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Inventories (Tables)
12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of inventory classes
The classes of inventory as of December 31 are summarized as follows ($ in millions):
 
2016
 
2015
Finished goods
$
198.3

 
$
184.1

Work in process
79.3

 
77.1

Raw materials
267.0

 
261.7

Total
$
544.6

 
$
522.9