XML 79 R69.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Losses and LAE - Narrative (Details) - Primary Mortgage Product - Mortgage Insurance revenues - default | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
New primary defaults | 11,756 | 10,624
Increase in number of new primary default notices (in percent) | 11.00% |
Default to claim rate estimate, gross, for new defaults | 8.00% | 8.00%

X
- Definition This concept represents the rate at which newly reported defaulted loans are expected to result in a claim. + References No definition available. + Details
Name: | rdn_DefaultToClaimRateEstimateGrossForNewDefaults
Namespace Prefix: | rdn_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition New Primary Defaults + References No definition available. + Details
Name: | rdn_NewPrimaryDefaults
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Change in Number of New Primary Default Notices + References No definition available. + Details
Name: | rdn_PercentageChangeInNumberOfNewPrimaryDefaultNotices
Namespace Prefix: | rdn_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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_LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ProductOrServiceAxis=rdn_PrimaryMortgageProductMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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