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Funds Held for Clients and Corporate Investments (Details) (USD $) In Millions | 12 Months Ended
--- | ---
May 31, 2011 | May 31, 2010
Type of issue: |  |
Money market securities and other cash equivalents, Amortized cost | $ 1,372.9 | $ 1,754.5
Money market securities and other cash equivalents, Fair value | 1,372.9 | 1,754.5
Available-for-sale securities: |  |
Amortized cost | 2,677.9 | 2,085.2
Gross unrealized gains | 59.4 | 67.0
Gross unrealized losses | (0.1) | (0.4)
Fair value | 2,737.2 | 2,151.8
Other, Amortized cost | 8.3 | 7.5
Other, Gross unrealized gains | 0.6 |
Other, Gross unrealized losses |  | (0.2)
Other, Fair value | 8.9 | 7.3
Total funds held for clients and corporate investments, Amortized cost | 4,059.1 | 3,847.2
Total funds held for clients and corporate investments, Gross unrealized gains | 60.0 | 67.0
Total funds held for clients and corporate investments, Gross unrealized losses | (0.1) | (0.6)
Total funds held for clients and corporate investments, fair value | 4,119.0 | 3,913.6
Securities in unrealized loss position |  |
Less than 12 months, Gross unrealized loss | (0.1) | (0.4)
Less than 12 months, Fair value | 51.7 | 73.6
More than 12 months, Gross unrealized loss | 0 |
More than 12 months, Fair value | 0 | 0
Total, Gross unrealized loss | (0.1) | (0.4)
Total, Fair value | 51.7 | 73.6
Classification of investments on the Consolidated Balance Sheets |  |
Funds held for clients | 3,566.7 | 3,541.0
Corporate investments | 345.0 | 82.5
Long-term corporate investments | 207.3 | 290.1
Total funds held for clients and corporate investments, fair value | 4,119.0 | 3,913.6
General obligation municipal bonds [Member] |  |
Available-for-sale securities: |  |
Amortized cost | 1,017.5 | 951.1
Gross unrealized gains | 33.1 | 33.7
Gross unrealized losses | (0.1) | (0.3)
Fair value | 1,050.5 | 984.5
Securities in unrealized loss position |  |
Less than 12 months, Gross unrealized loss | (0.1) | (0.3)
Less than 12 months, Fair value | 37.3 | 44.0
More than 12 months, Gross unrealized loss | 0 |
More than 12 months, Fair value | 0 | 0
Total, Gross unrealized loss | (0.1) | (0.3)
Total, Fair value | 37.3 | 44.0
Pre-refunded municipal bonds [Member] |  |
Available-for-sale securities: |  |
Amortized cost | 470.5 | 539.8
Gross unrealized gains | 14.2 | 19.5
Fair value | 484.7 | 559.3
Securities in unrealized loss position |  |
Less than 12 months, Fair value | 0 | 4.1
More than 12 months, Fair value | 0 | 0
Total, Fair value | 0 | 4.1
Revenue municipal bonds [Member] |  |
Available-for-sale securities: |  |
Amortized cost | 361.6 | 368.0
Gross unrealized gains | 12.1 | 13.8
Gross unrealized losses |  | (0.1)
Fair value | 373.7 | 381.7
Securities in unrealized loss position |  |
Less than 12 months, Gross unrealized loss |  | (0.1)
Less than 12 months, Fair value | 14.4 | 25.5
More than 12 months, Gross unrealized loss | 0 |
More than 12 months, Fair value | 0 | 0
Total, Gross unrealized loss |  | (0.1)
Total, Fair value | 14.4 | 25.5
Variable rate demand notes [Member] |  |
Available-for-sale securities: |  |
Amortized cost | 828.3 | 226.3
Fair value | $ 828.3 | $ 226.3

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b + Details
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