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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Payables and Accruals [Abstract]    
Accrued payroll and related benefits $ 199.4 $ 170.5
Trade accounts payable 240.7 201.7
Other accrued expenses 148.0 161.3
Accrued taxes other than income 20.0 78.8
Asset retirement obligations 84.2 65.0
Accrued royalties 88.4 51.4
Liabilities associated with discontinued operations 41.9 45.0
Operating lease liabilities 16.8 16.4
Accrued insurance 22.7 17.8
Accrued interest 8.2 6.0
Workers’ compensation obligations 9.3 8.5
Income taxes payable 25.9 20.2
Liabilities from coal trading activities 0.0 29.5
Accounts payable and accrued expenses $ 905.5 $ 872.1