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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory, Net [Abstract]  
Schedule Of Inventory
The classes of inventory as of December 31 are summarized as follows ($ in millions):
 
2019
 
2018
Finished goods
$
833.5

 
$
864.4

Work in process
284.9

 
279.6

Raw materials
509.9

 
487.4

Total
$
1,628.3

 
$
1,631.4