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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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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May 31, 2014
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Feb. 28, 2014
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Nov. 30, 2013
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Aug. 31, 2013
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May 31, 2013
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Feb. 28, 2013
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Nov. 30, 2012
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Aug. 31, 2012
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May 31, 2014
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May 31, 2013
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May 31, 2012
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| 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 |
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Scenario, Previously Reported [Member]
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| Service revenue | 626.0 | 600.5 | 597.9 | ||||||||
| Total revenue | $ 636.5 | $ 610.5 | $ 607.9 | ||||||||
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Settlement of State Income Tax Matter [Member]
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| Impact to diluted earnings per share from settlement of state tax item | $ (0.04) | ||||||||||