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Inventories (Tables)
 9 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:
 (in Millions)
September 30, 2016
 
December 31, 2015
Finished goods
$
371.1

 
$
350.0

Work in process
255.1

 
275.4

Raw materials, supplies and other
347.1

 
335.6

First-in, first-out inventory
$
973.3

 
$
961.0

Less: Excess of first-in, first-out cost over last-in, first-out cost
(155.9
)
 
(160.8
)
Net inventories
$
817.4

 
$
800.2