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Funds Held for Clients and Corporate Investments (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2014 Security | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May 31, 2013 Security | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2014 Security | May 31, 2013 Security | May 31, 2012
Funds Held for Clients and Corporate Investments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  |  |  |  |  |  |  | $ 0.6 | $ 0.9 | $ 1.0
Gross realized losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net realized gains | 0.1 | 0.3 | 0 | 0.2 | 0 | 0.6 | 0.1 | 0.2 | 0.6 | 0.9 | 1.0
Maturity Date: |  |  |  |  |  |  |  |  |  |  |
Due in one year or less, Amortized cost | 392.0 |  |  |  |  |  |  |  | 392.0 |  |
Due in one year or less, Fair value | 394.3 |  |  |  |  |  |  |  | 394.3 |  |
Due after one year through three years, Amortized cost | 759.8 |  |  |  |  |  |  |  | 759.8 |  |
Due after one year through three years, Fair value | 776.0 |  |  |  |  |  |  |  | 776.0 |  |
Due after three years through five years, Amortized cost | 764.1 |  |  |  |  |  |  |  | 764.1 |  |
Due after three years through five years, Fair value | 774.3 |  |  |  |  |  |  |  | 774.3 |  |
Due after five years, Amortized cost | 1,441.0 |  |  |  |  |  |  |  | 1,441.0 |  |
Due after five years, Fair value | 1,446.8 |  |  |  |  |  |  |  | 1,446.8 |  |
Total, Amortized cost | 3,356.9 |  |  |  |  |  |  |  | 3,356.9 |  |
Fair value | 3,391.4 |  |  |  | 3,691.4 |  |  |  | 3,391.4 | 3,691.4 |
Funds Held for Clients and Corporate Investments (Textual) |  |  |  |  |  |  |  |  |  |  |
Net unrealized gain on available-for-sale securities | 34.5 |  |  |  | 34.7 |  |  |  | 34.5 | 34.7 |
Number of available-for-sale securities in an unrealized loss position | 98 |  |  |  | 147 |  |  |  | 98 | 147 |
Minimum maturity period for VRDNs primarily categorized as due after five years (in years) |  |  |  |  |  |  |  |  | 20 years |  |
Maximum maturity period for VRDNs primarily categorized as due after five years (in years) |  |  |  |  |  |  |  |  | 30 years |  |
Total, Gross unrealized losses | $ 3.0 |  |  |  | $ 5.7 |  |  |  | $ 3.0 | $ 5.7 |

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- Definition Amount of available-for-sale debt securities at fair value maturing after the fifth rolling twelve months following the latest balance sheet presented. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at cost maturing in the third rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at fair value maturing in the third rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at cost maturing in the second rolling twelve months through the third rolling twelve months following the balance sheet date presented. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References No definition available. + Details
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