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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