Earnings (Loss) Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
Earnings Per Share [Abstract]
Net income (loss) attributable to Class A and Common Shares	$ 12.1	$ 86.3	$ 80.6
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share (in millions)	29,600,000	33,800,000	34,500,000
Dilutive effect of Class A Stock and Common Stock potentially issuable pursuant to stock-based compensation plans (in millions)	800,000	900,000	1,100,000
Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions)	30,400,000	34,700,000	35,600,000
Basic:
Basic earnings (loss) per share (in Dollars per share)	$ 0.41	$ 2.56	$ 2.33
Diluted:
Diluted earnings (loss) per share (in Dollars per share)	$ 0.40	$ 2.49	$ 2.27
Number of potentially antidilutive shares outstanding	900,000	600,000	1,600,000