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Accrued Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2018
Accrued Liabilities Current And Noncurrent [Abstract] |
Components of Accrued Liabilities | The components of accrued liabilities were as follows (dollars in millions):
|  | September 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Compensation and benefits |  | $ | 131.1 |  |  | $ | 127.5 |
Medical insurance and workers’ compensation |  |  | 27.0 |  |  |  | 23.9 |
Customer volume discounts and rebates |  |  | 21.5 |  |  |  | 23.4 |
Franchise, property, sales and use taxes |  |  | 21.3 |  |  |  | 16.0 |
Environmental liabilities and asset retirement obligations |  |  | 4.7 |  |  |  | 4.0 |
Severance, retention, and relocation |  |  | 3.3 |  |  |  | 3.1 |
Other |  |  | 14.5 |  |  |  | 5.3 |
Total |  | $ | 223.4 |  |  | $ | 203.2 |

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