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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:
 (in Millions)
September 30, 2017
 
December 31, 2016
Finished goods
$
272.5

 
$
220.1

Work in process
247.0

 
219.3

Raw materials, supplies and other
222.5

 
166.7

First-in, first-out inventory
$
742.0

 
$
606.1

Less: Excess of first-in, first-out cost over last-in, first-out cost
(127.2
)
 
(127.2
)
Net inventories
$
614.8

 
$
478.9