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Subsequent Event (Details) - Subsequent Event - USD ($)
$ in Millions
 1 Months Ended
Jan. 31, 2025
Feb. 10, 2025
Subsequent Event [Line Items]    
Reinsurance program, limits on a per occurrence basis $ 1,290.0  
Reinsurance program, retention per occurrence basis 150.0  
Reinsurance, coverage limit 20.0  
Reinsurance, loss reinsurance treaty available to offset losses, loss excess amount $ 5.0  
Reinsurance limit of coverage layer placed as parametrics coverage (in percent) 1.00%  
Reinsurance limit $ 650.0  
Reinsurance, losses for paramedic coverage not eligible for reinsurance coverage 6.5  
Reinsurance, retention and reinsurance limit 1,440.0  
Total reinstatement premium 101.0  
Reinsurance Contract [Axis]: Reinsurance, Second Event    
Subsequent Event [Line Items]    
Reinsurance program, limits on a per occurrence basis $ 1,238.0  
Co-participation for losses of coverage layer (in percent) 8.00%  
Co-participation in losses for coverage layer $ 1,300.0  
Fire    
Subsequent Event [Line Items]    
Amount paid out related to Wildfires   $ 800.0
Amount collected from reinsurers   500.0
Cash and short-term investments on-hand   $ 1,000.0
Minimum | Fire    
Subsequent Event [Line Items]    
Estimated gross catastrophe losses 1,600.0  
Estimated net catastrophe losses 155.0  
Reinsurance program, limits on a per occurrence basis $ 10.0  
Minimum | Fire, Palisades Wildfires    
Subsequent Event [Line Items]    
Losses attributable to catastrophic event (in percent) 55.00%  
Minimum | Fire, Eaton Wildfires    
Subsequent Event [Line Items]    
Losses attributable to catastrophic event (in percent) 40.00%  
Maximum | Fire    
Subsequent Event [Line Items]    
Estimated gross catastrophe losses $ 2,000.0  
Estimated net catastrophe losses 325.0  
Reinsurance program, limits on a per occurrence basis $ 20.0  
Maximum | Fire, Palisades Wildfires    
Subsequent Event [Line Items]    
Losses attributable to catastrophic event (in percent) 60.00%  
Maximum | Fire, Eaton Wildfires    
Subsequent Event [Line Items]    
Losses attributable to catastrophic event (in percent) 45.00%