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Funds Held for Clients and Corporate Investments (Funds Held for Clients and Corporate Investments) (Details) - USD ($) $ in Millions | May 31, 2016 | May 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Funds held for clients money market securities and other cash equivalents, Amortized cost |  | $ 502.4 | $ 1,430.0
Funds held for clients money market securities and other cash equivalents, Gross unrealized gains |  |  |
Funds held for clients money market securities and other cash equivalents, Gross unrealized losses |  |  |
Funds held for clients money market securities and other cash equivalents, Fair value |  | 502.4 | 1,430.0
Available-for-sale securities, Amortized cost |  | 4,094.3 | 3,582.0
Available-for-sale securities, Gross unrealized gains |  | 48.3 | 21.1
Available-for-sale securities, Gross unrealized losses |  | (0.7) | (7.5)
Available-for-sale securities, Fair value |  | 4,141.9 | 3,595.6
Other, Amortized cost |  | 14.2 | 12.7
Other, Gross unrealized gains |  | 0.8 | 1.5
Other, Gross unrealized losses |  | (0.1) |
Other, Fair value |  | 14.9 | 14.2
Total funds held for clients and corporate investments, Amortized cost |  | 4,610.9 | 5,024.7
Total funds held for clients and corporate investments, Gross unrealized gains |  | 49.1 | 22.6
Total funds held for clients and corporate investments, Gross unrealized losses |  | (0.8) | (7.5)
Total funds held for clients and corporate investments, Fair value |  | 4,659.2 | 5,039.8
Corporate Bonds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Amortized cost |  | 128.4 |
Available-for-sale securities, Gross unrealized gains |  | 2.9 |
Available-for-sale securities, Gross unrealized losses |  | (0.1) |
Available-for-sale securities, Fair value |  | 131.2 |
General Obligation Municipal Bonds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Amortized cost |  | 1,594.1 | 1,694.0
Available-for-sale securities, Gross unrealized gains |  | 27.6 | 14.0
Available-for-sale securities, Gross unrealized losses |  | (0.1) | (4.3)
Available-for-sale securities, Fair value |  | 1,621.6 | 1,703.7
Pre-Refunded Municipal Bonds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Amortized cost | [1] | 60.2 | 101.7
Available-for-sale securities, Gross unrealized gains | [1] | 1.4 | 1.0
Available-for-sale securities, Gross unrealized losses | [1] |  |
Available-for-sale securities, Fair value | [1] | 61.6 | 102.7
Revenue Municipal Bonds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Amortized cost |  | 916.2 | 960.7
Available-for-sale securities, Gross unrealized gains |  | 15.8 | 6.1
Available-for-sale securities, Gross unrealized losses |  | (0.2) | (3.2)
Available-for-sale securities, Fair value |  | 931.8 | 963.6
U.S. Government Agency Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Amortized cost |  | 160.8 |
Available-for-sale securities, Gross unrealized gains |  | 0.6 |
Available-for-sale securities, Gross unrealized losses |  | (0.3) |
Available-for-sale securities, Fair value |  | 161.1 |
Variable Rate Demand Notes [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Amortized cost |  | 1,234.6 | 825.6
Available-for-sale securities, Gross unrealized gains |  |  |
Available-for-sale securities, Gross unrealized losses |  |  |
Available-for-sale securities, Fair value |  | $ 1,234.6 | $ 825.6
[1] | Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.

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