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Note 17 - Commitments and Contingencies Contract Underwriting (Details) (Mortgage Insurance Segment, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Contract Underwriting [Line Items]  
Losses Paid For Contract Underwriting Remedies $ 14.4rdn_LossesPaidForContractUnderwritingRemedies
Provision For Contract underwriting Expense 11.7rdn_ProvisionForContractUnderwritingExpense
Reserve For Contract Underwriting Obligations 0.9rdn_ReserveForContractUnderwritingObligations
Legacy Portfolio [Member]  
Contract Underwriting [Line Items]  
Losses Paid For Contract Underwriting Remedies $ 11.2rdn_LossesPaidForContractUnderwritingRemedies
/ rdn_MortgageInsuranceVintageAxis
= rdn_LegacyPortfolioMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember