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LIFO Expense (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Inventory Disclosure [Abstract]        
Percentage of LIFO inventory 55.00%   55.00%  
LIFO benefit (expense) $ 0 $ 2.2 $ 0 $ 4.8