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Note 16 - Statutory Information - Statutory Information (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
state
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Statutory Accounting Practices [Line Items]      
Risk To Capital Ratio, Regulatory Maximum 25    
State Insurance Regulations      
Statutory Accounting Practices [Line Items]      
Number Of States That Have A Statutory Or Regulatory Risk Based Capital Requirement | state 16    
Radian Guaranty      
Statutory Accounting Practices [Line Items]      
Statutory Net Income (Loss) $ 166.8 $ 195.5  
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 526.9   $ 481.5
Statutory Unassigned Negative Surplus     $ (859.5)
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments 0.0    
Statutory Accounting Practices, Contingency Reserve $ 3,500.0    
Risk To Capital Ratio 11.9   12.7
Radian Reinsurance      
Statutory Accounting Practices [Line Items]      
Statutory Net Income (Loss) $ 1.9 23.9  
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 361.0   $ 360.7
Other MI Companies      
Statutory Accounting Practices [Line Items]      
Statutory Net Income (Loss) 0.0 0.7  
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 41.5   41.3
Radian Title Insurance      
Statutory Accounting Practices [Line Items]      
Statutory Net Income (Loss) 1.3 $ 0.1  
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 29.7   $ 28.8
Consolidated insurance subsidiaries      
Statutory Accounting Practices [Line Items]      
Restricted Net Assets Held by Consolidated Subsidiaries $ 4,200.0