Quarterly report pursuant to Section 13 or 15(d)

Investment Income, Net (Details)

v3.3.1.900
Investment Income, Net (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Investment Income, Net [Abstract]        
Interest income on corporate funds $ 2.1 $ 2.0 $ 6.1 $ 5.9
Interest expense (0.2) (0.1) (0.7) (0.7)
Net loss from equity-method investments (0.2) (0.3) (0.7) (0.8)
Investment income, net $ 1.7 $ 1.6 $ 4.7 $ 4.4