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Reserves for Loss and Loss Expenses (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net of loss reserve discounts $ 26.0 $ 16.0
Increase (decrease) in estimates for claims 20.0 (13.0)
Adjustment expense 37.0 5.0
Liability recognized for best estimate net of reinsurance 348.0  
Liability recognized for best estimate net of reinsurance, current accident year losses 4.0  
Liability recognized for best estimate net of reinsurance, reported losses 343.0  
Liability recognized for best estimate net of reinsurance, incurred but not reported (IBNR) 5.0  
Insurance    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Liability recognized for best estimate net of reinsurance 299.0  
Liability recognized for best estimate net of reinsurance, current accident year losses 2.0  
Favorable reserve development net of premium offsets   8.0
Unfavorable reserve development net of premium offsets 33.0  
Reinsurance & Monoline Excess    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Liability recognized for best estimate net of reinsurance 49.0  
Liability recognized for best estimate net of reinsurance, current accident year losses 2.0  
Unfavorable reserve development net of premium offsets $ 4.0 $ 3.0