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Accrued Liabilities - Components of Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Accrued Liabilities, Current [Abstract]    
Compensation and benefits $ 106.4 $ 130.8
Medical insurance and workers’ compensation 31.1 27.0
Franchise, property, sales and use taxes 16.0 17.5
Customer volume discounts and rebates 15.3 13.9
Severance, retention, and relocation 7.3 8.3
Environmental liabilities and asset retirement obligations 7.9 7.1
Other 9.5 15.4
Total $ 193.5 $ 220.0