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Leases (Right-of-Use Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Lessee, Lease, Description [Line Items]    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Net Property, Plant and Equipment Net Property, Plant and Equipment
Finance Lease, Right-of-Use Asset $ 165.7 $ 176.8
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Deferred charges and other Deferred charges and other
Operating Lease, Right-of-Use Asset $ 33.8 $ 39.9
Total leased assets $ 199.5 $ 216.7
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Long-term Debt and Lease Obligation, Current Long-term Debt and Lease Obligation, Current
Finance Lease, Liability, Current $ 28.1 $ 23.3
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current Other Liabilities, Current
Operating Lease, Liability, Current $ 6.7 $ 10.3
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long-term Debt and Lease Obligation Long-term Debt and Lease Obligation
Finance Lease, Liability, Noncurrent $ 157.5 $ 171.7
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other noncurrent liabilities Other noncurrent liabilities
Operating Lease, Liability, Noncurrent $ 27.9 $ 29.9
Total Lease Liability $ 220.2 $ 235.2