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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class The following schedule details inventories by major class ($ in millions):
 
June 30,
2019
 
December 31,
2018
Raw materials
$
53.2

 
$
50.2

Work in process
27.3

 
22.4

Finished goods
64.5

 
69.9

Supplies and other
9.2

 
9.0

Total
$
154.2

 
$
151.5