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Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2022

Balance Sheet Related Disclosures [Abstract]

Schedule of accrued liabilities

Accrued liabilities consist of following:

			December 31,
			2022						2021
			(Dollars in millions)
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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Tabular disclosure of the components of accrued liabilities.

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