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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class
The following schedule details inventories by major class ($ in millions):
 
September 30,
2017
 
December 31,
2016
Raw materials
$
53.7

 
$
40.9

Work in process
23.0

 
23.9

Finished goods
58.1

 
44.9

Supplies and other
9.1

 
9.7

Total
$
143.9

 
$
119.4