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 |