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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		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Earnings Per Share, Basic and Diluted [Abstract]
Net income (loss) attributable to Class A and Common Shares	$ 68.0	$ 35.1	$ 43.9	$ (4.7)
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share	34.6	34.3	34.6	34.3
Earnings (loss) per share of Class A Stock and Common Stock:
Basic (in Dollars per share)	$ 1.97	$ 1.02	$ 1.27	$ (0.14)
Diluted (in Dollars per share)	$ 1.91	$ 1.02	$ 1.24	$ (0.14)
Weighted Average Number Diluted Shares Outstanding Adjustment	1.0	0.1	0.9	0.0
Weighted Average Number of Shares Outstanding, Diluted	35.6	34.4	35.5	34.3

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