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Leases (Right-of-Use Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
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 $ 153.4 $ 165.7
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 $ 35.7 $ 33.8
Total leased assets $ 189.1 $ 199.5
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 $ 30.0 $ 28.1
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current Other Liabilities, Current
Operating Lease, Liability, Current $ 4.8 $ 6.7
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 $ 144.7 $ 157.5
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other noncurrent liabilities Other noncurrent liabilities
Operating Lease, Liability, Noncurrent $ 31.9 $ 27.9
Total Lease Liability $ 211.4 $ 220.2