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Reinsurance - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2020
Mar. 31, 2020
Subsequent Event [Member] | Largest remaining legacy third party financial guaranty reinsurer    
Ceded Credit Risk [Line Items]    
Reinsurance Retention Policy, Reinsured Risk, Reassumed Par Value from Third Parties, Amount $ 336.0  
Reinsurance Retention Policy, Reinsured Risk, Percentage 27.00%  
Assured Guaranty Re [Member]    
Ceded Credit Risk [Line Items]    
Amounts could be required to pay if third party exercised right to recapture business   $ 41.0
AGC [Member]    
Ceded Credit Risk [Line Items]    
Amounts could be required to pay if third party exercised right to recapture business   254.0
Standard & Poor's, A Rating [Member] | Uncollateralized [Member]    
Ceded Credit Risk [Line Items]    
Guaranty Liabilities   0.1
AM Best, A- Rating [Member] | Uncollateralized [Member]    
Ceded Credit Risk [Line Items]    
Guaranty Liabilities   $ 13.0