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Acquisitions - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Oct. 14, 2025
Sep. 27, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Nov. 30, 2025
Feb. 28, 2025
Business Acquisition [Line Items]              
Acquisition cost           $ 16.0 $ 6.0
Total revenues     $ 6,272.2 $ 5,882.0 $ 5,502.8    
Calastone              
Business Acquisition [Line Items]              
Consideration paid, net of cash plus the costs of transaction $ 1,030.0            
Total revenues     $ 28.6        
Calastone | Completed Technology              
Business Acquisition [Line Items]              
Amortized period 9 years            
Calastone | Customer Relationships [Member]              
Business Acquisition [Line Items]              
Amortized period 20 years            
Calastone | Trade Names              
Business Acquisition [Line Items]              
Amortized period 11 years            
Battea Class Action Services [Member]              
Business Acquisition [Line Items]              
Outstanding stock purchased   $ 671.0          
Total revenues       $ 21.1      
Battea Class Action Services [Member] | Completed Technology              
Business Acquisition [Line Items]              
Amortized period   10 years          
Battea Class Action Services [Member] | Customer Relationships [Member]              
Business Acquisition [Line Items]              
Amortized period   13 years          
Battea Class Action Services [Member] | Trade Names              
Business Acquisition [Line Items]              
Amortized period   13 years