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Quarterly Financial Data (Unaudited) - Additional Disclosures (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2014 | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2014 | May 31, 2013 | May 31, 2012
Service revenue | $ 628.8 | $ 639.9 | $ 606.4 | $ 603.1 | $ 575.3 | $ 582.4 | $ 559.4 | $ 568.1 | $ 2,478.2 | $ 2,285.2 | $ 2,186.2
Total revenue | 639.0 | 650.4 | 616.4 | 613.1 | 585.3 | 593.3 | 569.4 | 578.2 | 2,518.9 | 2,326.2 | 2,229.8
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Service revenue |  | 626.0 | 600.5 | 597.9 |  |  |  |  |  |  |
Total revenue |  | $ 636.5 | $ 610.5 | $ 607.9 |  |  |  |  |  |  |
Settlement of State Income Tax Matter [Member] |  |  |  |  |  |  |  |  |  |  |
Impact to diluted earnings per share from settlement of state tax item |  |  |  |  |  |  |  |  |  | $ (0.04) |

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition The net-of-tax earnings per share amount of each material event or transaction (that would not reasonably be expected to recur in the foreseeable future) that possesses a high degree of abnormality and are clearly unrelated to, or incidentally related to, the ordinary and typical activities of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 20 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6904752&loc=d3e14736-107780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1311-109256 + Details
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