Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Stockholders' Equity (Parenthetical)

v3.21.1
Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Unrealized gains (losses) on securities, tax $ 6.5 $ 11.3 $ 4.1 $ 16.5
Reclassification adjustment for realized gains on securities, tax   $ 0.1 $ 0.2 $ 0.5
Cash dividends declared, per share $ 0.62 $ 0.62 $ 1.86 $ 1.86
Authorized In May 2019 [Member]        
Approved repurchase amount $ 400.0 $ 400.0 $ 400.0 $ 400.0
Expiration date May 31, 2022 May 31, 2022 May 31, 2022 May 31, 2022