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Other Financial Statement Disclosures - Accrued Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Other Financial Statement Disclosures [Abstract]    
Pension and other postretirement benefits $ 15.8 $ 16.8
Compensation and related employee costs 37.3 45.0
Interest 39.6 34.0
Income taxes 6.2 7.1
Operating Lease, Liability, Current 3.5 0.0
Other 13.3 10.5
Total accrued liabilities $ 115.7 $ 113.4