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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Summary of Inventories
A summary of inventories is shown below (in millions):
 
June 30,
2018
 
December 31, 2017
Raw materials
$
898.8

 
$
869.3

Work-in-process
129.2

 
120.8

Finished goods
333.6

 
324.8

Reserves
(112.8
)
 
(109.2
)
Inventories
$
1,248.8

 
$
1,205.7