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Accrued Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Balance Sheet Related Disclosures [Abstract] |  |
Accrued benefits | $ 18.3 | $ 21.7
Current portion of postretirement benefit obligation | 2.8 | 2.9
Other taxes payable | 9.8 | 9.9
Current portion of black lung liability | 4.6 | 4.6
Accrued legal | 6.4 | 2.7
Other | 7.9 | 5.5
Total accrued liabilities | $ 49.8 | $ 47.3

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