Annual report pursuant to Section 13 and 15(d)

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

v3.21.2
Stock-Based Compensation Plans (Other Information Pertaining to RSUs) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Time-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant-date fair value per share $ 67.92 $ 73.28 $ 62.20
Weighted-average remaining vesting period (years) 3 years 2 years 10 months 24 days 2 years 10 months 24 days
Total intrinsic value of RSUs vested $ 32.6 $ 40.0 $ 1.2
Aggregate intrinsic value of nonvested RSUs [1] 152.7 99.9 127.0
Total grant-date fair value of RSUs vested $ 25.6 $ 23.6 $ 0.8
Performance-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant-date fair value per share [3] [2] $ 80.59
Weighted-average remaining vesting period (years) [3] 1 year 1 month 6 days 2 years 1 month 6 days  
Total intrinsic value of RSUs vested [3]
Aggregate intrinsic value of nonvested RSUs [1],[3] 6.2 4.4  
Total grant-date fair value of RSUs vested [3]
[1] Based on the market price of the underlying common stock as of May 31, 2021, 2020 and 2019.
[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 2021 or fiscal 2019.