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Long-Duration Insurance Contracts - Separate Account Liability Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Separate Account, Liability [Roll Forward] |  |  |  |
Balance, beginning of year | [1] | $ 2,792.3 |  |
Balance, end of period |  | 3,294.1 | $ 2,792.3 | [1]
Variable Account Annuities |  |  |  |
Separate Account, Liability [Roll Forward] |  |  |  |
Balance, beginning of year |  | 2,792.3 | 3,441.0 |
Deposits |  | 234.2 | 240.3 |
Withdrawals |  | (213.4) | (186.8) |
Net transfers |  | (15.5) | (38.1) |
Fees and charges |  | (37.6) | (36.8) |
Market appreciation (depreciation) |  | 541.5 | (619.7) |
Other |  | (7.4) | (7.6) |
Balance, end of period |  | $ 3,294.1 | $ 2,792.3 |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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