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Funds Held for Clients and Corporate Investments (Details 1) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
May 31, 2011 | May 31, 2010 | May 31, 2009
Realized gains and losses on the sales of available-for-sale securities |  |  |
Gross realized gains | $ 1.3 | $ 3.2 | $ 1.2
Gross realized losses |  |  | (0.1)
Net realized gains | 1.3 | 3.2 | 1.1
Maturity Date: |  |  |
Due in one year or less, Amortized cost | 408.7 |  |
Due in one year or less, Fair value | 412.3 |  |
Due after one year through three years, Amortized cost | 603.0 |  |
Due after one year through three years, Fair value | 626.9 |  |
Due after three years through five years, Amortized cost | 570.8 |  |
Due after three years through five years, Fair value | 592.7 |  |
Due after five years, Amortized cost | 1,095.4 |  |
Due after five years, Fair value | 1,105.3 |  |
Total, Amortized cost | 2,677.9 |  |
Total, Fair value | 2,737.2 |  |
Funds Held for Clients and Corporate Investments (Textuals) [Abstract] |  |  |
Net unrealized gain on available-for-sale securities | 59.3 | 66.6 |
Number of available-for-sale securities in an unrealized loss position | 15 | 23 |
Available-for-sale securities having fair value lower than amortized cost | 51.7 | 73.6 |
Gross unrealized losses | $ 0.1 | $ 0.4 |
Minimum maturity period for VRDNs, primarily categorized as due after five years (in years) | 20 years |  |
Maximum maturity period for VRDNs, primarily categorized as due after five years (in years) | 30 years |  |

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 + Details
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