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Reserves for Loss and Loss Expenses (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net of loss reserve discounts $ 10.0 $ 5.0
Increase (decrease) in estimates for claims 16.0 (8.0)
Adjustment expense 4.0 7.0
Liability recognized for best estimate net of reinsurance 241.0  
Liability recognized for best estimate net of reinsurance, reported losses 164.0  
Liability recognized for best estimate net of reinsurance, incurred but not reported (IBNR) 77.0  
Liability recognized for best estimate net of reinsurance, current accident year losses 40.0  
Insurance    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Liability recognized for best estimate net of reinsurance 208.0  
Liability recognized for best estimate net of reinsurance, current accident year losses 38.0  
Favorable reserve development net of premium offsets 12.0 12.0
Reinsurance & Monoline Excess    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Liability recognized for best estimate net of reinsurance 33.0  
Liability recognized for best estimate net of reinsurance, current accident year losses 2.0  
Unfavorable reserve development net of premium offsets $ 8.0 $ 5.0