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Note 18 - Statutory Information Statutory Financial Statements (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) state subsidiaries | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Radian Insurance |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Risk In Force |  | $ 10.2 |  |
Radian Guaranty |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Statutory Accounting Practices, Statutory Net Income Amount |  | 703.4 | $ 501.9 | $ 445.1
Statutory Accounting Practices, Statutory Capital and Surplus, Balance |  | 637.7 | 814.1 | 1,201.0
Contingency Reserve |  | 2,607.8 | 2,109.9 | 1,667.0
Surplus Note |  | 100.0 | 100.0 |
Radian Reinsurance |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Statutory Accounting Practices, Statutory Net Income Amount |  | 101.6 | 86.1 | 64.3
Statutory Accounting Practices, Statutory Capital and Surplus, Balance |  | 455.6 | 356.2 | 328.9
Contingency Reserve |  | 360.3 | 293.5 | 234.0
Other MI Companies |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Statutory Accounting Practices, Statutory Net Income Amount |  | 0.1 | (2.8) | 0.1
Statutory Accounting Practices, Statutory Capital and Surplus, Balance |  | 45.7 | 58.0 | 58.6
Contingency Reserve |  | 1.8 | $ 1.7 | $ 1.7
Radian Title Insurance |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Statutory Accounting Practices, Statutory Net Income Amount |  | 0.3 |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance |  | $ 27.0 |  |
Number of States in which Entity Operates | state |  | 39 |  |
Subsequent Event | Radian Guaranty |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Surplus Note | $ 200.0 |  |  |
Related Party Transaction, Rate | 3.00% |  |  |
Subsequent Event | Radian Reinsurance |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Risk In Force | $ 6,000.0 |  |  |
Statutory Accounting Practices, Dividends Paid with Approval of Regulatory Agency | 465.0 |  |  |
Subsequent Event | Radian Group Inc. |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Marketable Securities | $ 200.0 |  |  |
Minimum | Subsequent Event | Radian Guaranty |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Surplus Note, Notice of Redemption Period | 30 days |  |  |
Differences Between GAAP Basis and SAPP Basis |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Mortgage Guaranty Insurance Companies Are Required Each Year To Establish A Contingency Reserve Equal To This Percentage Of Premiums Earned In Such Year |  | 50.00% |  |
Number of Years That a Contingency Reserve Must Be Maintained Under SAPP |  | 10 years |  |
Loss Ratio |  | 35.00% |  |
PENNSYLVANIA |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Number of Subsidiaries | subsidiaries |  | 2 |  |

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