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Leases (Right-of-Use Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
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 $ 184.3 $ 153.4
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 $ 32.9 $ 35.7
Total leased assets $ 217.2 $ 189.1
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 $ 23.8 $ 30.0
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current Other Liabilities, Current
Operating Lease, Liability, Current $ 8.3 $ 4.8
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 $ 181.6 $ 144.7
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other noncurrent liabilities Other noncurrent liabilities
Operating Lease, Liability, Noncurrent $ 25.8 $ 31.9
Total Lease Liability $ 239.5 $ 211.4