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Acquisitions - Acquisition of AMS Group (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 01, 2018 | Sep. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Mar. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  |  | $ 42,000,000 |  |
Assurant Mortgage Solutions Group |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired |  |  |  | $ 24,000,000 |
Goodwill acquired |  |  |  | 13,000,000 |
Xome Holdings LLC | Assurant Mortgage Solutions Group |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration | $ 38,000,000 |  |  |  |
Contingent consideration |  | $ 0 | 0 | $ 15,000,000 | $ 4,000,000
Estimated consideration | 53,000,000 |  |  |  |
Intangible assets acquired | 24,000,000 |  |  |  |
Goodwill acquired | $ 13,000,000 |  |  |  |
Change in contingent consideration |  | $ 4,000,000 | $ 15,000,000 |  |

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