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LIFO Expense (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Inventories [Line Items]        
Percentage of LIFO inventory 60.00%   60.00%  
LIFO (income) expense $ (2.6) $ 3.5 $ (2.1) $ 9.0