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Funds Held for Clients and Corporate Investments (Details) - USD ($) $ in Millions | Feb. 29, 2016 | May. 31, 2015
--- | --- | ---
Type of issue: |  |  |
Funds held for clients money market securities and other cash equivalents, Amortized cost |  | $ 2,222.9 | $ 1,430.0
Funds held for clients money market securities and other cash equivalents Gross unrealized gains |  | 0.0 | 0.0
Funds held for clients money market securities and other cash equivalents Gross unrealized losses |  | 0.0 | 0.0
Funds held for clients money market securities and other cash equivalents, Fair value |  | 2,222.9 | 1,430.0
Available-for-sale securities: |  |  |
Amortized cost |  | 2,922.2 | 3,582.0
Available-for-sale securities, Gross unrealized gain, before tax |  | 61.4 | 21.1
Available-for-sale securities, Gross unrealized loss, before tax |  | (0.4) | (7.5)
Fair value |  | 2,983.2 | 3,595.6
Other, Amortized cost |  | 13.9 | 12.7
Other, Gross unrealized gains |  | 0.5 | 1.5
Other, Gross unrealized losses |  | (0.6) | 0.0
Other, Fair value |  | 13.8 | 14.2
Total funds held for clients and corporate investments, Amortized cost |  | 5,159.0 | 5,024.7
Funds held for clients and corporate investments Gross unrealized gains |  | 61.9 | 22.6
Funds held for clients and corporate investments Gross unrealized losses |  | (1.0) | (7.5)
Total funds held for clients and corporate investments, Fair value |  | 5,219.9 | 5,039.8
Corporate bonds [Member] |  |  |
Available-for-sale securities: |  |  |
Amortized cost |  | 108.9 |
Available-for-sale securities, Gross unrealized gain, before tax |  | 1.7 |
Available-for-sale securities, Gross unrealized loss, before tax |  | (0.2) |
Fair value |  | 110.4 |
General obligation municipal bonds [Member] |  |  |
Available-for-sale securities: |  |  |
Amortized cost |  | 1,626.3 | 1,694.0
Available-for-sale securities, Gross unrealized gain, before tax |  | 36.4 | 14.0
Available-for-sale securities, Gross unrealized loss, before tax |  | (0.1) | (4.3)
Fair value |  | 1,662.6 | 1,703.7
Pre-refunded municipal bonds [Member] |  |  |
Available-for-sale securities: |  |  |
Amortized cost | [1] | 67.9 | 101.7
Available-for-sale securities, Gross unrealized gain, before tax | [1] | 1.8 | 1.0
Available-for-sale securities, Gross unrealized loss, before tax | [1] | 0.0 | 0.0
Fair value | [1] | 69.7 | 102.7
Revenue municipal bonds [Member] |  |  |
Available-for-sale securities: |  |  |
Amortized cost |  | 930.6 | 960.7
Available-for-sale securities, Gross unrealized gain, before tax |  | 20.8 | 6.1
Available-for-sale securities, Gross unrealized loss, before tax |  | (0.1) | (3.2)
Fair value |  | 951.3 | 963.6
U.S. government agency securities [Member] |  |  |
Available-for-sale securities: |  |  |
Amortized cost |  | 120.5 |
Available-for-sale securities, Gross unrealized gain, before tax |  | 0.7 |
Available-for-sale securities, Gross unrealized loss, before tax |  | 0.0 |
Fair value |  | 121.2 |
Variable rate demand notes [Member] |  |  |
Available-for-sale securities: |  |  |
Amortized cost |  | 68.0 | 825.6
Available-for-sale securities, Gross unrealized gain, before tax |  | 0.0 | 0.0
Available-for-sale securities, Gross unrealized loss, before tax |  | 0.0 | 0.0
Fair value |  | $ 68.0 | $ 825.6
[1] | Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.

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