Quarterly report pursuant to Section 13 or 15(d)

Investment Income, Net (Details)

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Investment Income, Net (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Investment Income, Net [Abstract]    
Interest income on corporate funds $ 2.4 $ 1.9
Interest expense (0.7) (0.2)
Net loss from equity-method investments (0.2) (0.3)
Investment income, net $ 1.5 $ 1.4