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 9 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Investment Income, Net [Abstract]        
Interest income on corporate funds $ 1.9 $ 1.4 $ 5.2 $ 5.3
Interest expense (0.2) 0 (1.0) (0.1)
Net loss from equity-method investments (0.2) 0 (0.2) 0
Investment income, net $ 1.5 $ 1.4 $ 4.0 $ 5.2