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Accrued Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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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

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