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Leases - Schedule of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets    
Operating lease right-of-use assets $ 245.7 $ 276.5
Finance lease 322.8 327.0
Total leased assets 568.5 603.5
Current liabilities:    
Current operating lease liabilities 44.8 40.4
Finance lease 23.8 21.0
Noncurrent liabilities:    
Long-term operating lease liabilities 209.6 243.8
Finance lease 367.9 363.1
Total lease liabilities 646.1 $ 668.3
Finance lease right-of-use asset accumulated depreciation $ 129.6  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligations us-gaap:LongTermDebtAndCapitalLeaseObligations