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Accounts Payable and Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2018
Payables and Accruals [Abstract] |
Accounts payable and accrued expenses | Accounts payable and accrued expenses consisted of the following:
| December 31, 2018 |  | December 31, 2017
| (Dollars in millions)
Trade accounts payable | $ | 281.7 |  |  | $ | 388.0 |
Accrued payroll and related benefits | 209.3 |  |  | 239.7 |
Other accrued expenses | 184.9 |  |  | 197.7 |
Accrued taxes other than income | 111.4 |  |  | 111.7 |
Accrued royalties | 52.7 |  |  | 67.4 |
Asset retirement obligations | 63.8 |  |  | 34.1 |
Income taxes payable | 10.0 |  |  | 20.6 |
Accrued interest | 15.7 |  |  | 15.5 |
Accrued health care insurance | 10.0 |  |  | 10.6 |
Workers’ compensation obligations | 7.0 |  |  | 7.6 |
Intangible take-or-pay contracts | 20.3 |  |  | 27.6 |
Liabilities from coal trading activities | 1.2 |  |  | 11.7 |
Liabilities associated with discontinued operations | 54.0 |  |  | 70.6 |
Accounts payable and accrued expenses | $ | 1,022.0 |  |  | $ | 1,202.8 |

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