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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventory classes
The classes of inventory as of December 31 are summarized as follows ($ in millions):
 
2019
 
2018
Finished goods
$
285.6

 
$
219.5

Work in process
100.4

 
103.1

Raw materials
254.3

 
251.9

Total
$
640.3

 
$
574.5