Earnings (Loss) Per Share (Details) - Schedule of Earnings Per Share, Basic and Diluted (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Aug. 31, 2013		Aug. 31, 2012
Schedule of Earnings Per Share, Basic and Diluted [Abstract]
Earnings (loss) from continuing operations attributable to Class A and Common Shares (in Dollars)	$ (30.1)		$ (31.7)
Earnings (loss) from discontinued operations attributable to Class A and Common Shares, net of tax (in Dollars)	0.2		(0.4)
Net income (loss) attributable to Class A and Common Shares (in Dollars)	$ (29.9)		$ (32.1)
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share (in millions) (in Shares)	31.8		31.5
Dilutive effect of Class A Stock and Common Stock potentially issuable pursuant to stock-based compensation plans (in millions) (in Shares)		[1]		[1]
Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions) (in Shares)		[1]		[1]
Basic earnings (loss) per share:
Earnings (loss) from continuing operations	$ (0.94)		$ (1.01)
Earnings (loss) from discontinued operations, net of tax	$ 0.00		$ (0.01)
Net income (loss)	$ (0.94)		$ (1.02)
Diluted earnings (loss) per share:
Earnings (loss) from continuing operations	$ (0.94)		$ (1.01)
Earnings (loss) from discontinued operations, net of tax	$ 0.00		$ (0.01)
Net income (loss)	$ (0.94)		$ (1.02)

[1] In each of the three month periods ended August 31, 2013 and 2012, the Company experienced a loss from continuing operations and therefore did not report any dilutive share impact.