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Note 7 - Goodwill and Other Acquired Intangible Assets, Net - Interim Impairment Analysis (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2020 USD ($)
Real Estate segment |
Acquired Finite-Lived Intangible Assets [Line Items] |
Goodwill and Intangible Asset Impairment | $ 0.0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. + References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rdn_RealEstateSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |