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Share-Based Compensation and Other Benefit Programs - Narrative (Details)
12 Months Ended 72 Months Ended
Dec. 31, 2023
USD ($)
anniversary
$ / shares
shares
Dec. 31, 2022
USD ($)
anniversary
$ / shares
shares
Dec. 31, 2021
USD ($)
anniversary
$ / shares
shares
Dec. 31, 2022
anniversary
shares
Feb. 29, 2024
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum percentage of base earnings qualifying for pre-tax contributions 100.00%        
Defined contribution plan, annual contribution per employee, amount $ 22,500        
Maximum catch-up amount $ 7,500,000        
Matching contribution percentage 100.00%        
Base earnings qualifying for parent company matching contribution, percent 6.00%        
Matching funds expense $ 8,000,000 $ 10,000,000 $ 8,000,000    
Performance-Based          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average grant date fair value (in usd per share) | $ / shares $ 23.05        
Performance-Based | 2021 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of RSUs vested $ 27,000,000        
Award period   3 years      
Performance-Based | 2020 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average grant date fair value (in usd per share) | $ / shares   $ 20.09      
Fair value of RSUs vested   $ 17,000,000      
Award period     3 years    
Performance-Based | 2019 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average grant date fair value (in usd per share) | $ / shares     $ 20.39    
Fair value of RSUs vested     $ 19,000,000    
Performance-Based | 2022 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award period 3 years        
Performance-Based | Minimum | 2021 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payout percentage of target award   0.00%      
Post-vesting holding period   1 year      
Performance-Based | Minimum | 2020 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payout percentage of target award     0.00%    
Post-vesting holding period     1 year    
Performance-Based | Minimum | 2022 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payout percentage of target award 0.00%        
Post-vesting holding period 1 year        
Performance-Based | Maximum | 2021 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payout percentage of target award 200.00%        
Performance-Based | Maximum | 2020 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payout percentage of target award   200.00%      
Performance-Based | Maximum | 2019 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payout percentage of target award     200.00%    
Time-Vested          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average grant date fair value (in usd per share) | $ / shares $ 25.13        
Time-Vested | 2021 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   3 years      
Fair value of RSUs vested $ 16,000,000        
Number of anniversaries of the grant date | anniversary   3   3  
Time-Vested | 2020 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
Weighted-average grant date fair value (in usd per share) | $ / shares   $ 20.61      
Fair value of RSUs vested   $ 11,000,000      
Number of anniversaries of the grant date | anniversary     3    
Time-Vested | 2019 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average grant date fair value (in usd per share) | $ / shares     $ 21.71    
Fair value of RSUs vested     $ 18,000,000    
Time-Vested | 2022 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 3 years        
Number of anniversaries of the grant date | anniversary 3        
Time-Vested | Minimum | 2021 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   1 year      
Time-Vested | Minimum | 2020 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     1 year    
Time-Vested | Minimum | 2022 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 1 year        
Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected vesting or offering term 4 years        
Stock options granted (in shares) | shares       0  
Options | 2022 Award Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted (in shares) | shares 0        
Options | Award vesting percentage on or after the third anniversary of grant date          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage 50.00%        
Options | Award vesting percentage on or after the fourth anniversary of grant date          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage 50.00%        
2021 Equity Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares of common stock authorized for issuance | shares 8,300,000        
Number of shares remaining available for grant (shares reserve) | shares 5,300,000        
Equity Compensation Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum contractual term for all awards 10 years        
Unrecognized compensation expense $ 28,600,000        
Period for recognition 1 year 10 months 24 days        
Equity Compensation Plans | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 1 year        
Equity Compensation Plans | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 3 years        
Amended and Restated Radian Group Inc. Employee Stock Purchase Plan | ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected vesting or offering term 6 months        
Discount percentage from market price 15.00%        
Shares issued to employees under ESPP plans (in shares) | shares 100,000 100,000 100,000    
Amended and Restated Radian Group Inc. Employee Stock Purchase Plan | ESPP | Subsequent Event          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
ESPP, number of shares available for issuance | shares         1,400,000