Quarterly report pursuant to Section 13 or 15(d)

Basic and Diluted Earnings Per Share (Details Textual)

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Basic and Diluted Earnings Per Share (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Basic And Diluted Earnings Per Share (Textual)        
Common stock issued in connection with the exercise or vesting of stock-based awards 0.5 0.2 3.3 1.3
Stock repurchase program, Authorized amount     $ 350  
Stock repurchased and retired during period, Shares 1.1   5.0  
Stock repurchased and retired during period, Value $ 43.9   $ 203.0