Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Plans (LTIP Performance-Based Restricted Stock Activity) (Details)

v3.20.2
Stock-Based Compensation Plans (LTIP Performance-Based Restricted Stock Activity) (Details) - LTIP Performance-Based Restricted Stock [Member]
shares in Millions
12 Months Ended
May 31, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested, Beginning balance | shares 0.2
Granted | shares
Exercised | shares
Forfeited | shares (0.1)
Expired | shares
Nonvested, Ending balance | shares 0.1
Nonvested, Beginning balance, Weighted-average grant-date fair value per share | $ / shares $ 54.31
Granted, Weighted-average grant-date fair value per share | $ / shares
Exercised, Weighted-average grant-date fair value per share | $ / shares
Forfeited, Weighted-average grant-date fair value per share | $ / shares 56.97
Expired, Weighted-average grant-date fair value per share | $ / shares
Nonvested, Ending balance, Weighted-average grant-date fair value per share | $ / shares $ 53.97