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Leasing - Right of Use Assets and Lease Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Right of use assets and lease liabilities [Line Items]    
Finance Lease, Right-of-Use Asset $ 102.4 $ 106.2
Operating lease right-of-use assets 115.6 107.2
Finance Lease, Liability 98.5 105.4
Operating Lease, Liability 117.4 108.3
Property, plant and equipment, net [Member]    
Right of use assets and lease liabilities [Line Items]    
Finance Lease, Right-of-Use Asset 102.4 106.2
Operating lease right-of-use assets 0.0 0.0
Operating lease right-of-use assets [Member]    
Right of use assets and lease liabilities [Line Items]    
Finance Lease, Right-of-Use Asset 0.0 0.0
Operating lease right-of-use assets 115.6 107.2
Current portion of operating lease liabilities    
Right of use assets and lease liabilities [Line Items]    
Finance Lease, Liability 0.0 0.0
Operating Lease, Liability 21.9 21.1
Accrued expenses and other [Member]    
Right of use assets and lease liabilities [Line Items]    
Finance Lease, Liability 11.2 13.0
Operating Lease, Liability 0.0 0.0
Long-term portion of operating lease liabilities    
Right of use assets and lease liabilities [Line Items]    
Finance Lease, Liability 0.0 0.0
Operating Lease, Liability 95.5 87.2
Postretirement benefits and other long-term liabilities [Member]    
Right of use assets and lease liabilities [Line Items]    
Finance Lease, Liability 87.3 92.4
Operating Lease, Liability $ 0.0 $ 0.0