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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class The following schedule details inventories by major class ($ in millions):
 
December 31,
 
2019
 
2018
Raw materials
$
61.1

 
$
50.2

Work in process
20.7

 
22.4

Finished goods
65.3

 
69.9

Supplies and other
14.3

 
9.0

Total
$
161.4

 
$
151.5