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Reinsurance - Narrative (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2022
USD ($)
reinsuranceArrangement
Dec. 31, 2021
USD ($)
Mortgage    
Ceded Credit Risk [Line Items]    
RIF ceded $ 65,300.0 $ 60,900.0
Radian Guaranty    
Ceded Credit Risk [Line Items]    
Funds held under reinsurance agreements, asset $ 173.8 167.9
Radian Guaranty | Maximum | Mortgage    
Ceded Credit Risk [Line Items]    
Reinsurance retention policy, term of coverage, period 12 years 6 months  
Radian Guaranty | Minimum    
Ceded Credit Risk [Line Items]    
Reinsurance retention policy, term of coverage, period 10 years  
Excess-of-Loss Program | Radian Guaranty    
Ceded Credit Risk [Line Items]    
Number of fully collateralized reinsurance arrangements with the eagle re issuers | reinsuranceArrangement 6  
Percent of reinsurance coverage threshold (in percent) 0.10  
Excess-of-Loss Program | Radian Guaranty | Maximum    
Ceded Credit Risk [Line Items]    
Right to termination on or after option call date, period after issuance of insurance-linked notes 7 years  
Excess-of-Loss Program | Radian Guaranty | Minimum    
Ceded Credit Risk [Line Items]    
Right to termination on or after option call date, period after issuance of insurance-linked notes 5 years  
2022 QSR Agreement | Maximum    
Ceded Credit Risk [Line Items]    
RIF ceded $ 8,500.0  
2022 QSR Agreement | Radian Guaranty    
Ceded Credit Risk [Line Items]    
RIF ceded $ 2,710.0 $ 0.0