Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Plans (Details 8)

v2.4.0.8
Stock-Based Compensation Plans (Details 8) (Unearned Performance Shares [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
May 31, 2014
Unearned Performance Shares [Member]
 
Unearned Performance Shares Activity [Roll Forward]  
Nonvested/unearned shares, Beginning balance 0.4
Nonvested/unearned shares, Beginning balance, Weighted-average grant-date fair value per share $ 27.89
Granted 0.2
Granted, Weighted-average grant-date fair value per share $ 35.69
Vested (0.1)
Vested, Weighted-average grant-date fair value per share $ 23.98
Forfeited 0
Forfeited, Weighted-average grant-date fair value per share $ 0.00
Nonvested/unearned shares, Ending balance 0.5
Nonvested/unearned shares, Ending balance, Weighted-average grant-date fair value per share $ 31.61