Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Plans (Other Information Pertaining to RSUs) (Details)

v3.20.2
Stock-Based Compensation Plans (Other Information Pertaining to RSUs) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
May 31, 2020
May 31, 2019
May 31, 2018
Time-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant-date fair value per share $ 73.28 $ 62.20 $ 51.15
Weighted-average remaining vesting period (years) 2 years 10 months 24 days 2 years 10 months 24 days 3 years 2 months 12 days
Total intrinsic value of RSUs vested $ 40.0 $ 1.2 $ 60.9
Aggregate intrinsic value of nonvested RSUs [1] 99.9 127.0 69.2
Total grant-date fair value of RSUs vested $ 23.6 $ 0.8 $ 42.4
Performance-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant-date fair value per share [2],[3] $ 80.59    
Weighted-average remaining vesting period (years) [3] 2 years 1 month 6 days    
Aggregate intrinsic value of nonvested RSUs [1],[3] $ 4.4    
[1] Based on the market price of the underlying common stock as of May 31, 2020, 2019 and 2018.
[2] For performance-based RSUs, granted number assumes achievement of performance goals at target. Actual number of shares to be earned may differ from this amount.
[3] No performance-based RSUs were granted during fiscal 2019 and fiscal 2018.