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Inventories (Tables)
 12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consist of the following (in millions):
 
December 31, 2016
 
December 31, 2015
Inventories at FIFO, net of reserves
$
727.0

 
$
524.6

Less: LIFO reserve
(130.4
)
 
(117.2
)
Total inventories at LIFO, net of reserves
$
596.6

 
$
407.4