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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, 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
Quarterly Financial Data (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
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
Interest on funds held for clients | 10.2 | 10.5 | 10.0 | 10.0 | 10.0 | 10.9 | 10.0 | 10.1 | 40.7 | 41.0 | 43.6
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
Operating income | 228.3 | 250.7 | 248.6 | 255.1 | 211.8 | 225.0 | 230.0 | 238.0 | 982.7 | 904.8 | 853.9
Investment income, net | 1.4 | 1.5 | 1.3 | 1.2 | 1.4 | 1.4 | 1.9 | 1.9 | 5.4 | 6.6 | 6.4
Income before income taxes | 229.7 | 252.2 | 249.9 | 256.3 | 213.2 | 226.4 | 231.9 | 239.9 | 988.1 | 911.4 | 860.3
Income taxes | 83.8 | 92.1 | 91.2 | 93.5 | 89.7 | 81.9 | 84.0 | 86.8 | 360.6 | 342.4 | 312.3
Net income | 145.9 | 160.1 | 158.7 | 162.8 | 123.5 | 144.5 | 147.9 | 153.1 | 627.5 | 569.0 | 548.0
Basic earnings per share | $ 0.40 | $ 0.44 | $ 0.43 | $ 0.45 | $ 0.34 | $ 0.40 | $ 0.41 | $ 0.42 | $ 1.72 | $ 1.56 | $ 1.51
Diluted earnings per share | $ 0.40 | $ 0.44 | $ 0.43 | $ 0.44 | $ 0.34 | $ 0.40 | $ 0.41 | $ 0.42 | $ 1.71 | $ 1.56 | $ 1.51
Weighted-average common shares outstanding | 363.5 | 364.2 | 364.9 | 365.3 | 364.6 | 363.8 | 363.6 | 363.0 | 364.5 | 363.8 | 362.4
Weighted-average common shares outstanding, assuming dilution | 365.3 | 365.8 | 366.4 | 366.7 | 365.9 | 364.6 | 364.4 | 363.8 | 366.1 | 364.7 | 363.0
Cash dividends per common share | $ 0.35 | $ 0.35 | $ 0.35 | $ 0.35 | $ 0.00 | $ 0.66 | $ 0.33 | $ 0.32 | $ 1.40 | $ 1.31 | $ 1.27
Total net realized gains | $ 0.1 | $ 0.3 | $ 0 | $ 0.2 | $ 0 | $ 0.6 | $ 0.1 | $ 0.2 | $ 0.6 | $ 0.9 | $ 1.0

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