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Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Payables and Accruals [Abstract] |  |
Accrued payroll and related benefits | $ 170.5 | $ 163.9
Trade accounts payable | 201.7 | 146.3
Other accrued expenses | 161.3 | 120.6
Accrued taxes other than income | 78.8 | 80.4
Asset retirement obligations | 65.0 | 77.7
Accrued royalties | 51.4 | 25.8
Liabilities associated with discontinued operations | 45.0 | 62.3
Operating lease liabilities | 16.4 | 24.5
Accrued insurance | 17.8 | 15.7
Accrued interest | 6.0 | 15.5
Workers’ compensation obligations | 8.5 | 9.0
Income taxes payable | 20.2 | 2.3
Liabilities from coal trading activities | 29.5 | 1.7
Accounts payable and accrued expenses | $ 872.1 | $ 745.7

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