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Contractholder Funds (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Contract holder Funds      
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue $ 26,184.4 $ 26,349.6  
Investment contracts without significant fee revenue 16,374.4 16,104.0  
Embedded derivatives 55.5 46.4  
Other balances 343.7 325.3  
Total contract holder funds per consolidated statements of financial position 42,958.0 42,825.3  
Retirement and Income Solutions      
Contract holder Funds      
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue 19,628.4 19,764.4  
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 12,476.6 12,154.7 $ 10,996.2
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 366.1 381.4 380.9
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 6,785.7 7,228.3 9,646.3
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 6,915.4 6,947.9 $ 6,962.5
Corporate | Inter-segment eliminations      
Contract holder Funds      
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue $ (359.4) $ (362.7)