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Reinsurance - Excess-of-Loss Program (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2021 | Apr. 30, 2021 | Feb. 29, 2020 | Apr. 30, 2019 | Nov. 30, 2018 | Dec. 31, 2022 | Dec. 31, 2021
Mortgage insurance |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
RIF |  |  |  |  |  | $ 66,100.0 | $ 60,900.0
Excess-of-Loss Program | Radian Guaranty | Eagle Re 2021-1 Ltd. (2) | Radian Group Inc. |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | 45.4 |
Excess-of-Loss Program | Mortgage insurance | Radian Guaranty | Eagle Re 2021-2 Ltd. |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
RIF | $ 10,758.0 |  |  |  |  | 9,150.0 | 10,379.0
Coverage | 484.0 |  |  |  |  | 472.0 | 484.0
Excess-of-Loss Program | Mortgage insurance | Radian Guaranty | Eagle Re 2021-1 Ltd. (2) |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
RIF |  | $ 11,061.0 |  |  |  | 7,758.0 | 9,496.0
Coverage |  | 498.0 |  |  |  | 366.0 | 498.0
Excess-of-Loss Program | Mortgage insurance | Radian Guaranty | Eagle Re 2020-1 Ltd. |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
RIF |  |  | $ 9,866.0 |  |  | 2,401.0 | 3,241.0
Coverage |  |  | 488.0 |  |  | 368.0 | 488.0
Excess-of-Loss Program | Mortgage insurance | Radian Guaranty | Eagle Re 2019-1 Ltd. |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
RIF |  |  |  | $ 10,705.0 |  | 1,769.0 | 2,429.0
Coverage |  |  |  | 562.0 |  | 385.0 | 385.0
Excess-of-Loss Program | Mortgage insurance | Radian Guaranty | Eagle Re 2018-1 Ltd. |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
RIF |  |  |  |  | $ 9,109.0 | 1,509.0 | 2,117.0
Coverage |  |  |  |  | 434.0 | 276.0 | 276.0
Excess-of-Loss Program | XOL First Layer | Mortgage insurance | Radian Guaranty | Eagle Re 2021-2 Ltd. |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
First layer retention | $ 242.0 |  |  |  |  | 242.0 | 242.0
Excess-of-Loss Program | XOL First Layer | Mortgage insurance | Radian Guaranty | Eagle Re 2021-1 Ltd. (2) |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
First layer retention |  | $ 221.0 |  |  |  | 221.0 | 221.0
Excess-of-Loss Program | XOL First Layer | Mortgage insurance | Radian Guaranty | Eagle Re 2020-1 Ltd. |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
First layer retention |  |  | $ 202.0 |  |  | 202.0 | 202.0
Excess-of-Loss Program | XOL First Layer | Mortgage insurance | Radian Guaranty | Eagle Re 2019-1 Ltd. |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
First layer retention |  |  |  | $ 268.0 |  | 263.0 | 264.0
Excess-of-Loss Program | XOL First Layer | Mortgage insurance | Radian Guaranty | Eagle Re 2018-1 Ltd. |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
First layer retention |  |  |  |  | $ 205.0 | $ 200.0 | $ 201.0

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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 + Details
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- Definition Amount per life of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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- Definition Amount per life of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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