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Funds Held for Clients and Corporate Investments (Details 1) (USD $) In Millions, unless otherwise specified | Aug. 31, 2014 | May 31, 2014
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Classification of investments on the Consolidated Balance Sheets |  |
Funds held for clients | $ 4,066.8 | $ 4,198.6
Corporate investments | 96.7 | 398.7
Long-term corporate investments | 396.5 | 385.6
Total funds held for clients and corporate investments, Fair value | 4,560.0 | 4,982.9
Securities in an unrealized loss position |  |
Less than twelve months, Gross unrealized losses | 0 | (0.1)
Less than twelve months, Fair value | 58.3 | 118.8
Twelve months or longer, Gross unrealized losses | (1.3) | (2.9)
Twelve months or longer, Fair value | 208.4 | 276.4
Total, Gross unrealized losses | (1.3) | (3.0)
Total, Fair value | 266.7 | 395.2
General obligation municipal bonds [Member] |  |
Securities in an unrealized loss position |  |
Less than twelve months, Gross unrealized losses | 0 | (0.1)
Less than twelve months, Fair value | 16.3 | 69.6
Twelve months or longer, Gross unrealized losses | (1.0) | (1.8)
Twelve months or longer, Fair value | 126.5 | 164.0
Total, Gross unrealized losses | (1.0) | (1.9)
Total, Fair value | 142.8 | 233.6
Pre-refunded municipal bonds [Member] |  |
Securities in an unrealized loss position |  |
Less than twelve months, Gross unrealized losses | 0 | 0
Less than twelve months, Fair value | 1.7 | 1.7
Twelve months or longer, Gross unrealized losses | 0 | 0
Twelve months or longer, Fair value | 0 | 0
Total, Gross unrealized losses | 0 | 0
Total, Fair value | 1.7 | 1.7
Revenue municipal bonds [Member] |  |
Securities in an unrealized loss position |  |
Less than twelve months, Gross unrealized losses | 0 | 0
Less than twelve months, Fair value | 40.3 | 47.5
Twelve months or longer, Gross unrealized losses | (0.3) | (1.1)
Twelve months or longer, Fair value | 81.9 | 112.4
Total, Gross unrealized losses | (0.3) | (1.1)
Total, Fair value | $ 122.2 | $ 159.9

X
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- Definition Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Amount of the excess of amortized cost basis over fair value of securities in a loss position categorized as neither held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition Carrying amount as of the balance sheet date of the funds held on behalf of others and that are expected to be liquidated within one year or the normal operating cycle, if longer. This does not include funds held under reinsurance agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 2 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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