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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 servicers percentagepoint | Jun. 30, 2013 | Jun. 30, 2014 servicers percentagepoint | Jun. 30, 2013 | Dec. 31, 2013
Rescissions And Denials [Line Items] |  |  |  |  |  |  |  |  |
Decrease To Our Loss Reserves Due To Estimated Rescissions And Denials | $ 192 |  |  |  | $ 192 |  |  |  | $ 247
Increase To Our Loss Reserves Due To Estimated Future Reinstatements Of Previously Rescinded Policies And Denied Claims | 272 |  |  |  | 272 |  |  |  | 283
Claims Rescissions and Denials [Abstract] |  |  |  |  |  |  |  |  |
Claim rescissions | 17.7 |  | 19.6 |  | 33.8 |  | 34.9 |  |
Claim denials | (6.2) |  | 100.0 |  | 6.0 |  | 127.2 |  |
Total rescissions and denials | 11.5 | [1] | 119.6 | [1] | 39.8 | [1] | 162.1 | [1] |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount | 269.1 |  |  |  | 269.1 |  |  |  | 281.9
Number of Servicers With Which the Entity is in Settlement Discussions With | 1 |  |  |  | 1 |  |  |  |
Accrued Liability For Premiums Expected To Be Refunded From Rescissions | 12.6 |  |  |  | 12.6 |  |  |  | 17.0
Percentage Point Change In Severity Used In Assumption Shift Analysis | 1 |  |  |  | 1 |  |  |  |
First Lien Primary Claim Severity |  |  |  |  | 28.00% |  |  |  |
Impact To Loss Reserves Based On One Percentage Change In Primary Claim Severity | 44 |  |  |  | 44 |  |  |  |
First Lien Pool Claim Severity |  |  |  |  | 43.00% |  |  |  |
Impact To Loss Reserves Based On One Percentage Change In Pool Claim Severity | 2 |  |  |  | 2 |  |  |  |
Weighted Average Default To Claim Rate Assumption Net Of Denials And Rescissions |  |  |  |  | 45.00% |  |  |  | 47.00%
Impact To Loss Reserves Based On One Percentage Change in Default To Claim Rate | 29 |  |  |  | 29 |  |  |  |
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 | 145.1 |  |  |  | 145.1 |  |  |  |
Gross Exposure Related to Denied Claims From Previous Twelve Months |  |  |  |  | 202.3 |  |  |  |
Number of Months That the Gross Reinstatement Rate Used in Estimating Claim Liability Declines |  |  |  |  | 12 months |  |  |  |
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 | 6.5 |  |  |  | 6.5 |  |  |  |
Claim Curtailments [Member] |  |  |  |  |  |  |  |  |
Claims Rescissions and Denials [Abstract] |  |  |  |  |  |  |  |  |
Claim Curtailments, Gross |  |  |  |  | 77.1 |  |  |  |
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 | 104.4 |  |  |  | 104.4 |  |  |  |
Gross Exposure Related to Rescinded Policies Within Twenty Four Months |  |  |  |  | $ 289.4 |  |  |  |
Number of Months That the Gross Reinstatement Rate Used in Estimating Claim Liability Declines |  |  |  |  | 24 months |  |  |  |
Maximum [Member] | Claims Denied in the Last Twelve Months [Member] |  |  |  |  |  |  |  |  |
Claims Rescissions and Denials [Abstract] |  |  |  |  |  |  |  |  |
Gross Reinstatement Percentage Assumption for Denied Claims | 60.00% |  |  |  | 60.00% |  |  |  |
Maximum [Member] | Curtailed Claim Payments in the Last Twenty Four Months [Member] |  |  |  |  |  |  |  |  |
Claims Rescissions and Denials [Abstract] |  |  |  |  |  |  |  |  |
Gross Reinstatement Percentage Assumption on Claim Curtailments | 30.00% |  |  |  | 30.00% |  |  |  |
Maximum [Member] | Policies Rescinded in the Last Twenty Four Months [Member] |  |  |  |  |  |  |  |  |
Claims Rescissions and Denials [Abstract] |  |  |  |  |  |  |  |  |
Gross Reinstatement Percentage Assumption on Rescinded Policies | 20.00% |  |  |  | 20.00% |  |  |  |
Minimum [Member] | Claims Denied in the Last Twelve Months [Member] |  |  |  |  |  |  |  |  |
Claims Rescissions and Denials [Abstract] |  |  |  |  |  |  |  |  |
Gross Reinstatement Percentage Assumption for Denied Claims | 0.00% |  |  |  | 0.00% |  |  |  |
Minimum [Member] | Policies Rescinded in the Last Twenty Four Months [Member] |  |  |  |  |  |  |  |  |
Claims Rescissions and Denials [Abstract] |  |  |  |  |  |  |  |  |
Gross Reinstatement Percentage Assumption on Rescinded Policies | 0.00% |  |  |  | 0.00% |  |  |  |
[1] | Includes an amount related to a small number of submitted claims that were subsequently withdrawn by the insured.

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. + References No definition available. + Details
Name: | rdn_ClaimDenials
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. + References No definition available. + Details
Name: | rdn_ClaimRescissionsAndDenials
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 First Lien Pool Claim Severity + References No definition available. + Details
Name: | rdn_FirstLienPoolClaimSeverity
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This concept represents the calculated amount of claim paid by the original loan amount which represents the severity of the claim. The main determinants of the severity of a claim are the size of the loan, the amount of insurance coverage placed on the loan and the impact of loss mitigation activities. + References No definition available. + Details
Name: | rdn_FirstLienPrimaryClaimSeverity
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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 The assumption percentage used in our reserve calculation related to reinstatements of previously denied claims (sliding scale of percentages based on number of months due to customer's obligation to perfect the claim within a 12 month timeframe). + References No definition available. + Details
Name: | rdn_GrossReinstatementPercentageAssumptionForDeniedClaims
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The assumption percentage used in our reserve calculation related to reinstatements of previously curtailed claims over the previous twenty four months. + References No definition available. + Details
Name: | rdn_GrossReinstatementPercentageAssumptiononClaimCurtailments
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The assumption percentage used in our reserve calculation related to reinstatements of previously rescinded policies (sliding scale of percentages based on number of months due to customer's obligation to submit appropriate documentation or take other action within a 24 month timeframe). + References No definition available. + Details
Name: | rdn_GrossReinstatementPercentageAssumptionOnRescindedPolicies
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Impact To Loss Reserves Based On One Percentage Change in Default To Claim Rate + References No definition available. + Details
Name: | rdn_ImpactToLossReservesBasedOnOnePercentageChangeInDefaultToClaimRate
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Impact To Loss Reserves Based On One Percentage Change In Pool Claim Severity + References No definition available. + Details
Name: | rdn_ImpactToLossReservesBasedOnOnePercentageChangeInPoolClaimSeverity
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Impact To Loss Reserves Based On One Percentage Change In Primary Claim Severity + References No definition available. + Details
Name: | rdn_ImpactToLossReservesBasedOnOnePercentageChangeInPrimaryClaimSeverity
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This concept represents the increase to our loss reserve estimate related to our assumption for future reinstatements of previously rescinded policies and denied claims which are primarily reflected in the IBNR reserve estimate. + References No definition available. + Details
Name: | rdn_IncreaseToOurLossReservesDueToEstimatedFutureReinstatementsOfPreviouslyRescindedPoliciesAndDeniedClaims
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 Number of Months That the Gross Reinstatement Rate Used in Estimating Claim Liability Declines + References No definition available. + Details
Name: | rdn_NumberOfMonthsThatGrossReinstatementRateUsedInEstimatingClaimLiabilityDeclines
Namespace Prefix: | rdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition This concept represents a number of servicers with which the entity is in settlement discussions with at the reporting date. + References No definition available. + Details
Name: | rdn_NumberofServicersWithWhichtheEntityisinSettlementDiscussionsWith
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Point Change In Severity Used In Assumption Shift Analysis + References No definition available. + Details
Name: | rdn_PercentagePointChangeInSeverityUsedInAssumptionShiftAnalysis
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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. + References No definition available. + Details
Name: | rdn_Rescissions
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition The concept represents the rate at which defaulted loans are expected to result in claim net of denials, rescissions and reinstatements. + References No definition available. + Details
Name: | rdn_WeightedAverageDefaultToClaimRateAssumptionNetOfDenialsRescissionsAndReinstatements
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
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