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Reinsurance - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Oct. 01, 2022
Jan. 10, 2022
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2022
Dec. 31, 2020
Mar. 02, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                
Plus reinsurance recoverable on unpaid losses at the end of the year     $ 4,658.0 $ 4,897.7 $ 3,298.1 $ 5,006.5 $ 3,195.2  
Reinsurance Recoverable, Allowance for Credit Loss     3.3 3.7 3.3   $ 3.8  
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease)     $ (0.4) $ 0.4 $ (0.5)      
Reinsurance Contracts [Axis]: Funds withheld credited with interest for periods after October 1, 2022                
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                
Reinsurance Retention Policy, Retrocession Premium, Interest Rate 1.75%              
Enstar                
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                
Plus reinsurance recoverable on unpaid losses at the end of the year               $ 770.0
Enstar | Reinsurance Contracts [Axis]: LPT losses reinsured]                
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                
Plus reinsurance recoverable on unpaid losses at the end of the year               $ 3,120.0
Enstar | Reinsurance Contracts [Axis]: LPT net losses reinsured                
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                
Reinsurance, Excess Retention, Amount Reinsured, Per Event   $ 3,120.0            
Enstar | Reinsurance Contracts [Axis]: LPT premium paid                
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                
Reinsurance Recoverables for Unpaid Claims and Claims Adjustment, Ceded Claims Gross   $ 3,160.0