232223217198
Percentage of InventoryFinishedGoodsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryRawMaterialsNetOfReserves

us-gaap:InventoryRawMaterialsNetOfReserves


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
Value13021090790628589650686758784828810855833725675677616574515490415353419559518677764766614615660583558526594623654644609578598589
Percentage of InventoryRawMaterialsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventorySuppliesNetOfReserves

us-gaap:InventorySuppliesNetOfReserves


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
Value510494500497483490498492471450436425407386374376375376383392388390396385385381374365288292293280279277278272262258251240239231
Percentage of InventorySuppliesNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryWorkInProcessNetOfReserves

us-gaap:InventoryWorkInProcessNetOfReserves


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
Value236209162149150160154156149184195184190169128119124113103124119889011411010012814813011284978911382858210610611614094
Percentage of InventoryWorkInProcessNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-31
Value20
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0

us-gaap:LineOfCredit us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType

us-gaap:LineOfCredit

stld:SubsidiaryOne, us-gaap:RevolvingCreditFacility


Line
Period End2020-12-312019-12-31
Value8264
Percentage of LineOfCredit100.0100.0

us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd

stld:SubsidiaryOne, us-gaap:RevolvingCreditFacility


Line
Period End2020-12-31
Value1.65
Percentage of LineOfCreditFacilityInterestRateAtPeriodEnd100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

stld:SubsidiaryOne, us-gaap:RevolvingCreditFacility


Line
Period End2020-12-31
Value100
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

stld:SubsidiaryTwo, us-gaap:RevolvingCreditFacility


Line
Period End2020-12-31
Value50
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity50.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:CreditFacility

us-gaap:LineOfCredit


Line
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-11-302014-10-31
Value120012001200120012001200120012001100
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity1200.00.00.00.00.00.00.00.00.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:UnsecuredDebt


Line
Period End2020-12-31
Value3.0
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0

us-gaap:LongTermDebtFairValue us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:LongTermDebtFairValue

us-gaap:FairValueInputsLevel2


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value330032003400290028002600280025002500250024002500
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive


Long
Period End2020-12-31
Value2256
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths


Long
Period End2020-12-31
Value86
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive


Long
Period End2020-12-312014-12-312012-12-312011-12-31
Value4036033.037682
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour


Long
Period End2020-12-312015-12-31
Value403603
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree


Long
Period End2020-12-312013-12-31
Value3.799183
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo


Long
Period End2020-12-31
Value4355000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0

us-gaap:LongtermDebtWeightedAverageInterestRate us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType

us-gaap:LongtermDebtWeightedAverageInterestRate

stld:TwoSubsidiaries, us-gaap:SecuredDebt


Longterm
Period End2020-12-31
Value5.3
Percentage of LongtermDebtWeightedAverageInterestRate100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-312019-12-31
Value3.843.96
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

us-gaap:DomesticCountry


Operating
Period End2020-12-31
Value87
Percentage of OperatingLossCarryforwards100.0

us-gaap:PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months

us-gaap:PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months


Price
Period End2021-06-302021-03-312020-12-312020-09-30
Value397.42.50.124
Percentage of PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months100.0100.0100.0100.0

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount


Redeemable
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
Value176163158155152151143143139139111111111111111111111111111126126126126126125126126126124121116110104999893777370645454
Percentage of RedeemableNoncontrollingInterestEquityCarryingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount us-gaap:ConsolidatedEntities

stld:UnitedSteelSupplyLlc


Redeemable
Period End2021-06-302021-03-312020-12-31
Value655247
Percentage of RedeemableNoncontrollingInterestEquityCarryingAmount37.032.029.9

us-gaap:RestrictedCashAndCashEquivalents

us-gaap:RestrictedCashAndCashEquivalents


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value5500000.05500000.05500000.05500000.05900000.05500000.05900000.05500000.06200000.05800000.06200000.05800000.06000000.05600000.06400000.06300000.06600000.06600000.06600000.06600000.0
Percentage of RestrictedCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SecuritiesLoanedFairValueOfCollateral us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType

us-gaap:SecuritiesLoanedFairValueOfCollateral

stld:SubsidiaryOne, us-gaap:RevolvingCreditFacility


Securities
Period End2020-12-31
Value30
Percentage of SecuritiesLoanedFairValueOfCollateral100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value31.4432.5336.3234.2222.3818.5519.8514.97
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

stld:EquityIncentive2015Plan


Share
Period End2020-12-312019-12-312018-12-312015-12-31
Value6.28.73.39.1
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant100.0100.0100.0100.0

stld:ExecutiveIncentiveCompensationPlan2018


Share
Period End2020-12-312019-12-312018-12-31
Value1.51.71.8
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant24.219.554.5

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding us-gaap:AwardType

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding

us-gaap:RestrictedStockUnitsRSU


Sharebased
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value6253406072403944
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1


Stock
Period End2020-12-31
Value444
Percentage of StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1100.0

us-gaap:TreasuryStockShares us-gaap:StatementEquityComponents

us-gaap:TreasuryStockShares

us-gaap:TreasuryStock


Treasury
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value5551402720191935363636
Percentage of TreasuryStockShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued


Unrecognized
Period End2020-12-312019-12-312018-12-31
Value828000.01400000.02400000.0
Percentage of UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate


Unrecognized
Period End2020-12-312019-12-312018-12-31
Value9000000.06000000.06000000.0
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate100.0100.0100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary


Unrecorded
Period End2020-12-31
Value16
Percentage of UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary


Unrecorded
Period End2020-12-312019-12-31
Value265240
Percentage of UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary100.0100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary


Unrecorded
Period End2020-12-31
Value35
Percentage of UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary


Unrecorded
Period End2020-12-312019-12-31
Value124118
Percentage of UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary100.0100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary


Unrecorded
Period End2020-12-31
Value43
Percentage of UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount


Unrecorded
Period End2020-12-312019-12-31
Value624677
Percentage of UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount100.0100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased

us-gaap:CapitalAdditions


Unrecorded
Period End2020-12-312019-12-31
Value561820
Percentage of UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount89.8121.1

us-gaap:UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears

us-gaap:UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears


Unrecorded
Period End2020-12-31
Value139
Percentage of UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears100.0

Line plots across dimensions of each concept


EBT Margin
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
E B T  Marginus-gaap: Consolidated Entities, us-gaap: Statement Business Segments
Operating Margin
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Operating  Marginus-gaap: Consolidated Entities, us-gaap: Statement Business Segments
TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Income Loss From Continuing Operations 
Before Income Taxes Extraordinary Items Noncontrolling Interestus-gaap: Consolidated Entities, us-gaap: Statement Business Segments
us-gaap:OperatingIncomeLoss
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Operating Income Lossus-gaap: Consolidated Entities, us-gaap: Statement Business Segments
us-gaap:ProfitLoss
us-gaap:StatementEquityComponents
(None,)
Profit Lossus-gaap: Statement Equity Components
us-gaap:Revenues
us-gaap:StatementGeographical
(None,)
Revenuesus-gaap: Statement Geographical
us-gaap:Revenues
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Revenuesus-gaap: Consolidated Entities, us-gaap: Statement Business Segments
us-gaap:Revenues
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
('us-gaap:OperatingSegments', None, 'stld:OtherSegments')
Revenuesus-gaap: Consolidated Entities, us-gaap: Statement Business Segments, us-gaap: Subsegments
us-gaap:Assets
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Assetsus-gaap: Consolidated Entities, us-gaap: Statement Business Segments
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:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents
(None,)
Stockholders Equity Including Portion Attributable To Noncontrolling Interestus-gaap: Statement Equity Components
us-gaap:DepreciationDepletionAndAmortization
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Depreciation Depletion And Amortizationus-gaap: Consolidated Entities, us-gaap: Statement Business Segments
us-gaap:ProfitLoss
us-gaap:StatementEquityComponents
(None,)
Profit Lossus-gaap: Statement Equity Components
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Payments To Acquire Property Plant And Equipmentus-gaap: Consolidated Entities, us-gaap: Statement Business Segments