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Accrued Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Accrued Liabilities [Abstract]    
Compensation and benefits $ 73.6 $ 120.4
Medical insurance and workers’ compensation 28.8 28.8
Franchise, property, and sales and use taxes 15.5 16.7
Customer volume discounts and rebates 14.7 18.9
Environmental liabilities and asset retirement obligations 5.9 6.4
Severance, retention, and relocation 3.3 3.0
Other 5.3 7.0
Total $ 147.1 $ 201.2