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Description of Business and Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Net earned premium $ 107.5 $ 42.5
Agency commissions, net 23.8 16.7
Ceding commissions, net 38.9 37.6
Policy fees 12.0 11.1
MGA commissions, net 0.1 0.0
Claims processing fees 0.6 0.0
Other revenue 3.7 2.8
Net investment income 23.1 9.0
Total revenue $ 209.7 $ 119.7