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Accrued Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Accrued Liabilities [Abstract]    
Compensation and benefits $ 88.7 $ 106.4
Medical insurance and workers’ compensation 30.1 31.1
Franchise, property, and sales and use taxes 17.7 16.0
Customer volume discounts and rebates 16.4 15.3
Environmental liabilities and asset retirement obligations 7.4 7.9
Severance, retention, and relocation 2.7 7.3
Other 7.2 9.5
Total $ 170.2 $ 193.5