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Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2011 | Aug. 31, 2011 | May 31, 2013 | May 31, 2012 | May 31, 2011
Quarterly Financial Data (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Service revenue | $ 575.3 | $ 582.4 | $ 559.4 | $ 568.1 | $ 540.7 | $ 558.5 | $ 535.0 | $ 552.0 | $ 2,285.2 | $ 2,186.2 | $ 2,036.2
Interest on funds held for clients | 10.0 | 10.9 | 10.0 | 10.1 | 10.8 | 11.0 | 10.7 | 11.1 | 41.0 | 43.6 | 48.1
Total revenue | 585.3 | 593.3 | 569.4 | 578.2 | 551.5 | 569.5 | 545.7 | 563.1 | 2,326.2 | 2,229.8 | 2,084.3
Operating income | 211.8 | 225.0 | 230.0 | 238.0 | 195.9 | 210.4 | 217.9 | 229.7 | 904.8 | 853.9 | 786.4
Investment income, net | 1.4 | 1.4 | 1.9 | 1.9 | 1.8 | 1.6 | 1.5 | 1.5 | 6.6 | 6.4 | 5.8
Income before income taxes | 213.2 | 226.4 | 231.9 | 239.9 | 197.7 | 212.0 | 219.4 | 231.2 | 911.4 | 860.3 | 792.2
Income taxes | 89.7 | 81.9 | 84.0 | 86.8 | 74.4 | 76.6 | 79.0 | 82.3 | 342.4 | 312.3 | 276.9
Net income | 123.5 | 144.5 | 147.9 | 153.1 | 123.3 | 135.4 | 140.4 | 148.9 | 569.0 | 548.0 | 515.3
Basic earnings per share | $ 0.34 | $ 0.40 | $ 0.41 | $ 0.42 | $ 0.34 | $ 0.37 | $ 0.39 | $ 0.41 | $ 1.56 | $ 1.51 | $ 1.42
Diluted earnings per share | $ 0.34 | $ 0.40 | $ 0.41 | $ 0.42 | $ 0.34 | $ 0.37 | $ 0.39 | $ 0.41 | $ 1.56 | $ 1.51 | $ 1.42
Weighted-average common shares outstanding | 364.6 | 363.8 | 363.6 | 363.0 | 362.6 | 362.5 | 362.4 | 362.2 | 363.8 | 362.4 | 361.8
Weighted-average common shares outstanding, assuming dilution | 365.9 | 364.6 | 364.4 | 363.8 | 363.4 | 363.1 | 362.8 | 362.8 | 364.7 | 363.0 | 362.4
Cash dividends per common share | $ 0.00 | $ 0.66 | $ 0.33 | $ 0.32 | $ 0.32 | $ 0.32 | $ 0.32 | $ 0.31 | $ 1.31 | $ 1.27 | $ 1.24
Total net realized gains | $ 0 | $ 0.6 | $ 0.1 | $ 0.2 | $ 0.4 | $ 0.4 | $ 0.1 | $ 0.1 | $ 0.9 | $ 1.0 | $ 1.3

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