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Other Financial Statement Disclosures - Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Other Financial Statement Disclosures [Abstract]    
Pension and other postretirement benefits $ 14.0 $ 31.4
Compensation and related employee costs 61.1 73.6
Interest 34.2 44.3
Income taxes 37.6 23.9
Other 13.2 12.8
Total accrued liabilities $ 160.1 $ 186.0