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Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]          
Accumulated Amortization $ (19.3)   $ (19.3)   $ (16.9)
Indefinite-lived Intangible Assets [Line Items]          
Gross Carrying Amount 44.3   44.3   44.2
Accumulated Amortization (19.3)   (19.3)   (16.9)
Net Carrying Amount 25.0   25.0   27.3
Amortization expense related to intangible assets 1.2 $ 1.1 2.4 $ 2.2  
State licenses and domain name          
Indefinite-lived Intangible Assets [Line Items]          
Net Carrying Amount $ 10.5   $ 10.5   10.5
Agency and carrier relationships          
Finite-Lived Intangible Assets [Line Items]          
Weighted- Average Useful Life Remaining (in years) 4 years 4 months 24 days   4 years 4 months 24 days    
Gross Carrying Amount $ 13.5   $ 13.5   13.5
Accumulated Amortization (6.0)   (6.0)   (5.1)
Net Carrying Amount 7.5   7.5   8.4
Indefinite-lived Intangible Assets [Line Items]          
Accumulated Amortization $ (6.0)   $ (6.0)   (5.1)
Customer relationships          
Finite-Lived Intangible Assets [Line Items]          
Weighted- Average Useful Life Remaining (in years) 4 years 10 months 24 days   4 years 10 months 24 days    
Gross Carrying Amount $ 18.5   $ 18.5   18.5
Accumulated Amortization (12.3)   (12.3)   (10.9)
Net Carrying Amount 6.2   6.2   7.6
Indefinite-lived Intangible Assets [Line Items]          
Accumulated Amortization $ (12.3)   $ (12.3)   (10.9)
Other          
Finite-Lived Intangible Assets [Line Items]          
Weighted- Average Useful Life Remaining (in years) 5 years 4 months 24 days   5 years 4 months 24 days    
Gross Carrying Amount $ 1.8   $ 1.8   1.7
Accumulated Amortization (1.0)   (1.0)   (0.9)
Net Carrying Amount 0.8   0.8   0.8
Indefinite-lived Intangible Assets [Line Items]          
Accumulated Amortization $ (1.0)   $ (1.0)   $ (0.9)