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Note 19 - Statutory Information Radian Guaranty (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
state
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Risk to Capital Line Items [Line Items]        
Risk To Capital Ratio, Regulatory Maximum   25    
Risk-to-capital   12.8 12.1  
Radian Guaranty        
Risk to Capital Line Items [Line Items]        
Statutory Accounting Practices, Statutory Net Income Amount   $ 501.9 $ 445.1 $ 480.8
Statutory Accounting Practices, Statutory Capital and Surplus, Balance   814.1 1,201.0 1,349.7
Contingency reserve   2,109.9 1,667.0 $ 1,260.6
RIF, net [1]   40,711.3 36,793.5  
Common stock and paid-in capital   1,416.0 1,866.0  
Surplus Note   100.0 100.0  
Unassigned earnings (deficit)   (701.9) (765.0)  
Statutory Accounting Practice, Statutory Position   $ 2,924.0 $ 2,868.0  
Risk-to-capital   13.9 12.8  
Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) $ (175.0) $ 56.0    
Statutory Accounting Practices, Dividends Paid with Approval of Regulatory Agency (175.0) $ 450.0    
Related Party Transaction, Rate     0.00%  
Radian Group Inc.        
Risk to Capital Line Items [Line Items]        
Statutory Accounting Practices, Dividends Paid with Approval of Regulatory Agency $ 175.0      
Radian Group Inc. | Parent Company        
Risk to Capital Line Items [Line Items]        
Marketable Securities     $ 100.0  
Minimum | Radian Guaranty        
Risk to Capital Line Items [Line Items]        
Surplus Note, Notice of Redemption Period     30 days  
State Insurance Regulations        
Risk to Capital Line Items [Line Items]        
Number Of States That Have A Statutory Or Regulatory Risk Based Capital Requirement | state   16    
Non RBC States | Minimum        
Risk to Capital Line Items [Line Items]        
Capital Required for Capital Adequacy   $ 1.0    
Non RBC States | Maximum        
Risk to Capital Line Items [Line Items]        
Capital Required for Capital Adequacy   $ 5.0    
[1] Excludes risk ceded through all reinsurance programs (including with affiliates) and RIF on defaulted loans.