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. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Earnings Per Share, Basic and Diluted [Abstract]
Net income (loss) attributable to Class A and Common Shares	$ (43.3)	$ (12.6)	$ (30.8)	$ (2.3)
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share	34.5	35.3	34.8	35.2
Dilutive effect of Class A Stock and Common Stock potentially issuable pursuant to stock-based compensation plans	0.0	0.0	0.0	0.0
Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions)	34.5	35.3	34.8	35.2
Earnings (loss) per share of Class A Stock and Common Stock:
Basic (in Dollars per share)	$ (1.25)	$ (0.36)	$ (0.89)	$ (0.07)
Diluted (in Dollars per share)	$ (1.25)	$ (0.36)	$ (0.89)	$ (0.07)