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Inventories (Tables)
 3 Months Ended
Mar. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class
The following schedule details inventories by major class ($ in millions):
 
March 31,
2016
 
December 31,
2015
Raw materials
$
43.5

 
$
45.2

Work in process
18.8

 
17.3

Finished goods
39.2

 
36.1

Supplies and other
9.5

 
13.8

Total
$
111.0

 
$
112.4