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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Future minimum rental payments for operating leases
Future minimum obligations under non-cancelable operating leases having an initial or remaining term in excess of one year as of December 31, 2015 are as follows ($ in millions):
2016
$
4.5

2017
3.6

2018
2.7

2019
2.7

2020
2.7

Thereafter
13.2

Total
$
29.4