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Long-Duration Insurance Contracts - Separate Account Liability Rollforward (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Separate Account, Liability [Roll Forward] |  |
Balance, beginning of year | $ 3,708.8 |
Balance, end of period | 4,088.3 | $ 3,708.8
Variable Account Annuities |  |
Separate Account, Liability [Roll Forward] |  |
Balance, beginning of year | 3,708.8 | 3,294.1
Deposits | 218.8 | 266.2
Withdrawals | (220.6) | (290.3)
Net transfers | (23.0) | (21.1)
Fees and charges | (41.6) | (53.3)
Market appreciation (depreciation) | 445.9 | 513.2
Other | 0.0 | 0.0
Balance, end of period | $ 4,088.3 | $ 3,708.8

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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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