Earnings 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, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Earnings Per Share, Basic and Diluted [Abstract]
Net income (loss) attributable to Class A and Common Shares	$ (12.6)	$ (49.2)	$ (2.3)	$ (55.8)
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share	35.3	34.9	35.2	35.1
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	35.3	34.9	35.2	35.1
Earnings (loss) per share of Class A Stock and Common Stock:
Basic (in Dollars per share)	$ (0.36)	$ (1.41)	$ (0.07)	$ (1.59)
Diluted (in Dollars per share)	$ (0.36)	$ (1.41)	$ (0.07)	$ (1.59)