Quarterly report pursuant to Section 13 or 15(d)

Investment Income, Net (Details)

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Investment Income, Net (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Investment Income, Net [Abstract]    
Interest income on corporate funds $ 1.9 $ 1.6
Interest expense (0.3) (0.4)
Net loss from equity-method investments (0.2) 0
Investment income, net $ 1.4 $ 1.2