Segment Reporting - Schedule of Company 's Revenues Expenses and Net Income for Each Reportable Segment Consistant with Amounts Reported On Consolidated Statements of Comprehensive Income (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Revenues | ||||
| Total revenues | $ 531.2 | $ 483.6 | $ 1,103.1 | $ 1,014.1 |
| Cost of revenues | ||||
| Operating expenses | 64.6 | 68.4 | 127.5 | 134.8 |
| Depreciation and amortization | 24.5 | 19.1 | 48.9 | 37.4 |
| Total cost of revenues | 89.1 | 87.5 | 176.4 | 172.2 |
| Gross profit | 442.1 | 396.1 | 926.6 | 841.9 |
| Administrative expenses | ||||
| Sales and marketing | 118.8 | 116.0 | 236.4 | 226.9 |
| Research and development | 51.9 | 74.8 | 112.6 | 137.1 |
| General and administrative | 77.3 | 70.2 | 146.6 | 135.9 |
| Depreciation and amortization | 25.6 | 22.8 | 52.3 | 44.5 |
| Total administrative expenses | 273.6 | 283.8 | 547.9 | 544.4 |
| Total operating expenses | 362.7 | 371.3 | 724.4 | 716.6 |
| Operating income | 168.5 | 112.3 | 378.7 | 297.5 |
| Interest expense | (10.5) | (0.8) | (14.5) | (1.6) |
| Other income (expense), net | (1.1) | 5.7 | 8.0 | 11.6 |
| Income before income taxes | 156.9 | 117.2 | 372.1 | 307.5 |
| Provision for income taxes | 49.5 | 27.7 | 109.0 | 78.6 |
| Net income | 107.4 | 89.5 | 263.1 | 228.9 |
| Recurring [Member] | ||||
| Revenues | ||||
| Total revenues | 497.9 | 449.1 | 1,035.2 | 942.5 |
| Implementation and Other [Member] | ||||
| Revenues | ||||
| Total revenues | 7.3 | 6.0 | 14.0 | 12.6 |
| Interest on Funds Held for Clients [Member] | ||||
| Revenues | ||||
| Total revenues | $ 26.0 | $ 28.5 | $ 53.9 | $ 59.0 |
| X | ||||||||||
- Definition Amount of expense for allocation of cost of tangible and intangible assets over their useful lives directly used in production of good and rendering of service. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Total costs of sales and operating expenses for the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The aggregate direct operating costs incurred during the reporting period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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://www.xbrl.org/2003/role/exampleRef
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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/exampleRef
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- Definition Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The net result for the period of deducting operating expenses from operating revenues. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of income (expense) related to nonoperating activities, classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of expense for research and development. Includes, but is not limited to, cost for computer software product to be sold, leased, or otherwise marketed and writeoff of research and development assets acquired in transaction other than business combination or joint venture formation or both. Excludes write-down of intangible asset acquired in business combination or from joint venture formation or both, used in research and development activity. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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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://www.xbrl.org/2003/role/exampleRef
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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://www.xbrl.org/2003/role/exampleRef
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- References No definition available.
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