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Note 15 - Statutory Information Statutory Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Reportable Subsegments [Member]      
Statutory Accounting Practices [Line Items]      
Restricted Net Assets Held by Consolidated Subsidiaries   $ 3,300.0  
Radian Guaranty      
Statutory Accounting Practices [Line Items]      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance   1,156.1 $ 1,349.7
Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) $ (175.0)    
Statutory Accounting Practices, Dividends Paid with Approval of Regulatory Agency 175.0    
Radian Reinsurance [Member]      
Statutory Accounting Practices [Line Items]      
Capital Contributions $ 175.0    
Statutory Accounting Practices, Statutory Capital and Surplus, Balance   324.4 $ 147.6
Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease)   175.0  
Deferred Tax Assets [Member]      
Statutory Accounting Practices [Line Items]      
Statutory Accounting Practices, Statutory to GAAP, Amount of Reconciling Item   (30.6)  
Leasehold Improvements [Member]      
Statutory Accounting Practices [Line Items]      
Statutory Accounting Practices, Statutory to GAAP, Amount of Reconciling Item   $ 15.2