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Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Accrued Liabilities [Abstract]    
Compensation and benefits $ 114.7 $ 106.4
Medical insurance and workers’ compensation 32.0 31.1
Franchise, property, and sales and use taxes 19.4 16.0
Customer volume discounts and rebates 20.1 15.3
Environmental liabilities and asset retirement obligations 7.1 7.9
Severance, retention, and relocation 3.3 7.3
Other 8.3 9.5
Total $ 204.9 $ 193.5