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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventories [Abstract]  
Schedule of Current Inventory
Inventories are comprised of the following:
 
December 31
 
2016
 
2017
Raw materials
$
577.1

 
$
735.2

Work in progress
133.0

 
168.3

Finished goods
180.5

 
158.3

 
$
890.6

 
$
1,061.8