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

 
December 31,
 
2013
 
2012
Raw materials
$
39.2

 
$
31.5

Work in process
24.4

 
23.4

Finished goods
50.9

 
36.8

Supplies and other
18.3

 
19.9

Total
$
132.8

 
$
111.6