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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
Feb. 29, 2012
May 31, 2011
Consolidated Balance Sheets [Abstract]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 600.0 600.0
Common stock, shares issued 362.5 362.1
Common stock, shares outstanding 362.5 362.1