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Note 8 - Reinsurance - QSR Program (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
QSR Program | Radian Guaranty |  |
RIF Ceded | $ 381.8 | $ 644.5

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- Definition First Lien Primary Mortgage Insurance Risk In Force Ceded + References No definition available. + Details
Name: | rdn_FirstLienPrimaryMortgageInsuranceRiskInForceCeded
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CededCreditRiskAxis=rdn_QuotaShareReinsuranceTransactionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=rdn_RadianGuarantyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |