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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 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Investments [Line Items] |  |  |
Deferred compensation liabilities | [1] | $ (11.9) | $ (11.7)
Total |  | 1,622.9 | 2,250.1
Money Market Funds [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [2] | 1,585.6 | 2,212.6
Seed Capital Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [3] | 27.7 | 26.1
Marketable Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Investments measured at fair value | [3] | 21.5 | 23.1
Quoted prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Deferred compensation liabilities | [1] | (11.9) | (11.7)
Total |  | 1,622.9 | 2,250.1
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] | 1,585.6 | 2,212.6
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] | 27.7 | 26.1
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] | 21.5 | 23.1
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 September 30, 2024, included $189.1 million of cash and cash equivalents, $2.5 million of restricted cash and $1,394.0 million of funds receivable and funds held on behalf of clients on the Condensed Consolidated Balance Sheet. As of December 31, 2023, included $131.7 million of cash and cash equivalents, $1.8 million of restricted cash and $2,079.1 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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