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Note 18 - Statutory Information Statutory Capital Requirements (Details) $ in Millions | Dec. 31, 2019 USD ($) state | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | ---
Risk to Capital Line Items [Line Items] |  |  |  |
Risk To Capital Ratio, Regulatory Maximum |  | 25 |  |
Radian Guaranty |  |  |  |
Risk to Capital Line Items [Line Items] |  |  |  |
Net Risk In Force | [1] | $ 44,076.7 | $ 40,711.3 |
Common stock and paid-in capital |  | 1,041.0 | 1,416.0 |
Surplus Note |  | 100.0 | 100.0 |
Unassigned earnings (deficit) |  | (503.3) | (701.9) |
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
Statutory Accounting Practice, Statutory Position |  | $ 3,245.5 | $ 2,924.0 |
Risk-to-capital |  | 13.6 | 13.9 |
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.

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- Definition This concept represents the risk in force (an estimate of the maximum loss exposure that an entity has at any point in time) net of risk ceded through reinsurance contracts and net of risk in force on defaulted loans. + References No definition available. + Details
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- Definition This concept represents an entity's ratio of net risk in force (excludes risk ceded through reinsurance contracts and risk in force on defaulted loans) to the amount of statutory capital (defined as the sum of statutory policyholders' surplus plus statutory contingency reserves). + References No definition available. + Details
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- Definition This concept represents the maximum ratio of net risk in force (net of risk ceded through reinsurance contracts and risk in force on defaulted loans) to statutory capital (defined as the sum of statutory policyholders' surplus plus statutory contingency reserves) allowed in those states which have statutory risk-based capital requirements. + References No definition available. + Details
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