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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
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