Annual report pursuant to Section 13 and 15(d)

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

v3.19.2
Stock-Based Compensation Plans (Other Information Pertaining to RSUs) (Details) - Restricted Stock Units [Member] - USD ($)
$ / shares in Units, $ 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]      
Weighted-average grant-date fair value per share $ 62.20 $ 51.15 $ 53.76
Total intrinsic value of RSUs vested $ 1.2 $ 60.9 $ 32.3
Total grant-date fair value of RSUs vested $ 0.8 $ 42.4 $ 19.3