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Inventories (Tables)
6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consist of the following (in millions):
 
June 30,
2016
 
December 31,
2015
Inventories at FIFO, net of reserves
$
591.4

 
$
524.6

Less: LIFO reserve
(123.5
)
 
(117.2
)
Total inventories at LIFO, net of reserves
$
467.9

 
$
407.4