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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Commitments For Non-Cancelable Leases
($ in millions)
 
Capital Leases
Operating Leases
Total
2015
 
$
3.1

$
9.1

$
12.2

2016
 
1.8

6.9

8.7

2017
 
0.8

5.9

6.7

2018
 

4.7

4.7

2019
 

3.7

3.7

After 2019
 

8.9

8.9

Total minimum payment required
 
$
5.7

$
39.2

$
44.9