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Leases (Right-of-Use Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]      
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:NetPropertyPlantandEquipment us-gaap:NetPropertyPlantandEquipment  
Finance Lease, Right-of-Use Asset $ 176.8 $ 179.5  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:DeferredChargesAndOther us-gaap:DeferredChargesAndOther  
Operating Lease, Right-of-Use Asset $ 39.9 $ 64.2 $ 57.0
Total leased assets $ 216.7 $ 243.7  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:Currentportionoflong-termdebt us-gaap:Currentportionoflong-termdebt  
Finance Lease, Liability, Current $ 23.3 $ 13.4  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherAccruals us-gaap:OtherAccruals  
Operating Lease, Liability, Current $ 10.3 $ 13.2  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:Long-termDebtExcludingAmountsDueWithinOneYear us-gaap:Long-termDebtExcludingAmountsDueWithinOneYear  
Finance Lease, Liability, Noncurrent $ 171.7 $ 188.1  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherNoncurrentLiabilities us-gaap:OtherNoncurrentLiabilities  
Operating Lease, Liability, Noncurrent $ 29.9 $ 51.6  
Total Lease Liability $ 235.2 $ 266.3