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Earnings (Loss) Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Feb. 28, 2026
Feb. 28, 2025
Earnings Per Share, Basic and Diluted [Abstract]        
Net income (loss) attributable to Class A and Common Shares $ 62.5 $ (3.6) $ 47.3 $ (17.3)
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share 23.9 27.8 24.8 28.1
Weighted Average Number Diluted Shares Outstanding Adjustment 0.6 0.0 0.5 0.0
Weighted Average Number of Shares Outstanding, Diluted 24.5 27.8 25.3 28.1
Earnings (loss) per share of Class A Stock and Common Stock:        
Basic (in Dollars per share) $ 2.61 $ (0.13) $ 1.91 $ (0.61)
Diluted (in Dollars per share) $ 2.55 $ (0.13) $ 1.87 $ (0.61)
Antidilutive shares excluded from calculation of earnings per share (in shares) 1.3 1.9 1.4 1.7
Options outstanding pursuant to stock-based compensation plans (in millions) 2.1 2.7 2.1 2.7