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Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]    
Accrued benefits $ 29.7 $ 21.7
Current portion of postretirement benefit obligation 2.4 2.6
Other taxes payable 9.8 9.2
Current portion of black lung liability 5.9 5.4
Accrued legal 4.9 4.5
Other 8.7 9.6
Total accrued liabilities $ 61.4 $ 53.0