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Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]  
Schedule of Accrued Liabilities
Accrued liabilities consist of following:
 December 31,
 20202019
 (Dollars in millions)
Accrued benefits$18.3 $21.7 
Current portion of postretirement benefit obligation2.8 2.9 
Other taxes payable9.8 9.9 
Current portion of black lung liability4.6 4.6 
Accrued legal6.4 2.7 
Other7.9 5.5 
Total accrued liabilities$49.8 $47.3