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Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Summary of Inventories
A summary of inventories is shown below (in millions):
 
March 31,
2018
 
December 31, 2017
Raw materials
$
918.8

 
$
869.3

Work-in-process
129.0

 
120.8

Finished goods
334.6

 
324.8

Reserves
(116.1
)
 
(109.2
)
Inventories
$
1,266.3

 
$
1,205.7