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Inventories (Tables)
 3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class
The following schedule details inventories by major class ($ in millions):
 
March 31,
2018
 
December 31,
2017
Raw materials
$
48.9

 
$
50.4

Work in process
23.1

 
21.3

Finished goods
71.3

 
74.2

Supplies and other
9.6

 
9.3

Total
$
152.9

 
$
155.2