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Note 9 - Losses and LAE Rescissions And Denials (Details) (Mortgage Insurance Segment, USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Claims Rescissions and Denials [Abstract] |  |  |
Rescissions, Net of Reinstatements | $ 3.8 rdn_RescissionsNetofReinstatements | $ 6.4 rdn_RescissionsNetofReinstatements |
Claim Denials, Net of Reinstatements | 5.6 rdn_ClaimDenialsNetofReinstatements | 18.9 rdn_ClaimDenialsNetofReinstatements |
Claim Rescissions And Denials Related to Settlement Agreements | (24.1)rdn_RescissionsandClaimDenialsRelatedtoSettlementAgreementNetofReinstatements | 3.0 rdn_RescissionsandClaimDenialsRelatedtoSettlementAgreementNetofReinstatements |
Decrease To Our Loss Reserves Due To Estimated Rescissions And Denials | 115 rdn_DecreaseToOurLossReservesDueToEstimatedRescissionsAndDenials |  | 125 rdn_DecreaseToOurLossReservesDueToEstimatedRescissionsAndDenials
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount | 108.6 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount |  | 163.6 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount
Gross Exposure Related to Denied Claims From Previous Twelve Months | 85.5 rdn_GrossExposureRelatedToDeniedClaimsFromPreviousTwelveMonths |  |
Gross Exposure Related to Rescinded Policies Within Twenty Four Months | 79.8 rdn_GrossExposureRelatedToRescindedPoliciesWithinTwentyFourMonths |  |
Net Exposure Related to Claim Curtailments Within Twenty Four Months | 44.4 rdn_NetExposureRelatedtoClaimCurtailmentsWithinTwentyFourMonths |  |
Accrued Liability For Premiums Expected To Be Refunded From Rescissions | 7.2 rdn_AccruedLiabilityForPremiumsExpectedToBeRefundedFromRescissions |  | 9.0 rdn_AccruedLiabilityForPremiumsExpectedToBeRefundedFromRescissions
Claim Rescissions And Denials, Net of Reinstatements | (14.7)rdn_ClaimRescissionsAndDenialsNetofReinstatements | 28.3 rdn_ClaimRescissionsAndDenialsNetofReinstatements |
Claims Denied in the Last Twelve Months [Member] |  |  |
Claims Rescissions and Denials [Abstract] |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount | 13.6 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount / rdn_RescissionsDenialsandClaimCurtailmentsAxis = rdn_ClaimsDeniedInLastTwelveMonthsMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |
Curtailed Claim Payments in the Last Twenty Four Months [Member] |  |  |
Claims Rescissions and Denials [Abstract] |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount | 3.4 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount / rdn_RescissionsDenialsandClaimCurtailmentsAxis = rdn_CurtailedClaimPaymentsintheLastTwentyFourMonthsMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |
Policies Rescinded in the Last Twenty Four Months [Member] |  |  |
Claims Rescissions and Denials [Abstract] |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount | 0.8 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount / rdn_RescissionsDenialsandClaimCurtailmentsAxis = rdn_PoliciesRescindedInLastTwentyFourMonthsMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |
Bank of America Settlement Agreement [Member] |  |  |
Claims Rescissions and Denials [Abstract] |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount | $ 85.2 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount / us-gaap_LitigationCaseAxis = rdn_BankofAmericaSettlementAgreementMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | $ 133.0 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount / us-gaap_LitigationCaseAxis = rdn_BankofAmericaSettlementAgreementMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember
Loss Contingency, Settlement Agreement, Percentage of Subject Loans Not Held by Insureds or Are Non-GSE Investors | 12.00%rdn_LossContingencySettlementAgreementPercentageofSubjectLoansNotHeldbyInsuredsorAreNonGSEInvestors / us-gaap_LitigationCaseAxis = rdn_BankofAmericaSettlementAgreementMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |

X
- Definition Accrued Liability For Premiums Expected To Be Refunded From Rescissions + References No definition available. + Details
Name: | rdn_AccruedLiabilityForPremiumsExpectedToBeRefundedFromRescissions
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This concept represents the denial of a claim by the entity if the servicer of the loan does not produce documents necessary to perfect that claim, including evidence that the insured has acquired title to the property, within the time period specified in our master insurance policy. Most often, a claim denial is the result of the servicer’s inability to provide the loan origination file or other servicing documents for review. This activity is net of any reinstatements. + References No definition available. + Details
Name: | rdn_ClaimDenialsNetofReinstatements
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This concept represents amounts related to policies that were rescinded due to our review of a claim where it was determined that a loan did not qualify for insurance, and claim denials which are a result of the loan servicer not providing the documentation needed to perfect the claim. The activity is net of any reinstatements. + References No definition available. + Details
Name: | rdn_ClaimRescissionsAndDenialsNetofReinstatements
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | rdn_ClaimsRescissionsAndDenialsAbstract
Namespace Prefix: | rdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This concept represents the decrease to our loss reserve estimate related to our assumption for future rescinded policies and claim denials. + References No definition available. + Details
Name: | rdn_DecreaseToOurLossReservesDueToEstimatedRescissionsAndDenials
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The existing gross exposure related to claims and policies denied in the previous twelve months (the number of months a customer has to perfect a claim). + References No definition available. + Details
Name: | rdn_GrossExposureRelatedToDeniedClaimsFromPreviousTwelveMonths
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of gross exposure to rescinded policies within a twenty four month period (the timeframe that a customer has to either get appropriate documentation, file a suit or take other action). + References No definition available. + Details
Name: | rdn_GrossExposureRelatedToRescindedPoliciesWithinTwentyFourMonths
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This concept represents the percentage of total loans included in the settlement agreement that were either (1) not held in portfolio by the insureds, or (2) purchased by Non-GSE investors. + References No definition available. + Details
Name: | rdn_LossContingencySettlementAgreementPercentageofSubjectLoansNotHeldbyInsuredsorAreNonGSEInvestors
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This concept represents the amount of claim curtailments (the amount of the submitted claim payment not made to the lender) that the insurer has withheld due to their assessment of the failure by the servicer to comply with insurance policies and servicing guidelines as it relates to loss mitigation activities, and is net of reinstated claim amounts which were previously withheld within a twenty four month period (the timeframe that a customer has to either get appropriate documentation, file a suit or take other action). + References No definition available. + Details
Name: | rdn_NetExposureRelatedtoClaimCurtailmentsWithinTwentyFourMonths
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This concept represents the net amount related to policies that were rescinded due to our review of a claim where it was determined that a loan did not qualify for insurance, and claim denials which are a result of the loan servicer not providing the documentation needed to perfect the claim and which are included in the loans involved in a settlement agreement and are net of any reinstatements of said rescissions and denials. + References No definition available. + Details
Name: | rdn_RescissionsandClaimDenialsRelatedtoSettlementAgreementNetofReinstatements
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This concept represents amounts related to policies that were rescinded due to our review of a claim where it was determined that a loan did not qualify for insurance and are net of reinstatements. + References No definition available. + Details
Name: | rdn_RescissionsNetofReinstatements
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section W Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -URI http://asc.fasb.org/extlink&oid=27015833&loc=d3e570705-122907 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
Name: | us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LitigationCaseAxis=rdn_BankofAmericaSettlementAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |