XML 38 R43.htm IDEA: XBRL DOCUMENT v3.2.0.727
Stock-Based Compensation Plans (Details 4) - Restricted Stock Unit [Member] - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
RSU Activity [Roll Forward]      
Nonvested/unearned shares, Beginning balance 1.7    
Nonvested/unearned shares, Beginning balance, Weighted-average grant-date fair value per share $ 30.52    
Granted 0.7    
Granted, Weighted-average grant-date fair value per share $ 36.64 $ 36.37 $ 28.59
Vested (0.5)    
Vested, Weighted-average grant-date fair value per share $ 28.11    
Forfeited (0.1)    
Forfeited, Weighted-average grant-date fair value per share $ 32.60    
Nonvested/unearned shares, Ending balance 1.8 1.7  
Nonvested/unearned shares, Ending balance, Weighted-average grant-date fair value per share $ 33.57 $ 30.52  
Weighted-average remaining vesting period (years) 3 years    
Aggregate intrinsic value, Ending balance $ 88.8