Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Accrued liabilities

Accrued liabilities consist of following:

	December 31,
	2019		2018
	(Dollars in millions)
Accrued benefits	$	21.7	$	21.2
Current portion of postretirement benefit obligation	2.9		3.0
Other taxes payable	9.9		9.1
Current portion of black lung liability	4.6		4.5
Other	7.9		7.8
Total accrued liabilities	$	47.0	$	45.6