Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Commitments for Operating Leases and Long-Term Purchase Obligations

As of December 31, 2015, future minimum commitments for operating leases and long-term purchase obligations for the years ending December 31 are as follows:

	Operating Leases		Long-Term Purchase Obligations
	(Dollars in millions)
2016	$	57.5	$	286.3
2017	48.9		166.0
2018	36.3		129.3
2019	30.6		0.9
2020	29.4		—
Thereafter	36.9		—
Total minimum commitments	$	239.6	$	582.5