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Acquisitions - Summary of Allocation of Purchase Price for Acquisitions of Acquiree (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Business Acquisition [Line Items]      
Funds receivable and funds held on behalf of clients $ 2,681.3 $ 2,450.8  
Goodwill 9,991.3 $ 9,218.1 $ 8,969.5
Battea      
Business Acquisition [Line Items]      
Accounts receivable 40.3    
Property, plant and equipment 1.9    
Other assets 3.0    
Funds receivable and funds held on behalf of clients 284.8    
Operating lease right-of-use assets 1.2    
Goodwill 325.7    
Accounts payable 0.0    
Accrued employee compensation and other liabilities (68.8)    
Deferred income taxes (33.9)    
Client Funds Obligations (284.8)    
Consideration paid, net of cash acquired 645.6    
Calastone      
Business Acquisition [Line Items]      
Accounts receivable 19.8    
Property, plant and equipment 0.6    
Other assets 7.0    
Funds receivable and funds held on behalf of clients 0.0    
Operating lease right-of-use assets 0.0    
Goodwill 577.6    
Accounts payable (2.6)    
Accrued employee compensation and other liabilities (9.5)    
Deferred revenue (0.6)    
Deferred income taxes (120.6)    
Client Funds Obligations 0.0    
Consideration paid, net of cash acquired 1,031.4    
Customer relationships | Battea      
Business Acquisition [Line Items]      
Intangible assets acquired 246.6    
Customer relationships | Calastone      
Business Acquisition [Line Items]      
Intangible assets acquired 435.8    
Completed Technology | Battea      
Business Acquisition [Line Items]      
Intangible assets acquired 121.8    
Completed Technology | Calastone      
Business Acquisition [Line Items]      
Intangible assets acquired 109.2    
Trade Names | Battea      
Business Acquisition [Line Items]      
Intangible assets acquired 7.8    
Trade Names | Calastone      
Business Acquisition [Line Items]      
Intangible assets acquired $ 14.7