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Reinsurance - Narrative (Details)
$ in Millions
6 Months Ended
Jul. 01, 2022
USD ($)
Jun. 30, 2022
USD ($)
reinsuranceArrangement
Dec. 31, 2021
USD ($)
Mortgage      
Ceded Credit Risk [Line Items]      
RIF ceded   $ 63,800.0 $ 60,900.0
Radian Guaranty      
Ceded Credit Risk [Line Items]      
Funds held under reinsurance agreements, asset   $ 127.3 $ 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  
2022 QSR | Maximum | Subsequent Event      
Ceded Credit Risk [Line Items]      
RIF ceded $ 8,500.0    
2022 QSR | Radian Guaranty | Subsequent Event      
Ceded Credit Risk [Line Items]      
Ceding commission % 20.00%    
2022 QSR | Radian Guaranty | Maximum | Subsequent Event      
Ceded Credit Risk [Line Items]      
Profit commission % 59.00%