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Quarterly Financial Data | 12 Months Ended
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May 31, 2016
Quarterly Financial Data [Abstract] |
Quarterly Financial Data | Note P — Quarterly Financial Data (Unaudited) In millions, except per share amounts ﻿ ﻿
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Three Months Ended |  |  |
﻿Fiscal 2016 |  | August 31 |  | November 30 |  | February 29 |  | May 31 |  | Full Year
﻿Service revenue |  | $ | 712.2 |  | $ | 711.3 |  | $ | 740.7 |  | $ | 741.6 |  | $ | 2,905.8
﻿Interest on funds held for clients |  |  | 10.8 |  |  | 11.1 |  |  | 11.9 |  |  | 12.3 |  |  | 46.1
﻿Total revenue |  | $ | 723.0 |  | $ | 722.4 |  | $ | 752.6 |  | $ | 753.9 |  | $ | 2,951.9
﻿Operating income |  | $ | 296.1 |  | $ | 294.2 |  | $ | 280.0 |  | $ | 276.3 |  | $ | 1,146.6
﻿Investment income/(loss), net |  |  | 1.4 |  |  | 1.6 |  |  | 1.7 |  |  | (0.2) |  |  | 4.5
﻿Income before income taxes |  |  | 297.5 |  |  | 295.8 |  |  | 281.7 |  |  | 276.1 |  |  | 1,151.1
﻿Income taxes |  |  | 88.4 |  |  | 106.6 |  |  | 101.3 |  |  | 98.0 |  |  | 394.3
﻿Net income |  | $ | 209.1 |  | $ | 189.2 |  | $ | 180.4 |  | $ | 178.1 |  | $ | 756.8
﻿Basic earnings per share(1) |  | $ | 0.58 |  | $ | 0.52 |  | $ | 0.50 |  | $ | 0.49 |  | $ | 2.10
﻿Diluted earnings per share(1) |  | $ | 0.58 |  | $ | 0.52 |  | $ | 0.50 |  | $ | 0.49 |  | $ | 2.09
﻿Weighted-average common shares outstanding |  |  | 361.1 |  |  | 360.7 |  |  | 360.5 |  |  | 360.3 |  |  | 360.7
﻿Weighted-average common shares outstanding, assuming dilution |  |  | 362.8 |  |  | 362.3 |  |  | 362.2 |  |  | 360.7 |  |  | 362.5
﻿Cash dividends per common share |  | $ | 0.42 |  | $ | 0.42 |  | $ | 0.42 |  | $ | 0.42 |  | $ | 1.68
﻿Total net realized gains(2) |  | $ | — |  | $ | — |  | $ | 0.1 |  | $ | — |  | $ | 0.1
﻿ ﻿
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﻿ |  | Three Months Ended |  |  |
﻿Fiscal 2015 |  | August 31 |  | November 30 |  | February 28 |  | May 31 |  | Full Year
﻿Service revenue |  | $ | 656.6 |  | $ | 665.9 |  | $ | 693.6 |  | $ | 681.4 |  | $ | 2,697.5
﻿Interest on funds held for clients |  |  | 10.2 |  |  | 10.4 |  |  | 10.7 |  |  | 10.8 |  |  | 42.1
﻿Total revenue |  | $ | 666.8 |  | $ | 676.3 |  | $ | 704.3 |  | $ | 692.2 |  | $ | 2,739.6
﻿Operating income |  | $ | 267.5 |  | $ | 270.2 |  | $ | 264.3 |  | $ | 251.6 |  | $ | 1,053.6
﻿Investment income, net |  |  | 1.4 |  |  | 1.4 |  |  | 1.6 |  |  | 2.0 |  |  | 6.4
﻿Income before income taxes |  |  | 268.9 |  |  | 271.6 |  |  | 265.9 |  |  | 253.6 |  |  | 1,060.0
﻿Income taxes |  |  | 97.6 |  |  | 98.6 |  |  | 96.5 |  |  | 92.4 |  |  | 385.1
﻿Net income |  | $ | 171.3 |  | $ | 173.0 |  | $ | 169.4 |  | $ | 161.2 |  | $ | 674.9
﻿Basic earnings per share(1) |  | $ | 0.47 |  | $ | 0.48 |  | $ | 0.47 |  | $ | 0.44 |  | $ | 1.86
﻿Diluted earnings per share(1) |  | $ | 0.47 |  | $ | 0.47 |  | $ | 0.46 |  | $ | 0.44 |  | $ | 1.85
﻿Weighted-average common shares outstanding |  |  | 363.1 |  |  | 363.0 |  |  | 363.2 |  |  | 362.3 |  |  | 362.9
﻿Weighted-average common shares outstanding, assuming dilution |  |  | 364.7 |  |  | 364.6 |  |  | 365.0 |  |  | 364.5 |  |  | 364.6
﻿Cash dividends per common share |  | $ | 0.38 |  | $ | 0.38 |  | $ | 0.38 |  | $ | 0.38 |  | $ | 1.52
﻿Total net realized gains(2) |  | $ | 0.1 |  | $ | 0.1 |  | $ | — |  | $ | 0.1 |  | $ | 0.3
﻿
| (1) |  | Each quarter is a discrete period and the sum of the four quarters’ basic and diluted earnings per share amounts may not equal the full year amount.
| (2) |  | Total net realized gains on the combined funds held for clients and corporate investment portfolios.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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