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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 6 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2013
Nov. 30, 2012
Schedule of Earnings Per Share, Basic and Diluted [Abstract]        
Earnings (loss) from continuing operations attributable to Class A and Common Shares (in Dollars) $ 58.2 $ 62.4 $ 28.1 $ 30.8
Earnings (loss) from discontinued operations attributable to Class A and Common Shares, net of tax (in Dollars) 0 (0.8) 0.2 (1.2)
Net income (loss) attributable to Class A and Common Shares (in Dollars) $ 58.2 $ 61.6 $ 28.3 $ 29.6
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share (in millions) (in Shares) 31.9 31.9 31.8 31.7
Dilutive effect of Class A Stock and Common Stock potentially issuable pursuant to stock-based compensation plans (in millions) (in Shares) 0.4 0.8 0.6 0.7
Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions) (in Shares) 32.3 32.7 32.4 32.4
Basic earnings (loss) per share:        
Earnings (loss) from continuing operations $ 1.82 $ 1.95 $ 0.88 $ 0.97
Earnings (loss) from discontinued operations, net of tax $ 0.00 $ (0.02) $ 0.01 $ (0.04)
Net income (loss) $ 1.82 $ 1.93 $ 0.89 $ 0.93
Diluted earnings (loss) per share:        
Earnings (loss) from continuing operations $ 1.80 $ 1.91 $ 0.87 $ 0.95
Earnings (loss) from discontinued operations, net of tax $ 0.00 $ (0.02) $ 0.01 $ (0.04)
Net income (loss) $ 1.80 $ 1.89 $ 0.88 $ 0.91