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Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Payables and Accruals [Abstract]    
Accrued benefits $ 21.6 $ 29.7
Current portion of postretirement benefit obligation 2.4 2.4
Other taxes payable 12.8 9.8
Current portion of black lung liability 5.9 5.9
Accrued legal 0.6 4.9
Accrued losses on purchase commitments 6.0 0.0
Other 5.6 8.1
Total accrued liabilities $ 54.9 $ 60.8