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Inventories, Net
 9 Months Ended
Sep. 30, 2015
Inventory, Net [Abstract]  
Inventories, Net
Inventories, Net
Inventories are stated at the lower of cost or market value. The components of net inventories were as follows (in millions):
 
September 30, 2015
 
December 31, 2014
Materials and supplies
$
121.9

 
$
117.9

Work in process
129.5

 
104.5

Finished products
647.4

 
486.1

 
$
898.8

 
$
708.5