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Accrued Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2016
Accrued Liabilities [Abstract] |
Components of Accrued Liabilities | The components of accrued liabilities were as follows (dollars in millions):
| March 31, 2016 |  | December 31, 2015
Compensation and benefits | $ | 64.3 |  |  | $ | 106.4 |
Medical insurance and workers’ compensation | 30.5 |  |  | 31.1 |
Franchise, property, and sales and use taxes | 15.1 |  |  | 16.0 |
Customer volume discounts and rebates | 11.9 |  |  | 15.3 |
Environmental liabilities and asset retirement obligations | 9.2 |  |  | 7.9 |
Severance, retention, and relocation | 4.8 |  |  | 7.3 |
Other | 8.6 |  |  | 9.5 |
Total | $ | 144.4 |  |  | $ | 193.5 |

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