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Contractholder Funds - Guaranteed Minimum Interest Rate (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Excess of crediting rates over GMIR      
Total policyholder account value $ 26,760.3 $ 25,322.2  
Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Total policyholder account value 20,191.1 18,774.0  
Workplace savings and retirement solutions | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 12,125.1 10,733.0  
Policyholder account value without GMIR 1,857.7 1,988.5  
Total policyholder account value 13,982.8 12,721.5 $ 12,154.7
Workplace savings and retirement solutions | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,486.9 1,423.9  
Workplace savings and retirement solutions | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 4,783.3 7,166.5  
Workplace savings and retirement solutions | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 5,833.4 2,118.3  
Workplace savings and retirement solutions | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 7.6 7.4  
Workplace savings and retirement solutions | 4.01% and above | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 13.9 16.9  
Workplace savings and retirement solutions | At GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 3,753.1 5,516.4  
Workplace savings and retirement solutions | At GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 3,727.0 5,135.0  
Workplace savings and retirement solutions | At GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 4.6 357.1  
Workplace savings and retirement solutions | At GMIR | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 7.6 7.4  
Workplace savings and retirement solutions | At GMIR | 4.01% and above | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 13.9 16.9  
Workplace savings and retirement solutions | Up to 0.50% above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 186.9 7.2  
Workplace savings and retirement solutions | Up to 0.50% above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR   3.3  
Workplace savings and retirement solutions | Up to 0.50% above GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR   3.8  
Workplace savings and retirement solutions | Up to 0.50% above GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 186.9 0.1  
Workplace savings and retirement solutions | 0.51% to 1.00% above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1.8 1,255.7  
Workplace savings and retirement solutions | 0.51% to 1.00% above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR   101.8  
Workplace savings and retirement solutions | 0.51% to 1.00% above GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR   1,153.1  
Workplace savings and retirement solutions | 0.51% to 1.00% above GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1.8 0.8  
Workplace savings and retirement solutions | 1.01% to 2.00% above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 4,998.0 1,065.1  
Workplace savings and retirement solutions | 1.01% to 2.00% above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,041.7 1,006.0  
Workplace savings and retirement solutions | 1.01% to 2.00% above GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,056.3    
Workplace savings and retirement solutions | 1.01% to 2.00% above GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2,900.0 59.1  
Workplace savings and retirement solutions | 2.01% or more above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 3,185.3 2,888.6  
Workplace savings and retirement solutions | 2.01% or more above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 445.2 312.8  
Workplace savings and retirement solutions | 2.01% or more above GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR   874.6  
Workplace savings and retirement solutions | 2.01% or more above GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 2,740.1 $ 1,701.2  
Workplace savings and retirement solutions | Minimum | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 1.01% 1.01%  
Workplace savings and retirement solutions | Minimum | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 2.01% 2.01%  
Workplace savings and retirement solutions | Minimum | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 3.01% 3.01%  
Workplace savings and retirement solutions | Minimum | 4.01% and above | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 4.01% 4.01%  
Workplace savings and retirement solutions | Maximum | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 1.00% 1.00%  
Workplace savings and retirement solutions | Maximum | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 2.00% 2.00%  
Workplace savings and retirement solutions | Maximum | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 3.00% 3.00%  
Workplace savings and retirement solutions | Maximum | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 4.00% 4.00%  
Individual variable annuities | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 254.5 $ 300.7  
Policyholder account value without GMIR 1,491.5 213.5  
Total policyholder account value 1,746.0 514.2 381.4
Individual variable annuities | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 19.2 22.6  
Individual variable annuities | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 3.8 4.6  
Individual variable annuities | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 231.5 273.5  
Individual variable annuities | At GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 254.5 300.7  
Individual variable annuities | At GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 19.2 22.6  
Individual variable annuities | At GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 3.8 4.6  
Individual variable annuities | At GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 231.5 $ 273.5  
Individual variable annuities | Minimum | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 1.01% 1.01%  
Individual variable annuities | Minimum | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 2.01% 2.01%  
Individual variable annuities | Minimum | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 3.01% 3.01%  
Individual variable annuities | Minimum | 4.01% and above | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 4.01% 4.01%  
Individual variable annuities | Maximum | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 1.00% 1.00%  
Individual variable annuities | Maximum | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 2.00% 2.00%  
Individual variable annuities | Maximum | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 3.00% 3.00%  
Individual variable annuities | Maximum | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 4.00% 4.00%  
Individual fixed deferred annuities | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 4,284.6 $ 5,300.1  
Policyholder account value without GMIR 177.7 238.2  
Total policyholder account value 4,462.3 5,538.3 7,228.3
Individual fixed deferred annuities | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,586.7 1,991.6  
Individual fixed deferred annuities | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 139.5 253.9  
Individual fixed deferred annuities | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2,416.4 2,897.7  
Individual fixed deferred annuities | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 142.0 156.9  
Individual fixed deferred annuities | At GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2,850.3 3,460.9  
Individual fixed deferred annuities | At GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 213.1 305.5  
Individual fixed deferred annuities | At GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 78.8 100.8  
Individual fixed deferred annuities | At GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2,416.4 2,897.7  
Individual fixed deferred annuities | At GMIR | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 142.0 156.9  
Individual fixed deferred annuities | Up to 0.50% above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 27.8 116.3  
Individual fixed deferred annuities | Up to 0.50% above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 27.5 115.4  
Individual fixed deferred annuities | Up to 0.50% above GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 0.3 0.9  
Individual fixed deferred annuities | 0.51% to 1.00% above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 60.8 148.1  
Individual fixed deferred annuities | 0.51% to 1.00% above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 56.0 121.8  
Individual fixed deferred annuities | 0.51% to 1.00% above GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 4.8 26.3  
Individual fixed deferred annuities | 1.01% to 2.00% above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 245.1 572.9  
Individual fixed deferred annuities | 1.01% to 2.00% above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 196.9 449.4  
Individual fixed deferred annuities | 1.01% to 2.00% above GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 48.2 123.5  
Individual fixed deferred annuities | 2.01% or more above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,100.6 1,001.9  
Individual fixed deferred annuities | 2.01% or more above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,093.2 999.5  
Individual fixed deferred annuities | 2.01% or more above GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 7.4 $ 2.4  
Individual fixed deferred annuities | Minimum | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 1.01% 1.01%  
Individual fixed deferred annuities | Minimum | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 2.01% 2.01%  
Individual fixed deferred annuities | Minimum | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 3.01% 3.01%  
Individual fixed deferred annuities | Minimum | 4.01% and above | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 4.01% 4.01%  
Individual fixed deferred annuities | Maximum | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 1.00% 1.00%  
Individual fixed deferred annuities | Maximum | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 2.00% 2.00%  
Individual fixed deferred annuities | Maximum | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 3.00% 3.00%  
Individual fixed deferred annuities | Maximum | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 4.00% 4.00%  
Universal life | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 5,925.1 $ 6,067.7  
Policyholder account value without GMIR 1,005.3 842.7  
Total policyholder account value 6,930.4 6,910.4 $ 6,947.9
Universal life | Up to 1.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 21.3 19.5  
Universal life | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,663.5 1,613.2  
Universal life | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2,425.1 2,596.8  
Universal life | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,763.3 1,784.0  
Universal life | 4.01% and above | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 51.9 54.2  
Universal life | At GMIR | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2,497.8 2,721.3  
Universal life | At GMIR | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 268.6 294.1  
Universal life | At GMIR | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 646.0 729.7  
Universal life | At GMIR | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,559.7 1,657.0  
Universal life | At GMIR | 4.01% and above | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 23.5 40.5  
Universal life | Up to 0.50% above GMIR | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 691.4 730.9  
Universal life | Up to 0.50% above GMIR | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 632.2 677.2  
Universal life | Up to 0.50% above GMIR | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 56.7 49.8  
Universal life | Up to 0.50% above GMIR | 4.01% and above | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2.5 3.9  
Universal life | 0.51% to 1.00% above GMIR | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,238.9 1,316.4  
Universal life | 0.51% to 1.00% above GMIR | Up to 1.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1.5 16.1  
Universal life | 0.51% to 1.00% above GMIR | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 424.0 418.1  
Universal life | 0.51% to 1.00% above GMIR | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 771.9 836.3  
Universal life | 0.51% to 1.00% above GMIR | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 34.5 37.6  
Universal life | 0.51% to 1.00% above GMIR | 4.01% and above | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 7.0 8.3  
Universal life | 1.01% to 2.00% above GMIR | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,026.5 875.1  
Universal life | 1.01% to 2.00% above GMIR | Up to 1.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 14.9 1.0  
Universal life | 1.01% to 2.00% above GMIR | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 518.6 485.6  
Universal life | 1.01% to 2.00% above GMIR | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 368.7 350.6  
Universal life | 1.01% to 2.00% above GMIR | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 105.4 36.4  
Universal life | 1.01% to 2.00% above GMIR | 4.01% and above | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 18.9 1.5  
Universal life | 2.01% or more above GMIR | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 470.5 424.0  
Universal life | 2.01% or more above GMIR | Up to 1.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 4.9 2.4  
Universal life | 2.01% or more above GMIR | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 452.3 415.4  
Universal life | 2.01% or more above GMIR | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 6.3 3.0  
Universal life | 2.01% or more above GMIR | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 7.0 $ 3.2  
Universal life | Minimum | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 1.01% 1.01%  
Universal life | Minimum | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 2.01% 2.01%  
Universal life | Minimum | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 3.01% 3.01%  
Universal life | Minimum | 4.01% and above | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 4.01% 4.01%  
Universal life | Maximum | Up to 1.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 1.00% 1.00%  
Universal life | Maximum | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 2.00% 2.00%  
Universal life | Maximum | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 3.00% 3.00%  
Universal life | Maximum | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 4.00% 4.00%