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Capital Stock and Stock-Based Awards - Schedule of Intrinsic value of stock options exercised, pretax stock-based compensation cost and related tax benefits (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Share-Based Payment Arrangement [Abstract]      
Total intrinsic value of stock options exercised $ 0.5 $ 6.4 $ 8.2
Total stock-based compensation cost (pretax) 9.3 11.0 10.5
Tax benefits (shortfalls) related to stock-based compensation cost $ (2.5) $ 5.0 $ (7.8)
Weighted average grant date fair value per option (in Dollars per share) $ 11.92 $ 11.53 $ 11.62