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Accounts Payable and Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2016
Payables and Accruals [Abstract] |
Accounts payable and accrued expenses | Accounts payable and accrued expenses consisted of the following:
| December 31,
| 2016 |  | 2015
| (Dollars in millions)
Trade accounts payable | $ | 288.6 |  |  | $ | 333.3 |
Accrued payroll and related benefits | 201.2 |  |  | 191.9 |
Other accrued expenses | 190.1 |  |  | 225.8 |
Accrued taxes other than income | 119.6 |  |  | 135.9 |
Accrued royalties | 62.8 |  |  | 41.0 |
Asset retirement obligations | 41.0 |  |  | 25.5 |
Accrued health care insurance | 16.0 |  |  | 15.8 |
Workers’ compensation obligations | 7.8 |  |  | 8.6 |
Income taxes payable | 6.2 |  |  | 6.8 |
Accrued interest | 1.2 |  |  | 68.8 |
Accrued environmental cleanup-related costs | — |  |  | 23.9 |
Other | — |  |  | 2.3 |
Payable to voluntary employee beneficiary associated for certain Patriot retirees (1) | — |  |  | 75.0 |
Commodity and foreign currency hedge contracts | — |  |  | 231.7 |
Liabilities associated with discontinued operations | 55.9 |  |  | 60.0 |
Total accounts payable and accrued expenses | $ | 990.4 |  |  | $ | 1,446.3 |
(1) | Refer to Note 27. "Matters Related to the Bankruptcy of Patriot Coal Corporation" herein for additional details related to this transaction.

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