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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 9 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Schedule of Earnings Per Share, Basic and Diluted [Abstract]        
Earnings (loss) from continuing operations attributable to Class A and Common Shares (in Dollars) $ (12.1) $ (19.9) $ 16.1 $ 10.9
Earnings (loss) from discontinued operations attributable to Class A and Common Shares, net of tax (in Dollars) 0 (0.2) 0.2 (1.4)
Net income (loss) attributable to Class A and Common Shares (in Dollars) $ (12.1) $ (20.1) $ 16.3 $ 9.5
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share (in millions) (in Shares) 32.0 32.0 31.9 31.8
Dilutive effect of Class A Stock and Common Stock potentially issuable pursuant to stock-based compensation plans (in millions) (in Shares) 0 0 0.5 0.6
Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions) (in Shares) 32.0 32.0 32.4 32.4
Basic earnings (loss) per share:        
Earnings (loss) from continuing operations $ (0.38) $ (0.62) $ 0.50 $ 0.34
Earnings (loss) from discontinued operations, net of tax $ 0.00 $ (0.01) $ 0.01 $ (0.04)
Net income (loss) (in Dollars per share) $ (0.38) $ (0.63) $ 0.51 $ 0.30
Diluted earnings (loss) per share:        
Earnings (loss) from continuing operations $ (0.38) $ (0.62) $ 0.50 $ 0.34
Earnings (loss) from discontinued operations, net of tax $ 0.00 $ (0.01) $ 0.00 $ (0.05)
Net income (loss) (in Dollars per share) $ (0.38) $ (0.63) $ 0.50 $ 0.29