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Statutory Information - Narrative (Details)
$ in Millions
9 Months Ended
Feb. 11, 2022
USD ($)
Sep. 30, 2022
USD ($)
state
Dec. 31, 2021
Statutory Accounting Practices [Line Items]      
Risk to capital ratio, regulatory maximum   25  
Statutory accounting practices, amount available for return of capital with regulatory approval $ 500.0    
Consolidated insurance subsidiaries      
Statutory Accounting Practices [Line Items]      
Restricted net assets held by consolidated subsidiaries   $ 4,300.0  
Radian Guaranty      
Statutory Accounting Practices [Line Items]      
Risk to capital ratio     11.1
Statutory accounting practices, contingency reserve   4,200.0  
Statutory accounting practices, distributions, decrease $ 500.0    
Radian Reinsurance      
Statutory Accounting Practices [Line Items]      
Payments of ordinary dividends   $ 32.5  
State Insurance Regulations      
Statutory Accounting Practices [Line Items]      
Number of states that have a statutory or regulatory risk based capital requirement | state   16