Operating Lease Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

Minimum future non-cancelable operating lease commitments were as follows:

($ amounts in millions)	Operating Lease Commitments
Year ending December 31,
2018	$	33.0
2019	25.0
2020	19.6
2021	13.9
2022	12.1
Thereafter	28.9
Total	$	132.5