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Investment Income, Net (Schedule of Investment Income, Net) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017
Investment Income, Net [Abstract] |  |  |  |
Interest income on corporate funds | $ 3.1 | $ 2.4 | $ 8.7 | $ 7.2
Interest expense | (1.1) | (0.6) | (3.2) | (1.9)
Net gain/(loss) from equity-method investments | 0.3 | (0.6) | 0.6 | (1.7)
Investment income, net | $ 2.3 | $ 1.2 | $ 6.1 | $ 3.6

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