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Inventories, net (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consist of the following (in millions):
 
September 30,
2017
 
December 31,
2016
Inventories at FIFO, net of reserves
$
771.9

 
$
727.0

Less: LIFO reserve
(145.2
)
 
(130.4
)
Total inventories at LIFO, net of reserves
$
626.7

 
$
596.6