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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF CHANGES IN POLICYHOLDER ACCOUNT BALANCES (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Jan. 01, 2021
Policyholder Account Balance [Roll Forward]        
Policyholder account balances $ 15,481.8 $ 15,079.7 $ 15,234.2 $ 12,367.7
Fixed indexed annuities        
Policyholder Account Balance [Roll Forward]        
Balance, beginning of period excluding contracts 100% ceded 9,490.4 8,681.0    
Issuances (funds collected from new business) 996.6 1,111.9    
Premiums received (premiums collected from inforce business) 0.3 0.2    
Policy charges (14.4) (10.4)    
Surrenders and withdrawals (538.4) (388.6)    
Benefit payments (185.0) (192.5)    
Interest credited 52.7 102.8    
Other 17.0 15.5    
Balance, end of period excluding contracts 100% ceded 9,819.2 9,319.9    
Balance, end of period for contracts 100% ceded 141.4 158.7    
Policyholder account balances 9,960.6 9,478.6    
Balance, end of period, reinsurance ceded (141.4) (158.7)    
Balance, end of period, net of reinsurance $ 9,819.2 $ 9,319.9    
Weighted average crediting rate 1.70% 1.40%    
Net amount at risk $ 0.0 $ 0.0    
Cash surrender value, net of reinsurance 9,152.8 8,684.3    
Fixed interest annuities        
Policyholder Account Balance [Roll Forward]        
Balance, beginning of period excluding contracts 100% ceded 1,663.1 1,806.1    
Issuances (funds collected from new business) 139.5 52.2    
Premiums received (premiums collected from inforce business) 2.1 2.9    
Policy charges (0.7) (0.6)    
Surrenders and withdrawals (124.7) (113.0)    
Benefit payments (80.8) (102.9)    
Interest credited 34.2 34.3    
Other (0.2) 0.3    
Balance, end of period excluding contracts 100% ceded 1,632.5 1,679.3    
Balance, end of period for contracts 100% ceded 602.2 644.4    
Policyholder account balances 2,234.7 2,323.7    
Balance, end of period, reinsurance ceded (602.2) (644.4)    
Balance, end of period, net of reinsurance $ 1,632.5 $ 1,679.3    
Weighted average crediting rate 2.80% 2.60%    
Net amount at risk $ 0.0 $ 0.0    
Cash surrender value, net of reinsurance 1,609.4 1,669.3    
Other annuities        
Policyholder Account Balance [Roll Forward]        
Balance, beginning of period excluding contracts 100% ceded 127.1 131.2    
Issuances (funds collected from new business) 0.0 0.0    
Premiums received (premiums collected from inforce business) 21.5 25.9    
Policy charges 0.0 0.0    
Surrenders and withdrawals (30.3) (26.0)    
Benefit payments (4.6) (4.3)    
Interest credited 1.8 1.8    
Other (0.3) 0.0    
Balance, end of period excluding contracts 100% ceded 115.2 128.6    
Balance, end of period for contracts 100% ceded 26.2 26.5    
Policyholder account balances 141.4 155.1    
Balance, end of period, reinsurance ceded (26.2) (26.5)    
Balance, end of period, net of reinsurance $ 115.2 $ 128.6    
Weighted average crediting rate 2.40% 2.20%    
Net amount at risk $ 0.0 $ 0.0    
Cash surrender value, net of reinsurance 115.2 128.6    
Interest-sensitive life        
Policyholder Account Balance [Roll Forward]        
Balance, beginning of period excluding contracts 100% ceded 1,209.6 1,163.9    
Issuances (funds collected from new business) 30.0 31.4    
Premiums received (premiums collected from inforce business) 152.4 143.5    
Policy charges (140.4) (135.4)    
Surrenders and withdrawals (24.3) (20.3)    
Benefit payments (19.6) (19.1)    
Interest credited 30.5 34.9    
Other (0.4) 0.0    
Balance, end of period excluding contracts 100% ceded 1,237.8 1,198.9    
Balance, end of period for contracts 100% ceded 107.0 114.0    
Policyholder account balances 1,344.8 1,312.9    
Balance, end of period, reinsurance ceded (125.2) (134.9)    
Balance, end of period, net of reinsurance $ 1,219.6 $ 1,178.0    
Weighted average crediting rate 4.00% 4.30%    
Net amount at risk $ 27,851.0 $ 26,029.5    
Cash surrender value, net of reinsurance 997.8 954.7    
Funding agreements        
Policyholder Account Balance [Roll Forward]        
Balance, beginning of period excluding contracts 100% ceded 1,410.8 502.0    
Issuances (funds collected from new business) 0.0 899.0    
Premiums received (premiums collected from inforce business) 0.0 0.0    
Policy charges 0.0 0.0    
Surrenders and withdrawals (24.2) (14.3)    
Benefit payments 0.0 0.0    
Interest credited 21.6 21.3    
Other 0.0 0.0    
Balance, end of period excluding contracts 100% ceded 1,408.2 1,408.0    
Balance, end of period for contracts 100% ceded 0.0 0.0    
Policyholder account balances 1,408.2 1,408.0    
Balance, end of period, reinsurance ceded 0.0 0.0    
Balance, end of period, net of reinsurance $ 1,408.2 $ 1,408.0    
Weighted average crediting rate 2.00% 2.00%    
Net amount at risk $ 0.0 $ 0.0    
Cash surrender value, net of reinsurance 0.0 0.0    
Other        
Policyholder Account Balance [Roll Forward]        
Balance, beginning of period excluding contracts 100% ceded 395.5 368.0    
Issuances (funds collected from new business) 0.0 0.0    
Premiums received (premiums collected from inforce business) 201.0 196.2    
Policy charges 0.0 0.0    
Surrenders and withdrawals (216.6) (175.4)    
Benefit payments (0.1) 0.0    
Interest credited 2.0 1.9    
Other 0.0 0.0    
Balance, end of period excluding contracts 100% ceded 381.8 390.7    
Balance, end of period for contracts 100% ceded 10.3 10.7    
Policyholder account balances 392.1 401.4    
Balance, end of period, reinsurance ceded (24.3) (25.2)    
Balance, end of period, net of reinsurance $ 367.8 $ 376.2    
Weighted average crediting rate 0.80% 0.80%    
Net amount at risk $ 0.0 $ 0.0    
Cash surrender value, net of reinsurance $ 367.8 $ 376.2