Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

At December 31, 2015, future minimum lease payments required under operating leases having initial or remaining non-cancellable lease terms for the next five years are as follows:

(dollars in millions)
2016	$	3.9
2017	3.7
2018	2.6
2019	2.5
2020	2.3
Thereafter	22.0
Total	$	37.0

Schedule of Change in Asset Retirement Obligation [Table Text Block]

The following table presents the activity for the Company’s asset retirement obligations, which are included in "Other noncurrent liabilities" in the Consolidated Balance Sheets:

	December 31,
(dollars in millions)	2015			2014
Balance, beginning of period	$	1.6		$	1.7
Asset retirement obligations reclassified from discontinued operations	10.9			—
Liabilities settled	(5.0		)	(0.2		)
Revision to estimated cash flow	(2.9		)	—
Accretion expense	0.2			0.1
Balance, end of period	$	4.8		$	1.6