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Accounts Payable and Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2017
Payables and Accruals [Abstract] |
Accounts payable and accrued expenses | Accounts payable and accrued expenses consisted of the following:
| Successor | Predecessor
| December 31, 2017 | December 31, 2016
| (Dollars in millions)
Trade accounts payable | $ | 388.0 |  | $ | 288.6 |
Accrued payroll and related benefits | 239.7 |  | 201.2 |
Other accrued expenses | 225.3 |  | 190.1 |
Accrued taxes other than income | 111.7 |  | 119.6 |
Accrued royalties | 67.4 |  | 62.8 |
Asset retirement obligations | 34.1 |  | 41.0 |
Income taxes payable | 20.6 |  | 6.2 |
Accrued interest | 15.5 |  | 1.2 |
Accrued health care insurance | 10.6 |  | 16.0 |
Workers’ compensation obligations | 7.6 |  | 7.8 |
Liabilities associated with discontinued operations | 70.6 |  | 55.9 |
Accounts payable and accrued expenses | $ | 1,191.1 |  | $ | 990.4 |

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