Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Millions, $ in Millions |
12 Months Ended | |||||||||||||||||||||
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May 31, 2019 |
May 31, 2018 |
[2] | May 31, 2017 |
[2] | ||||||||||||||||||
| Revenue: | ||||||||||||||||||||||
| Total service revenue | $ 3,691.9 | $ 3,314.2 | [1] | $ 3,102.4 | [3] | |||||||||||||||||
| Interest on funds held for clients | 80.6 | 63.5 | [1] | 50.6 | ||||||||||||||||||
| Total revenue | 3,772.5 | 3,377.7 | [1] | 3,153.0 | ||||||||||||||||||
| Expenses: | ||||||||||||||||||||||
| Operating expenses | 1,177.8 | 1,018.2 | 919.4 | |||||||||||||||||||
| Selling, general and administrative expenses | 1,223.4 | 1,068.0 | 979.7 | |||||||||||||||||||
| Total expenses | 2,401.2 | 2,086.2 | 1,899.1 | |||||||||||||||||||
| Operating income | 1,371.3 | 1,291.5 | [1] | 1,253.9 | ||||||||||||||||||
| Interest (expense)/income, net | (3.3) | 8.6 | [1] | 5.2 | ||||||||||||||||||
| Income before income taxes | 1,368.0 | 1,300.1 | [1] | 1,259.1 | ||||||||||||||||||
| Income taxes | 333.6 | 306.0 | [1],[4] | 432.8 | [5] | |||||||||||||||||
| Net income | 1,034.4 | 994.1 | [1],[6] | 826.3 | [3],[6] | |||||||||||||||||
| Other comprehensive income/(loss), net of tax | 36.3 | (56.2) | (9.2) | |||||||||||||||||||
| Comprehensive income | $ 1,070.7 | $ 937.9 | $ 817.1 | |||||||||||||||||||
| Basic earnings per share | $ 2.88 | [7] | $ 2.77 | [1],[7] | $ 2.30 | [3] | ||||||||||||||||
| Diluted earnings per share | $ 2.86 | [7] | $ 2.75 | [1],[7] | $ 2.28 | [3],[8] | ||||||||||||||||
| Weighted-average common shares outstanding | 359.2 | 359.0 | [1] | 359.8 | [3] | |||||||||||||||||
| Weighted-average common shares outstanding, assuming dilution | 361.8 | 361.5 | [1] | 362.6 | [3] | |||||||||||||||||
| Management Solutions [Member] | ||||||||||||||||||||||
| Revenue: | ||||||||||||||||||||||
| Total service revenue | $ 2,877.7 | $ 2,758.4 | [3] | $ 2,680.7 | [3] | |||||||||||||||||
| PEO And Insurance Services [Member] | ||||||||||||||||||||||
| Revenue: | ||||||||||||||||||||||
| Total service revenue | $ 814.2 | $ 555.8 | [3] | $ 421.7 | [3] | |||||||||||||||||
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The net amount of nonoperating interest income (expense). No definition available.
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- Definition Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense. No definition available.
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- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. No definition available.
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- References No definition available.
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- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- 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). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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