Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

At December 31, 2016, future minimum rental payments under non-cancelable operating leases were:

Year	($ in millions)
2017	$	12.3
2018	10.9
2019	8.5
2020	5.4
2021	4.8
Thereafter	26.5
Total	$	68.4