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Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Accrued Liabilities Current [Abstract]    
Compensation and benefits $ 119.3 $ 120.4
Medical insurance and workers’ compensation 28.8 28.8
Franchise, property, sales and use taxes 22.8 16.7
Customer volume discounts and rebates 21.0 18.9
Environmental liabilities and asset retirement obligations 4.2 6.4
Severance, retention, and relocation 4.2 3.0
Other 7.5 7.0
Total $ 207.8 $ 201.2