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Acquisitions - Acquisition of AMS Group (Details) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 01, 2018 | Jun. 30, 2019 | Dec. 31, 2018 | Mar. 31, 2019
Business Acquisition [Line Items] |  |  |  |
Goodwill acquired |  | $ 42 |  |
Assurant Mortgage Solutions Group |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets acquired |  |  | $ 24 |
Goodwill acquired |  |  | 13 |
Xome Holdings LLC | Assurant Mortgage Solutions Group |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration | $ 38 |  |  |
Contingent consideration |  |  | $ 15 | $ 4
Estimated consideration | 53 |  |  |
Intangible assets acquired | 24 |  |  |
Goodwill acquired | $ 13 |  |  |
Change in contingent consideration |  | $ 11 |  |

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