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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventory classes The classes of inventory as of December 31 are summarized as follows ($ in millions):
 
2018
 
2017
Finished goods
$
219.5

 
$
201.3

Work in process
103.1

 
73.1

Raw materials
251.9

 
232.3

Total
$
574.5

 
$
506.7