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Inventories (Tables)
12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class
The following schedule details inventories by major class ($ in millions):
 
December 31,
 
2016
 
2015
Raw materials
$
40.9

 
$
45.2

Work in process
23.9

 
17.3

Finished goods
44.9

 
36.1

Supplies and other
9.7

 
13.8

Total
$
119.4

 
$
112.4