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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | May 31, 2016 | May 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | $ (0.5) | $ (7.0)
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (0.2) | (0.5)
Total, Gross unrealized losses | (0.7) | (7.5)
Securities in an unrealized loss position for less than twelve months, Fair value | 141.1 | 896.7
Securities in an unrealized loss position for more than twelve months, Fair value | 14.5 | 26.3
Total, Fair value | 155.6 | 923.0
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | (0.1) |
Total, Gross unrealized losses | (0.1) |
Securities in an unrealized loss position for less than twelve months, Fair value | 14.7 |
Total, Fair value | 14.7 |
General Obligation Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | (0.1) | (3.8)
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses |  | (0.5)
Total, Gross unrealized losses | (0.1) | (4.3)
Securities in an unrealized loss position for less than twelve months, Fair value | 48.9 | 535.1
Securities in an unrealized loss position for more than twelve months, Fair value | 2.8 | 26.3
Total, Fair value | 51.7 | 561.4
Pre-Refunded Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Fair value | 5.7 |
Total, Fair value | 5.7 |
Revenue Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses |  | (3.2)
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (0.2) |
Total, Gross unrealized losses | (0.2) | (3.2)
Securities in an unrealized loss position for less than twelve months, Fair value | 20.7 | 361.6
Securities in an unrealized loss position for more than twelve months, Fair value | 11.7 |
Total, Fair value | 32.4 | $ 361.6
U.S. Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | (0.3) |
Total, Gross unrealized losses | (0.3) |
Securities in an unrealized loss position for less than twelve months, Fair value | 51.1 |
Total, Fair value | $ 51.1 |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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