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Investment Income, Net (Schedule of Investment Income, Net) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2016 | Nov. 30, 2015 | Nov. 30, 2016 | Nov. 30, 2015
Investment Income, Net [Abstract] |  |  |  |
Interest income on corporate funds | $ 2.4 | $ 2.1 | $ 4.8 | $ 4.0
Interest expense | (0.6) | (0.3) | (1.3) | (0.5)
Net loss from equity-method investments | (0.9) | (0.2) | (1.1) | (0.5)
Investment income, net | $ 0.9 | $ 1.6 | $ 2.4 | $ 3.0

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