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Leasing - Right of Use Assets and Lease Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Right of use assets and lease liabilities [Line Items]    
Finance Lease, Right-of-Use Asset $ 24.9 $ 7.3
Operating lease right-of-use assets 116.6 118.5
Finance Lease, Liability 21.6 7.3
Operating Lease, Liability 117.0 118.5
Property, plant and equipment, net [Member]    
Right of use assets and lease liabilities [Line Items]    
Finance Lease, Right-of-Use Asset 24.9 7.3
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 116.6 118.5
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 22.6 21.8
Accrued expenses and other [Member]    
Right of use assets and lease liabilities [Line Items]    
Finance Lease, Liability 3.3 3.3
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 94.4 96.7
Postretirement benefits and other long-term liabilities [Member]    
Right of use assets and lease liabilities [Line Items]    
Finance Lease, Liability 18.3 4.0
Operating Lease, Liability $ 0.0 $ 0.0