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Note 16 - Statutory Information Segregated Funds Held for Others (Details) $ in Millions | Sep. 30, 2018 USD ($)
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Segregated Funds Held for Others [Abstract] |
Amounts held in escrow | $ 6.1

X
- Definition The amount as of the balance sheet date of deposits from our customers held in escrow at third party financial institutions and that is excluded from assets and liabilities in the consolidated balance sheets. + References No definition available. + Details
Name: | rdn_SegregatedFundsHeldforOthers
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Segregated Funds Held for Others [Abstract] + References No definition available. + Details
Name: | rdn_SegregatedFundsHeldforOthersAbstract
Namespace Prefix: | rdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration