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Investment Income, Net (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2013 | Nov. 30, 2012 | Nov. 30, 2013 | Nov. 30, 2012
Investment Income, Net [Abstract] |  |  |  |
Interest income on corporate funds | $ 1.7 | $ 1.9 | $ 3.3 | $ 3.9
Interest expense | (0.4) | 0 | (0.8) | (0.1)
Investment income, net | $ 1.3 | $ 1.9 | $ 2.5 | $ 3.8

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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=7476318&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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- Definition The net amount of nonoperating interest income (expense). + References No definition available. + Details
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- Definition The aggregate amount of income from investments (for example, dividends) not considered a component of the entity's core operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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