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Contractholder Funds (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | $ 28,769.4 | $ 26,760.3 |
Investment contracts without significant fee revenue | 14,818.8 | 15,805.8 |
Embedded derivatives and other balances | 833.2 | 533.5 |
Total contractholder funds per consolidated statements of financial position | 44,421.4 | 43,099.6 |
Retirement and Income Solutions |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | 22,258.1 | 20,191.1 |
Retirement and Income Solutions | Workplace savings and retirement solutions |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | 15,077.2 | 13,982.8 | $ 12,721.5
Retirement and Income Solutions | Individual variable annuities |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | 3,252.7 | 1,746.0 | 514.2
Retirement and Income Solutions | Individual fixed deferred annuities |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | 3,928.2 | 4,462.3 | 5,538.3
Benefits and Protection | Life Insurance | Universal life |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | 6,863.1 | 6,930.4 | $ 6,910.4
Corporate | Inter-segment eliminations |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | $ (351.8) | $ (361.2) |

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- Definition Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(14)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A + Details
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