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Future Policy Benefits and Claims - Retirement and Income Solutions (Details) - Retirement and Income Solutions - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension risk transfer |  |  |
Present value of expected future policy benefit payments |  |  |
Balance at beginning of period, Present value of expected future policy benefit payments | $ 21,211.4 | $ 25,365.8 | $ 25,863.7
Effect of changes in discount rate assumptions at beginning of period | 1,799.6 | (3,386.5) | (4,827.9)
Balance at beginning of period at original discount rate | 23,011.0 | 21,979.3 | 21,035.8
Effect of changes in cash flow assumptions | (53.4) | (7.9) |
Effect of actual variances from expected experience | (14.6) | (3.2) | (2.4)
Adjusted beginning of period balance at original discount rate | 22,943.0 | 21,968.2 | 21,033.4
Interest accrual | 1,008.6 | 935.7 | 916.7
Benefit payments | (1,981.4) | (1,841.7) | (1,772.5)
Issuances | 2,921.7 | 1,948.8 | 1,801.7
Balance at end of period at original discount rate | 24,891.9 | 23,011.0 | 21,979.3
Effect of changes in discount rate assumptions at end of period | (1,036.1) | (1,799.6) | 3,386.5
Balance at end of period, Present value of expected future policy benefit payments | 23,855.8 | 21,211.4 | 25,365.8
Future policy benefits after reinsurance | $ 23,855.8 | $ 21,211.4 |
Weighted-average duration for future policy benefits (in years) | 8 years 6 months | 8 years 6 months |
Increase (decrease) to LFPB due to effect of changes in discount rate assumptions | $ 763.5 | $ (5,186.1) |
Individual fixed income annuities |  |  |
Present value of expected future policy benefit payments |  |  |
Balance at beginning of period, Present value of expected future policy benefit payments | 5,019.4 | 6,535.0 | 7,145.8
Effect of changes in discount rate assumptions at beginning of period | 439.0 | (812.6) | (1,213.5)
Balance at beginning of period at original discount rate | 5,458.4 | 5,722.4 | 5,932.3
Effect of changes in cash flow assumptions | (1.3) | (3.0) |
Effect of actual variances from expected experience | (0.1) |  | (1.3)
Adjusted beginning of period balance at original discount rate | 5,457.0 | 5,719.4 | 5,931.0
Interest accrual | 219.1 | 229.7 | 240.5
Benefit payments | (507.3) | (520.4) | (532.0)
Issuances | 42.0 | 29.7 | 82.9
Balance at end of period at original discount rate | 5,210.8 | 5,458.4 | 5,722.4
Effect of changes in discount rate assumptions at end of period | (296.7) | (439.0) | 812.6
Balance at end of period, Present value of expected future policy benefit payments | 4,914.1 | 5,019.4 | $ 6,535.0
Reinsurance Impact | (4,869.1) | (5,002.7) |
Future policy benefits after reinsurance | $ 45.0 | $ 16.7 |
Weighted-average duration for future policy benefits (in years) | 7 years 10 months 24 days | 7 years 10 months 24 days |
Increase (decrease) to LFPB due to effect of changes in discount rate assumptions | $ 142.3 | $ (1,251.6) |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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