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Funds Held for Clients and Corporate Investments (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2013 Security | Nov. 30, 2012 | Nov. 30, 2013 Security | Nov. 30, 2012 | May 31, 2013 Security
Maturity Date: |  |  |  |  |
Due in one year or less, Amortized cost | $ 337.4 |  | $ 337.4 |  |
Due in one year or less, Fair value | 340.2 |  | 340.2 |  |
Due after one year through three years, Amortized cost | 742.1 |  | 742.1 |  |
Due after one year through three years, Fair value | 760.2 |  | 760.2 |  |
Due after three years through five years, Amortized cost | 736.7 |  | 736.7 |  |
Due after three years through five years, Fair value | 745.9 |  | 745.9 |  |
Due after five years, Amortized cost | 992.8 |  | 992.8 |  |
Due after five years, Fair value | 984.2 |  | 984.2 |  |
Total, Amortized cost | 2,809.0 |  | 2,809.0 |  |
Fair value | 2,830.5 |  | 2,830.5 |  | 3,691.4
Funds Held for Clients and Corporate Investments (Textual) |  |  |  |  |
Net unrealized gain on available-for-sale securities | 21.5 |  | 21.5 |  | 34.7
Number of available-for-sale securities in an unrealized loss position | 192 |  | 192 |  | 147
Gross realized gains | 0 | 0.1 | 0.2 | 0.3 |
Gross realized losses | $ 0 | $ 0 | $ 0 | $ 0 |
Minimum maturity period for VRDNs primarily categorized as due after five years (in years) | 20 years |  | 20 years |  |
Maximum maturity period for VRDNs, primarily categorized as due after five years (in years) | 30 years |  | 30 years |  |

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