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Reinsurance - Narrative (Details)
$ in Millions
9 Months Ended 12 Months Ended
Jan. 01, 2024
Sep. 30, 2024
USD ($)
letter_of_credit
Dec. 31, 2023
USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsurance retention policy, number of coverage layers | letter_of_credit   2  
Reinsurance, excess retention, amount reinsured, per event   $ 105.0  
Reinsurance Contract [Axis]: Catastrophe Reinsurance Layer One      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsurance, amount retained, per event   28.0  
Reinsurance, excess retention, amount reinsured, per event   22.0  
Reinsurance Contract [Axis]: Catastrophe Reinsurance Layer Two      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsurance, amount retained, per event   50.0  
Reinsurance, excess retention, amount reinsured, per event   55.0  
Various reinsurers      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsurance retention policy, total insured amount   $ 5.0 $ 5.0
Various reinsurers | Reinsurance Contract [Axis]: Catastrophe Program - High Net Worth      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsured risk, percentage 100.00%   70.00%
Evanston | Reinsurance Contract [Axis]: Catastrophe Program - High Net Worth      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsured risk, percentage     100.00%