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Reserves for Losses and Adjustment Expenses - Reconciliation of Beginning and Ending Consolidated Loss and Loss Adjustment Expenses (LAE) Reserves (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jan. 10, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
May 30, 2022
Mar. 02, 2020
Dec. 31, 2019
Insurance [Abstract]                  
Provision for losses and LAE, beginning balance   $ 7,710.9 $ 7,611.8 $ 7,611.8 $ 7,165.3 $ 6,951.8      
Less reinsurance recoverable       (4,897.7) (3,298.1) (3,195.2)     $ (2,319.8)
Net losses and LAE reserves, beginning balance   2,813.2 4,313.7 4,313.7 3,970.1 4,632.0      
Movement in net provision for losses and LAE for claims incurred:                  
Current year   723.5 775.0 1,651.9 1,648.2 1,841.7      
Prior years   6.4 7.3 (28.1) (45.1) 0.9      
Total incurred   717.1 767.7 1,680.0 1,693.3 1,840.8      
Net Losses and LAE payments for claims incurred:                  
Current year   (30.8) (35.5) (192.7) (729.1) (404.9)      
Prior years   (438.6) (616.9) (1,098.4) (580.7) (1,359.7)      
Total paid   (469.4) (652.4) (1,291.1) (1,309.8) (1,764.6)      
Foreign exchange (gains)/losses   22.0 (83.6) (49.3) (39.9) 80.4      
Net losses and LAE reserves, ending balance   3,082.9 2,505.3 2,813.2 4,313.7 3,970.1      
Plus reinsurance recoverable on unpaid losses at the end of the year   4,658.0 5,006.5 4,897.7 3,298.1 3,195.2      
Provision for losses and LAE at the end of the year   7,740.9 7,511.8 7,710.9 7,611.8 7,165.3      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                  
Net loss and LAE expenses disposed (1)   0.0 1,840.1 1,840.1 0.0 818.5      
Plus reinsurance recoverable on unpaid losses at the end of the year   4,658.0 5,006.5 4,897.7 3,298.1 3,195.2      
Reinsurance Contracts [Axis]: LPT                  
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                  
Reinsurance recoverable total             $ 2,610.1    
Insurance                  
Insurance [Abstract]                  
Provision for losses and LAE, beginning balance   1,452.5 2,165.3 2,165.3 1,874.4        
Net losses and LAE reserves, beginning balance   1,452.5 2,165.3 2,165.3 1,874.4        
Movement in net provision for losses and LAE for claims incurred:                  
Prior years   (8.5)   (86.9)          
Net Losses and LAE payments for claims incurred:                  
Net losses and LAE reserves, ending balance       1,452.5 2,165.3 1,874.4      
Provision for losses and LAE at the end of the year   1,641.7 $ 1,314.9 $ 1,452.5 $ 2,165.3 $ 1,874.4      
Insurance | Reinsurance Contracts [Axis]: LPT, deferred gain                  
Movement in net provision for losses and LAE for claims incurred:                  
Prior years   (13.2)              
Insurance | Reinsurance Contracts [Axis]: LPT, offset post-LPT years                  
Movement in net provision for losses and LAE for claims incurred:                  
Prior years   $ (4.7)              
Enstar                  
Net Losses and LAE payments for claims incurred:                  
Plus reinsurance recoverable on unpaid losses at the end of the year               $ 770.0  
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]                  
Net Losses and LAE payments for claims incurred:                  
Plus reinsurance recoverable on unpaid losses at the end of the year               3,120.0  
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