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Share-Based Awards and Options - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 6 Months Ended 12 Months Ended
Nov. 30, 2015
Nov. 30, 2014
May. 31, 2015
Options      
Outstanding, beginning of period (in shares) 894    
Granted (in shares) 145 400  
Forfeited (in shares) (6)    
Exercised (in shares) (128)    
Outstanding, end of period (in shares) 905   894
Options vested and exercisable (in shares) 586    
Weighted-Average Exercise Price      
Outstanding, weighted average exercise price, beginning of period (in dollars per share) $ 26    
Granted, weighted average exercise price (in dollars per share) 56    
Forfeited, weighted average exercise price (in dollars per share) 16    
Exercised, weighted average exercise price (in dollars per share) 23    
Outstanding, weighted average exercise price, end of period (in dollars per share) 31   $ 26
Options vested and exercisable, weighted average exercise price (in dollars per share) $ 23    
Outstanding, weighted average remaining contractual term 5 years 8 months 12 days   5 years 2 months 12 days
Options vested and exercisable, weighted average remaining contractual term 4 years 12 days    
Outstanding, beginning aggregate intrinsic value $ 23.9    
Outstanding, ending aggregate intrinsic value 37.3   $ 23.9
Options vested and exercisable, aggregate intrinsic value $ 28.6