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Leasing - Right of Use Assets and Lease Liabilities (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Right of use assets and lease liabilities [Line Items]  
Finance Lease, Right-of-Use Asset $ 7.3
Operating Lease, Right-of-Use Asset 118.5
Finance Lease, Liability 7.3
Operating Lease, Liability 118.5
Property, Plant and Equipment [Member]  
Right of use assets and lease liabilities [Line Items]  
Finance Lease, Right-of-Use Asset 7.3
Operating Lease, Right-of-Use Asset 0.0
Other Assets and Deferred Charges [Member]  
Right of use assets and lease liabilities [Line Items]  
Finance Lease, Right-of-Use Asset 0.0
Operating Lease, Right-of-Use Asset 118.5
Accrued expenses and other [Member]  
Right of use assets and lease liabilities [Line Items]  
Finance Lease, Liability 3.3
Operating Lease, Liability 21.8
Postretirement benefits and other long-term liabilities [Member]  
Right of use assets and lease liabilities [Line Items]  
Finance Lease, Liability 4.0
Operating Lease, Liability $ 96.7