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Inventories (Tables)
12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class
The following schedule details inventories by major class ($ in millions):
 
December 31,
 
2015
 
2014
Raw materials
$
45.2

 
$
35.1

Work in process
17.3

 
17.4

Finished goods
36.1

 
40.4

Supplies and other
13.8

 
15.5

Total
$
112.4

 
$
108.4