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v3.22.4

Reinsurance - Narrative (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) reinsuranceArrangement | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Ceded Credit Risk [Line Items] |  |  |
Funds held under reinsurance agreements, off-balance sheet, asset | $ 174.5 |  | $ 167.9
Mortgage |  |  |
Ceded Credit Risk [Line Items] |  |  |
RIF | $ 66,100.0 |  | 60,900.0
QSR Program | Maximum |  |  |
Ceded Credit Risk [Line Items] |  |  |
RIF |  | $ 8,500.0 |
Radian Guaranty | Mortgage |  |  |
Ceded Credit Risk [Line Items] |  |  |
Number of fully collateralized reinsurance arrangements with the eagle re-issuers | reinsuranceArrangement | 6 |  |
Number of Active Fully Collateralized Reinsurance Arrangements With the Eagle Re Issuers | reinsuranceArrangement | 5 |  |
Radian Guaranty | Mortgage | Minimum |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance retention policy, term of coverage, period | 10 years |  |
Radian Guaranty | Mortgage | Maximum |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance retention policy, term of coverage, period | 12 years 6 months |  |
Radian Guaranty | QSR Program |  |  |
Ceded Credit Risk [Line Items] |  |  |
RIF ceded | $ 142.4 |  | $ 207.1
Radian Guaranty | Excess-of-Loss Program |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance optional clean-up call, outstanding principal balance percentage threshold | 0.10 |  |
Radian Guaranty | Excess-of-Loss Program | Minimum |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance right to terminate, optional call date, years after issuance | 5 years |  |
Radian Guaranty | Excess-of-Loss Program | Maximum |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance right to terminate, optional call date, years after issuance | 7 years |  |

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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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- Definition Funds Held Under Reinsurance Agreements, Off-Balance Sheet, Asset + References No definition available. + Details
Name: | rdn_FundsHeldUnderReinsuranceAgreementsOffBalanceSheetAsset
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number Of Active Fully Collateralized Reinsurance Arrangements With Third Parties + References No definition available. + Details
Name: | rdn_NumberOfActiveFullyCollateralizedReinsuranceArrangementsWithThirdParties
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number Of Fully Collateralized Reinsurance Arrangements With Third Parties + References No definition available. + Details
Name: | rdn_NumberOfFullyCollateralizedReinsuranceArrangementsWithThirdParties
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Reinsurance Agreement, Optional Right, Percent of Reinsurance Coverage Threshold + References No definition available. + Details
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Namespace Prefix: | rdn_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition Reinsurance Agreement, Right To Terminate, Option Call Date, Period After Issuance of Insurance-Linked Notes + References No definition available. + Details
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Namespace Prefix: | rdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Reinsurance Retention Policy, Term Of Coverage, Period + References No definition available. + Details
Name: | rdn_ReinsuranceRetentionPolicyTermOfCoveragePeriod
Namespace Prefix: | rdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Statutory Accounting Practices, Risk In Force + References No definition available. + Details
Name: | rdn_StatutoryAccountingPracticesRiskInForce
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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_CededCreditRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |