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Leases (Right-of-Use Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
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 $ 222.9 $ 184.3
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 $ 26.4 $ 32.9
Total leased assets $ 249.3 $ 217.2
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 $ 22.9 $ 23.8
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current Other Liabilities, Current
Operating Lease, Liability, Current $ 9.1 $ 8.3
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 $ 223.3 $ 181.6
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent Other Liabilities, Noncurrent
Operating Lease, Liability, Noncurrent $ 18.2 $ 25.8
Total Lease Liability $ 273.5 $ 239.5