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Investment Income, Net (Schedule of Investment Income, Net) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2017 | Feb. 29, 2016 | Feb. 28, 2017 | Feb. 29, 2016
Investment Income, Net [Abstract] |  |  |  |
Interest income on corporate funds | $ 2.4 | $ 2.1 | $ 7.2 | $ 6.1
Interest expense | (0.6) | (0.2) | (1.9) | (0.7)
Net loss from equity-method investments | (0.6) | (0.2) | (1.7) | (0.7)
Investment income, net | $ 1.2 | $ 1.7 | $ 3.6 | $ 4.7

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