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 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Investment Income, Net [Abstract]        
Interest income on corporate funds $ 2.1 $ 2.0 $ 4.0 $ 3.9
Interest expense (0.3) (0.3) (0.5) (0.6)
Net loss from equity-method investments (0.2) (0.3) (0.5) (0.5)
Investment income, net $ 1.6 $ 1.4 $ 3.0 $ 2.8