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LIABILITIES FOR INSURANCE PRODUCTS - RECONCILIATION OF LIABILITY FOR POLICYHOLDER ACCOUNT BALANCES (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Policyholder Account Balance [Line Items]      
Balance $ 16,637.9 $ 15,667.8 $ 15,387.7
Fixed indexed annuities      
Policyholder Account Balance [Line Items]      
Balance 10,409.5   9,852.6
Fixed interest annuities      
Policyholder Account Balance [Line Items]      
Balance 2,164.9   2,249.0
Other annuities      
Policyholder Account Balance [Line Items]      
Balance 132.9   142.0
Interest-sensitive life      
Policyholder Account Balance [Line Items]      
Balance 1,386.9   1,335.7
Funding agreements      
Policyholder Account Balance [Line Items]      
Balance 2,163.9   1,410.9
Other      
Policyholder Account Balance [Line Items]      
Balance $ 379.8   $ 397.5