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Note 19 - Statutory Information Risk To Capital Calculation (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
state
subsidiaries
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Risk to Capital Line Items [Line Items]      
Risk To Capital Ratio, Regulatory Maximum 25    
Number of Subsidiaries | subsidiaries 6    
Risk-to-capital 12.1 13.6  
Parent Company [Member]      
Risk to Capital Line Items [Line Items]      
Related Party Transaction, Rate 0.00%   0.00%
Other MI Companies [Member]      
Risk to Capital Line Items [Line Items]      
Statutory Accounting Practices, Statutory Net Income Amount $ 0.1 $ (6.1) $ 92.9
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 58.6 57.1 55.0
Contingency reserve 1.7 1.5 1.1
Radian Insurance [Member]      
Risk to Capital Line Items [Line Items]      
RIF, net 24.1    
Radian Guaranty [Member]      
Risk to Capital Line Items [Line Items]      
Statutory Accounting Practices, Statutory Net Income Amount 445.1 480.8 754.8
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 1,201.0 1,349.7 1,686.5
Contingency reserve 1,667.0 1,260.6 860.9
RIF, net [1] 36,793.5 35,357.8  
Capital 1,866.0 2,041.0  
Surplus Notes 100.0 0.0 325.0
Cumulative Earnings (Deficit) (765.0) (691.3)  
Statutory Accounting Practice, Statutory Position $ 2,868.0 $ 2,610.3  
Risk-to-capital 12.8 13.5  
Radian Reinsurance [Member]      
Risk to Capital Line Items [Line Items]      
Statutory Accounting Practices, Statutory Net Income Amount $ 64.3 $ 60.3 (1.0)
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 328.9 147.6 138.7
Contingency reserve 234.0 $ 180.3 128.8
Statutory Accounting Practices, Statutory Capital and Surplus Required $ 20.0    
Radian Mortgage Guaranty Inc. [Member]      
Risk to Capital Line Items [Line Items]      
Proceeds from Contributions from Parent     $ 20.0
State Insurance Regulations [Member]      
Risk to Capital Line Items [Line Items]      
Number Of States That Have A Statutory Or Regulatory Risk Based Capital Requirement | state 16    
Minimum [Member] | Non RBC States [Member]      
Risk to Capital Line Items [Line Items]      
Capital Required for Capital Adequacy $ 1.0    
Maximum [Member] | Non RBC States [Member]      
Risk to Capital Line Items [Line Items]      
Capital Required for Capital Adequacy $ 5.0    
[1] Excludes risk ceded through reinsurance contracts (to third parties and affiliates) and RIF on defaulted loans.