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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Accrued payroll and related benefits $ 163.9 $ 186.2
Trade accounts payable 146.3 254.8
Other accrued expenses 116.2 118.5
Accrued taxes other than income 80.4 99.0
Asset retirement obligations 77.7 98.2
Accrued royalties 25.8 61.7
Liabilities associated with discontinued operations 62.3 58.8
Operating lease liabilities 24.5 29.6
Accrued health care insurance 15.7 15.8
Accrued interest 15.5 15.0
Workers’ compensation obligations 9.0 8.4
Intangible take-or-pay contracts 4.4 8.4
Income taxes payable 2.3 2.6
Liabilities from coal trading activities 1.7 0.0
Accounts payable and accrued expenses $ 745.7 $ 957.0