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Investments - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Investments [Line Items] |  |  |
Deferred compensation liabilities | [1] | $ (9.0) | $ (11.5)
Total |  | 3,872.3 | 2,670.7
Money Market Funds [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [2] | 3,839.8 | 2,637.5
Seed Capital Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [3] | 23.0 | 23.1
Marketable Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [3] | 18.5 | 21.6
Quoted prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Deferred compensation liabilities | [1] | (9.0) | (11.5)
Total |  | 3,872.3 | 2,670.7
Quoted prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [2] | 3,839.8 | 2,637.5
Quoted prices in Active Markets for Identical Assets (Level 1) [Member] | Seed Capital Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [3] | 23.0 | 23.1
Quoted prices in Active Markets for Identical Assets (Level 1) [Member] | Marketable Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [3] | 18.5 | 21.6
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Deferred compensation liabilities | [1] | 0.0 | 0.0
Total |  | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) [Member] | Money Market Funds [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [2] | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) [Member] | Seed Capital Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [3] | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) [Member] | Marketable Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [3] | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Deferred compensation liabilities | [1] | 0.0 | 0.0
Total |  |  | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Money Market Funds [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [2] | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Seed Capital Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [3] | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Marketable Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [3] | $ 0.0 | $ 0.0
[1] | Included in Other long-term liabilities on the Condensed Consolidated Balance Sheet
[2] | As of March 31, 2025, included $173.3 million of cash and cash equivalents, $1.0 million of restricted cash and $3,665.5 million of funds receivable and funds held on behalf of clients on the Condensed Consolidated Balance Sheet. As of December 31, 2024, included $184.2 million of cash and cash equivalents, $2.5 million of restricted cash and $2,450.8 million of funds receivable and funds held on behalf of clients on the Co ndensed Consolidated Balance Sheet.
[3] | Included in Investments on the Condensed Consolidated Balance Sheet

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- Definition Line items represent financial concepts included in a table. 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