Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Plans (Details 5)

v2.4.0.6
Stock-Based Compensation Plans (Details 5) (Restricted Stock Unit [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
May 31, 2012
Y
May 31, 2011
May 31, 2010
Restricted Stock Unit [Member]
     
Nonvested/unearned shares activity      
Nonvested/ unearned shares outstanding, Beginning balance 1.4 1.2 0.9
Nonvested/ unearned shares, weighted-average grant date fair value per share, Beginning balance $ 24.83 $ 27.39 $ 32.93
Granted 0.6 0.6 0.6
Granted, Weighted-average grant-date fair value per share $ 27.67 $ 21.52 $ 20.62
Vested (0.3) (0.3) (0.2)
Vested, Weighted-average grant-date fair value per share $ 26.87 $ 28.96 $ 34.01
Forfeited (0.1) (0.1) (0.1)
Forfeited, Weighted-average grant-date fair value per share $ 25.41 $ 25.08 $ 28.88
Nonvested/ unearned shares outstanding, Weighted-average grant-date fair value per share, Ending balance $ 25.49 $ 24.83 $ 27.39
Nonvested/ unearned shares outstanding, Ending balance 1.6 1.4 1.2
Weighted-average remaining vesting period (years) 1.5    
Aggregate intrinsic value, Ending balance $ 46.8