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Long-Duration Insurance Contracts - Separate Account Liability Rollforward (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Separate Account, Liability [Roll Forward] |  |
Balance, beginning of year | $ 3,294.1 |
Balance, end of period | 3,732.8 | $ 3,294.1
Variable Account Annuities |  |
Separate Account, Liability [Roll Forward] |  |
Balance, beginning of year | 3,294.1 | 2,792.3
Deposits | 195.1 | 234.2
Withdrawals | (210.9) | (213.4)
Net transfers | (15.0) | (15.5)
Fees and charges | (39.0) | (37.6)
Market appreciation (depreciation) | 508.5 | 541.5
Other | 0.0 | (7.4)
Balance, end of period | $ 3,732.8 | $ 3,294.1

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- Definition Amount of increase (decrease) in separate account liability from performance of investment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-18 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480109/944-80-50-2 + Details
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