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Long-Duration Insurance Contracts - Separate Account Liability Rollforward (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Separate Account, Liability [Roll Forward] |  |
Balance, beginning of year | $ 2,792.3 |
Balance, end of period | 2,974.0 | $ 2,792.3
Variable Account Annuities |  |
Separate Account, Liability [Roll Forward] |  |
Balance, beginning of year | 2,792.3 | 3,441.0
Deposits | 173.9 | 240.3
Withdrawals | (163.3) | (186.8)
Net transfers | (11.1) | (38.1)
Fees and charges | (28.0) | (36.8)
Market appreciation (depreciation) | 215.6 | (619.7)
Other | (5.4) | (7.6)
Balance, end of period | $ 2,974.0 | $ 2,792.3

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- Definition Amount of cash inflow to separate account liability for cash received for deposit. + References Reference 1: 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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- 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/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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- Definition Amount of decrease in separate account liability from policy charge. + 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/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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