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Acquisitions (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
agency
Dec. 31, 2023
USD ($)
agency
Sep. 30, 2023
USD ($)
Asset Acquisition [Line Items]      
Acquisitions of noncontrolling interests $ 3.2 $ 3.2  
Parent      
Asset Acquisition [Line Items]      
Acquisitions of noncontrolling interests 2.7 2.7  
Non controlling Interests      
Asset Acquisition [Line Items]      
Acquisitions of noncontrolling interests 0.5 0.5  
Two Insurance Agencies      
Asset Acquisition [Line Items]      
Fair value of equity method investment $ 1.6 $ 1.6  
Two Insurance Agencies      
Asset Acquisition [Line Items]      
Number of insurance agencies purchased | agency 2 2  
Consideration transferred $ 5.9    
Payments for asset acquisitions 4.3    
Deferred consideration 0.7    
Net working capital $ 1.1 $ 1.1  
Asset acquisition, equity interest in acquiree, remeasurement gain     $ 1.3
Customer relationships      
Asset Acquisition [Line Items]      
Finite-lived intangible asset, useful life (in years) 4 years 10 months 24 days 4 years 10 months 24 days  
Customer relationships | Two Insurance Agencies      
Asset Acquisition [Line Items]      
Total purchase price $ 4.8    
Finite-lived intangible asset, useful life (in years) 7 years 7 years