Quarterly report pursuant to Section 13 or 15(d)

Mergers and Acquisitions - Narrative (Details)

v3.24.3
Mergers and Acquisitions - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 13, 2024
USD ($)
program
Sep. 01, 2024
USD ($)
Aug. 30, 2024
USD ($)
May 01, 2024
USD ($)
Dec. 01, 2023
USD ($)
Jul. 03, 2023
USD ($)
Jul. 01, 2023
USD ($)
Jan. 03, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Business Acquisition [Line Items]                        
Estimated tax deductible goodwill                 $ 545,600   $ 545,600  
Acquisition related costs                 5,300   11,400  
Revenue of acquiree since acquisition date                 24,500   33,800  
Contingent consideration                 (365) $ 1,848 813 $ 4,358
Incremental amortization expense on intangible assets acquired                 12,500 28,300 61,400 89,500
Increase (decrease) in transaction costs                 (5,300)   (16,200) 7,700
Increase (decrease) in financing costs and interest expense                 (23,900) 11,000   63,000
Decrease in income tax expense                   20,700    
Incremental tax expenses                 8,900 $ 4,000 3,300 $ 19,700
Contingent consideration obligation, maximum                 483,100   483,100  
Contingently returnable consideration, maximum                 20,100   20,100  
2024 Acquisitions                        
Business Acquisition [Line Items]                        
Contingently returnable consideration                     4,900  
Contingent consideration liabilities                 $ 103,800   103,800  
Castel Underwriting Agencies Limited                        
Business Acquisition [Line Items]                        
Cash consideration for acquisition       $ 247,600                
Contingently returnable consideration       4,900                
Castel Underwriting Agencies Limited | Class A Common Stock                        
Business Acquisition [Line Items]                        
Equity consideration for acquisition       $ 2,200                
US Assure Insurance Services of Florida, Inc.                        
Business Acquisition [Line Items]                        
Cash consideration for acquisition     $ 1,079,800                  
Contingent consideration liabilities     $ 103,800                  
Greenhill Underwriting Insurance Services, LLC                        
Business Acquisition [Line Items]                        
Cash consideration for acquisition   $ 11,700                    
Ethos Property And Casualty Managing General Underwriters                        
Business Acquisition [Line Items]                        
Cash consideration for acquisition $ 44,000                      
Underwriting programs for insurance carriers (in programs) | program 8                      
Griffin Underwriting Services                        
Business Acquisition [Line Items]                        
Cash consideration for acquisition               $ 115,500        
ACE Benefit Partners & Point6 Healthcare                        
Business Acquisition [Line Items]                        
Cash consideration for acquisition             $ 46,800          
Contingent consideration             $ 2,300          
Measurement period adjustment to goodwill                     600  
Socius Insurance Services Inc                        
Business Acquisition [Line Items]                        
Cash consideration for acquisition           $ 253,500            
Contingent consideration           5,800            
Socius Insurance Services Inc | Class A Common Stock                        
Business Acquisition [Line Items]                        
Equity consideration for acquisition           $ 2,700            
AccuRisk Holdings                        
Business Acquisition [Line Items]                        
Cash consideration for acquisition         $ 98,300              
Measurement period adjustment to goodwill                     $ 300