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Acquisitions - Summary of Fair Values of Acquired Intangible Assets (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Business Acquisition [Line Items] |  |
Funds receivable and funds held on behalf of clients | $ 1,394.0 | $ 2,079.1
Goodwill | 9,374.4 | $ 8,969.5
Battea Class Action Services [Member] |  |
Business Acquisition [Line Items] |  |
Accounts receivable | 42.9 |
Property, plant and equipment | 1.9 |
Other assets | 1.1 |
Funds receivable and funds held on behalf of clients | 284.8 |
Operating lease right-of-use assets | 1.2 |
Customer relationships | 246.6 |
Completed technologies | 121.8 |
Trade names | 7.8 |
Goodwill | 323.5 |
Accrued employee compensation and other liabilities | (67.2) |
Deferred income taxes | (33.8) |
Client funds obligations | (284.8) |
Consideration paid, net of cash acquired | $ 645.8 |

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