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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory
The classes of inventory as of December 31 are summarized as follows ($ in millions):
 
2019
 
2018
Finished goods
$
177.5

 
$
166.8

Work in process
29.0

 
34.3

Raw materials
71.4

 
77.6

Total
$
277.9

 
$
278.7