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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
12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Earnings Per Share [Abstract]      
Earnings (loss) from continuing operations attributable to Class A and Common Shares $ 44.2 $ 35.7 $ 107.6
Earnings (loss) from discontinued operations attributable to Class A and Common Shares, net of tax 0.1 (4.7) (5.7)
Net income (loss) attributable to Class A and Common Shares $ 44.3 $ 31.0 $ 101.9
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share (in millions) 32.0 31.8 31.2
Dilutive effect of Class A Stock and Common Stock potentially issuable pursuant to stock-based compensation plans (in millions) 0.5 0.6 0.5
Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions) 32.5 32.4 31.7
Basic:      
Earnings (loss) from continuing operations (in Dollars per share) $ 1.38 $ 1.12 $ 3.45
Earnings (loss) from discontinued operations (in Dollars per share) $ 0.01 $ (0.15) $ (0.18)
Net income (loss) (in Dollars per share) $ 1.39 $ 0.97 $ 3.27
Diluted:      
Earnings (loss) from continuing operations (in Dollars per share) $ 1.36 $ 1.10 $ 3.39
Earnings (loss) from discontinued operations (in Dollars per share) $ 0.00 $ (0.15) $ (0.18)
Net income (loss) (in Dollars per share) $ 1.36 $ 0.95 $ 3.21