Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Plans (RSU Activity) (Details)

v3.19.2
Stock-Based Compensation Plans (RSU Activity) (Details) - Restricted Stock Units [Member] - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, Beginning balance, Awards 1.1    
Granted, Awards 0.5    
Vested, Awards    
Forfeited, Awards (0.1)    
Nonvested, Ending balance, Awards 1.5 1.1  
Nonvested, Beginning balance, Weighted-average grant-date fair value per share $ 48.79    
Granted, Weighted-average grant-date fair value per share 62.20 $ 51.15 $ 53.76
Vested, Weighted-average grant-date fair value per share 48.28    
Forfeited, Weighted-average grant-date fair value per share 52.68    
Nonvested, Ending balance, Weighted-average grant-date fair value per share $ 53.45 $ 48.79  
Nonvested, Weighted-average remaining vesting period (years) 2 years 10 months 24 days    
Nonvested, Aggregate intrinsic value [1] $ 127.0    
[1] Intrinsic value for RSUs is based on the market price of the underlying stock as of May 31, 2019.