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Inventories, net (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consist of the following (in millions):
 
June 30,
2017
 
December 31,
2016
Inventories at FIFO, net of reserves
$
669.1

 
$
727.0

Less: LIFO reserve
(139.2
)
 
(130.4
)
Total inventories at LIFO, net of reserves
$
529.9

 
$
596.6