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Business Acquisitions - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 15, 2025
Mar. 31, 2025
Mar. 31, 2024
Mar. 13, 2025
Dec. 31, 2024
Business Acquisition [Line Items]          
Business acquisition, initial cash payment   $ 19.6 $ 11.6    
Contingent consideration on purchase price   18.5     $ 10.7
Goodwill   601.8     $ 573.8
Acquisition costs incurred   3.7 $ 0.3    
Insurtech Insights [Member]          
Business Acquisition [Line Items]          
Purchase price $ 25.2        
Business acquisition, initial cash payment 19.6        
Cash acquired from business acquisition 0.7        
Goodwill       $ 27.3  
Revenues   4.6      
Net income   1.7      
Intangible assets       $ 4.4  
Insurtech Insights [Member] | Selling, General and Administrative Expenses [Member]          
Business Acquisition [Line Items]          
Acquisition costs incurred 1.2        
Insurtech Insights [Member] | Trade Names [Member]          
Business Acquisition [Line Items]          
Intangible assets $ 2.5        
Weighted-average amortization period 10 years        
Assumed residual value $ 0.0        
Insurtech Insights [Member] | Customer Relationship Intangibles [Member]          
Business Acquisition [Line Items]          
Intangible assets $ 1.9        
Weighted-average amortization period 2 years        
Assumed residual value $ 0.0        
Insurtech Insights [Member] | Estimated Fair Value [Member]          
Business Acquisition [Line Items]          
Contingent consideration on purchase price $ 4.8 $ 4.8