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Reinsurance - Components of Net Realized Capital Gains (Losses) on Funds Withheld Assets (Details) - Talcott Life & Annuity Re - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Reinsurance |  |  |  |
Net realized capital gains (losses) | $ (73.3) | $ 101.8 | $ (128.7) | $ 101.8
Fixed maturities, available-for-sale |  |  |  |
Reinsurance |  |  |  |
Net realized capital gains (losses) | (66.6) | 113.9 | (123.6) | 113.9
Fixed maturities, trading |  |  |  |
Reinsurance |  |  |  |
Net realized capital gains (losses) |  | (0.8) | (0.1) | (0.8)
Equity securities |  |  |  |
Reinsurance |  |  |  |
Net realized capital gains (losses) |  | (2.8) | (1.2) | (2.8)
Mortgage loans |  |  |  |
Reinsurance |  |  |  |
Net realized capital gains (losses) | (9.2) | (1.6) | (9.2) | (1.6)
Derivatives |  |  |  |
Reinsurance |  |  |  |
Net realized capital gains (losses) | $ 2.5 | (0.5) | $ 5.4 | (0.5)
Other |  |  |  |
Reinsurance |  |  |  |
Net realized capital gains (losses) |  | $ (6.4) |  | $ (6.4)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of the realized capital gains (losses) on reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder. + References No definition available. + Details
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