Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2015

Balance Sheet Related Disclosures [Abstract]

Accrued liabilities

Accrued liabilities consist of following:

	December 31,
	2015		2014
	(Dollars in millions)
Accrued benefits	$	20.3	$	27.4
Other taxes payable	8.4		11.7
Accrued severance	4.7		13.0
Deferred revenue	2.1		—
Current portion of black lung liability	5.2		3.8
Other	5.1		15.4
Total accrued liabilities	$	45.8	$	71.3