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Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization $ (16.9) $ (12.5)
Total 16.8  
Indefinite-lived Intangible Assets [Line Items]    
Gross Carrying Amount 44.2 39.4
Accumulated Amortization (16.9) (12.5)
Net Carrying Amount 27.3 26.9
Amortization expense related to intangible assets 4.4 5.3
State licenses and domain name    
Indefinite-lived Intangible Assets [Line Items]    
Net Carrying Amount $ 10.5 10.5
Agency and carrier relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Useful Life Remaining (in years) 4 years 10 months 24 days  
Gross Carrying Amount $ 13.5 13.5
Accumulated Amortization (5.1) (3.4)
Total 8.4 10.1
Indefinite-lived Intangible Assets [Line Items]    
Accumulated Amortization $ (5.1) (3.4)
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Useful Life Remaining (in years) 4 years 10 months 24 days  
Gross Carrying Amount $ 18.5 13.7
Accumulated Amortization (10.9) (8.5)
Total 7.6 5.2
Indefinite-lived Intangible Assets [Line Items]    
Accumulated Amortization $ (10.9) (8.5)
Other    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Useful Life Remaining (in years) 5 years 7 months 6 days  
Gross Carrying Amount $ 1.7 1.7
Accumulated Amortization (0.9) (0.6)
Total 0.8 1.1
Indefinite-lived Intangible Assets [Line Items]    
Accumulated Amortization $ (0.9) $ (0.6)