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Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]      
Accumulated Amortization $ (17.2)   $ (16.2)
Indefinite-lived Intangible Assets [Line Items]      
Gross Carrying Amount 33.3   33.2
Accumulated Amortization (17.2)   (16.2)
Net Carrying Amount 16.1   17.0
Amortization expense related to intangible assets $ 0.9 $ 1.2  
Agency and carrier relationships      
Finite-Lived Intangible Assets [Line Items]      
Weighted- Average Useful Life Remaining (in years) 3 years 4 months 24 days    
Gross Carrying Amount $ 3.4   3.4
Accumulated Amortization (1.9)   (1.8)
Net Carrying Amount 1.5   1.6
Indefinite-lived Intangible Assets [Line Items]      
Accumulated Amortization $ (1.9)   (1.8)
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Weighted- Average Useful Life Remaining (in years) 5 years 7 months 6 days    
Gross Carrying Amount $ 18.5   18.5
Accumulated Amortization (14.5)   (13.8)
Net Carrying Amount 4.0   4.7
Indefinite-lived Intangible Assets [Line Items]      
Accumulated Amortization $ (14.5)   (13.8)
Other      
Finite-Lived Intangible Assets [Line Items]      
Weighted- Average Useful Life Remaining (in years) 7 months 6 days    
Gross Carrying Amount $ 0.9   0.8
Accumulated Amortization (0.8)   (0.6)
Net Carrying Amount 0.1   0.2
Indefinite-lived Intangible Assets [Line Items]      
Accumulated Amortization (0.8)   (0.6)
State licenses and domain name      
Indefinite-lived Intangible Assets [Line Items]      
Net Carrying Amount $ 10.5   $ 10.5