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Inventories
9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories are stated at the lower of cost or market. Cost is determined using the first-in, first-out method. Finished goods and work-in-process inventories include material, labor and manufacturing overhead costs. A summary of inventories is shown below (in millions):
 
September 30,
2017
 
December 31, 2016
Raw materials
$
909.2

 
$
746.3

Work-in-process
124.0

 
106.4

Finished goods
199.7

 
167.9

Inventories
$
1,232.9

 
$
1,020.6