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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class
The following schedule details inventories by major class ($ in millions):
 
March 31,
2019
 
December 31,
2018
Raw materials
$
54.0

 
$
50.2

Work in process
23.8

 
22.4

Finished goods
67.4

 
69.9

Supplies and other
9.3

 
9.0

Total
$
154.5

 
$
151.5