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Funds Held for Clients and Corporate Investments (Details) (USD $) In Millions, unless otherwise specified | Nov. 30, 2013 | May 31, 2013
--- | --- | ---
Type of issue: |  |  |  |
Funds held for clients money market securities and other cash equivalents, Amortized cost | $ 1,695.1 |  | $ 1,137.7 |
Funds held for clients money market securities and other cash equivalents, Gross unrealized gains | 0 |  | 0 |
Funds held for clients money market securities and other cash equivalents, Gross unrealized losses | 0 |  | 0 |
Funds held for clients money market securities and other cash equivalents, Fair value | 1,695.1 |  | 1,137.7 |
Available-for-sale securities: |  |  |  |
Amortized cost | 2,809.0 |  | 3,656.7 |
Gross unrealized gains | 34.1 |  | 40.4 |
Gross unreailzed losses | (12.6) |  | (5.7) |
Fair value | 2,830.5 |  | 3,691.4 |
Other, Amortized cost | 10.8 |  | 9.5 |
Other, Gross unrealized gains | 1.9 |  | 1.2 |
Other, Gross unrealized losses | 0 |  | 0 |
Other, Fair value | 12.7 |  | 10.7 |
Total funds held for clients and corporate investments, Amortized cost | 4,514.9 |  | 4,803.9 |
Total funds held for clients and corporate investments, Gross unrealized gains | 36.0 |  | 41.6 |
Total funds held for clients and corporate investments, Gross unrealized losses | (12.6) |  | (5.7) |
Total funds held for clients and corporate investments, Fair value | 4,538.3 |  | 4,839.8 |
General obligation municipal bonds [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized cost | 1,640.1 |  | 1,432.9 |
Gross unrealized gains | 23.6 |  | 27.4 |
Gross unreailzed losses | (8.0) |  | (3.5) |
Fair value | 1,655.7 |  | 1,456.8 |
Pre-refunded municipal bonds [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized cost | 127.8 | [1] | 201.0 | [1]
Gross unrealized gains | 2.2 | [1] | 2.9 | [1]
Gross unreailzed losses | 0 | [1] | 0 | [1]
Fair value | 130.0 | [1] | 203.9 | [1]
Revenue municipal bonds [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized cost | 842.7 |  | 746.1 |
Gross unrealized gains | 8.3 |  | 10.1 |
Gross unreailzed losses | (4.6) |  | (2.2) |
Fair value | 846.4 |  | 754.0 |
Variable rate demand notes [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized cost | 198.4 |  | 1,276.7 |
Gross unrealized gains | 0 |  | 0 |
Gross unreailzed losses | 0 |  | 0 |
Fair value | $ 198.4 |  | $ 1,276.7 |
[1] | Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.

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