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Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Payables and Accruals [Abstract]    
Accrued benefits $ 22.9 $ 21.7
Current portion of postretirement benefit obligation 2.6 2.6
Other taxes payable 12.1 9.2
Current portion of black lung liability 5.4 5.4
Accrued legal 5.1 4.5
Other 6.9 9.0
Total accrued liabilities $ 55.0 $ 52.4