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Inventories (Tables)
12 Months Ended
Dec. 31, 2014
Inventory Disclosure [Abstract]  
Schedule of inventories by major class
The following schedule details inventories by major class ($ in millions):
 
December 31,
 
2014
 
2013
Raw materials
$
35.1

 
$
39.2

Work in process
17.4

 
24.4

Finished goods
40.4

 
50.9

Supplies and other
15.5

 
18.3

Total
$
108.4

 
$
132.8