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Accrued Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Accrued Liabilities [Abstract]    
Compensation and benefits $ 97.8 $ 130.8
Medical insurance and workers’ compensation 30.2 27.0
Franchise, property, and sales and use taxes 18.2 17.5
Customer volume discounts and rebates 13.7 13.9
Environmental liabilities and asset retirement obligations 8.8 7.1
Severance, retention, and relocation 12.0 8.3
Other 8.7 15.4
Total $ 189.4 $ 220.0