XML 71 R52.htm IDEA: XBRL DOCUMENT
v3.22.4

Significant Accounting Policies - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) payment reportingUnit category | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Significant Accounting Policies Line Items [Line Items] |  |  |
Maximum maturity duration for short term investment grouping | 12 months |  |
Number of payments missed for insured loans | payment | 2 |  |
Number of reporting units | reportingUnit | 1 |  |
Depreciation and amortization expense | $ 15.2 | $ 15.9 | $ 18.3
Minimum |  |  |
Significant Accounting Policies Line Items [Line Items] |  |  |
Number of payments missed for insured loans | payment | 2 |  |
Useful life | 3 years |  |
Maximum |  |  |
Significant Accounting Policies Line Items [Line Items] |  |  |
Term of contract | 12 months |  |
Useful life | 7 years |  |
Mortgage |  |  |
Significant Accounting Policies Line Items [Line Items] |  |  |
Number of mortgage insurance product categories | category | 2 |  |
Premium receivable for deferred monthly premiums | $ 32.0 | 30.3 |
Contractual deferred monthly premiums | $ 77.1 | $ 74.0 |

X
- Definition Contractual Deferred Monthly Premiums + References No definition available. + Details
Name: | rdn_ContractualDeferredMonthlyPremiums
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This represents the maximum maturity duration when determining the investments in the portfolio which are grouped as short-term investments. + References No definition available. + Details
Name: | rdn_MaximumMaturityDurationForShortTermInvestmentGrouping
Namespace Prefix: | rdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of major categories used to define mortgage insurance products + References No definition available. + Details
Name: | rdn_NumberOfMortgageInsuranceProductCategories
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Payments Missed For Insured Loans + References No definition available. + Details
Name: | rdn_NumberOfPaymentsMissedForInsuredLoans
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Premium Receivable For Deferred Monthly Premiums + References No definition available. + Details
Name: | rdn_PremiumReceivableForDeferredMonthlyPremiums
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Significant Accounting Policies Line Items [Line Items] + References No definition available. + Details
Name: | rdn_SignificantAccountingPoliciesLineItemsLineItems
Namespace Prefix: | rdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
Name: | us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References No definition available. + Details
Name: | us-gaap_NumberOfReportingUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
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: |