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, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Earnings Per Share, Basic and Diluted [Abstract]
Net income (loss) attributable to Class A and Common Shares	$ (13.9)	$ (43.3)	$ (18.6)	$ (30.8)
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share	34.3	34.5	34.3	34.8
Earnings (loss) per share of Class A Stock and Common Stock:
Basic (in Dollars per share)	$ (0.41)	$ (1.25)	$ (0.54)	$ (0.89)
Diluted (in Dollars per share)	$ (0.41)	$ (1.25)	$ (0.54)	$ (0.89)
Weighted Average Number Diluted Shares Outstanding Adjustment	0.0	0.0	0.0	0.0
Weighted Average Number of Shares Outstanding, Diluted	34.3	34.5	34.3	34.8