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Contractholder Funds (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | $ 25,574.7 | $ 25,322.2 |
Investment contracts without significant fee revenue | 15,677.6 | 15,784.5 |
Embedded derivatives | 230.0 | 115.5 |
Other balances | 199.0 | 278.9 |
Total contract holder funds per consolidated statements of financial position | 41,681.3 | 41,501.1 |
Retirement and Income Solutions |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | 19,031.5 | 18,774.0 |
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 | 13,293.9 | 12,721.5 | $ 12,154.7
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 | 838.0 | 514.2 | 381.4
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 | 4,899.6 | 5,538.3 | 7,228.3
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 | 6,896.2 | 6,910.4 | $ 6,947.9
Corporate | Inter-segment eliminations |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | $ (353.0) | $ (362.2) |

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