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Investment Income, Net (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2016 | Feb. 28, 2015 | Feb. 29, 2016 | Feb. 28, 2015
Investment Income, Net [Abstract] |  |  |  |
Interest income on corporate funds | $ 2.1 | $ 2.0 | $ 6.1 | $ 5.9
Interest expense | (0.2) | (0.1) | (0.7) | (0.7)
Net loss from equity-method investments | (0.2) | (0.3) | (0.7) | (0.8)
Investment income, net | $ 1.7 | $ 1.6 | $ 4.7 | $ 4.4

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- Definition Interest expense on all other items not previously classified. For example, includes dividends associated with redeemable preferred stock of a subsidiary that is treated as a liability in the parent's consolidated balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624177-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph -4 -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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