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Inventories (Tables)
 6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class
The following schedule details inventories by major class ($ in millions):
 
June 30,
2016
 
December 31,
2015
Raw materials
$
38.8

 
$
45.2

Work in process
19.4

 
17.3

Finished goods
40.5

 
36.1

Supplies and other
9.4

 
13.8

Total
$
108.1

 
$
112.4