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Funds Held for Clients and Corporate Investments (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2014 Security | Feb. 28, 2013 | Feb. 28, 2014 Security | Feb. 28, 2013 | May 31, 2013 Security
Maturity Date: |  |  |  |  |
Due in one year or less, Amortized cost | $ 350.1 |  | $ 350.1 |  |
Due in one year or less, Fair value | 352.6 |  | 352.6 |  |
Due after one year through three years, Amortized cost | 769.8 |  | 769.8 |  |
Due after one year through three years, Fair value | 788.5 |  | 788.5 |  |
Due after three years through five years, Amortized cost | 703.7 |  | 703.7 |  |
Due after three years through five years, Fair value | 716.3 |  | 716.3 |  |
Due after five years, Amortized cost | 1,226.7 |  | 1,226.7 |  |
Due after five years, Fair value | 1,232.1 |  | 1,232.1 |  |
Total, Amortized cost | 3,050.3 |  | 3,050.3 |  |
Fair value | 3,089.5 |  | 3,089.5 |  | 3,691.4
Funds Held for Clients and Corporate Investments (Textual) |  |  |  |  |
Net unrealized gain on available-for-sale securities | 39.2 |  | 39.2 |  | 34.7
Number of available-for-sale securities in an unrealized loss position | 85 |  | 85 |  | 147
Gross realized gains | 0.3 | 0.6 | 0.5 | 0.9 |
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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