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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF CHANGES IN LIABILITY FOR FUTURE POLICY BENEFITS (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Net liability for future policy benefits $ 10,829.9   $ 11,240.2   $ 15,704.9
Supplemental health          
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]          
Present value of expected net premiums ("PVENP"), beginning of period 2,781.3 $ 3,496.8      
Effect of changes in discount rate assumptions, beginning of period 188.4 (525.6)      
Beginning PVENP at original discount rate 2,969.7 2,971.2      
Effect of changes in cash flow assumptions     0.0 $ 0.0  
Effect of actual variances from expected experience     (40.9) (24.0)  
Adjusted beginning of period PVENP     2,928.8 2,947.2  
Issuances 205.1 234.2      
Interest accrual 96.7 92.4      
Net premiums collected (267.0) (265.0)      
Ending PVENP at original discount rate 2,963.6 3,008.8      
Effect of changes in discount rate assumptions, end of period (295.1) (273.5)      
PVENP, end of period 2,668.5 2,735.3      
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Present value of expected future policy benefits ("PVEFPB"), beginning of period 5,886.8 7,688.0      
Effect of changes in discount rate assumptions, beginning of period 483.3 (1,414.8)      
Beginning PVEFPB at original discount rate 6,370.1 6,273.2      
Effect of changes in cash flow assumptions     0.0 0.0  
Effect of actual variances from expected experience     (46.9) (25.9)  
Adjusted beginning of period PVEFPB     6,323.2 6,247.3  
Issuances 205.3 234.7      
Interest accrual 222.6 216.3      
Benefit payments (314.2) (312.4)      
Ending PVEFPB at original discount rate 6,436.9 6,385.9      
Effect of changes in discount rate assumptions, end of period (801.6) (699.7)      
PVEFPB, end of period 5,635.3 5,686.2      
Net liability for future policy benefits 2,966.8 2,950.9      
Flooring impact 0.0 37.6      
Adjusted net liability for future policy benefits 2,966.8 2,988.5      
Related reinsurance recoverable (1.3) (3.0)      
Net liability for future policy benefits, net of reinsurance recoverable 2,965.5 2,985.5      
Medicare supplement          
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]          
Present value of expected net premiums ("PVENP"), beginning of period 2,800.6 3,454.0      
Effect of changes in discount rate assumptions, beginning of period 196.4 (341.8)      
Beginning PVENP at original discount rate 2,997.0 3,112.2      
Effect of changes in cash flow assumptions     0.0 0.0  
Effect of actual variances from expected experience     (4.2) (32.7)  
Adjusted beginning of period PVENP     2,992.8 3,079.5  
Issuances 238.9 204.7      
Interest accrual 91.3 88.3      
Net premiums collected (324.5) (346.3)      
Ending PVENP at original discount rate 2,998.5 3,026.2      
Effect of changes in discount rate assumptions, end of period (274.1) (260.3)      
PVENP, end of period 2,724.4 2,765.9      
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Present value of expected future policy benefits ("PVEFPB"), beginning of period 3,033.1 3,750.5      
Effect of changes in discount rate assumptions, beginning of period 212.0 (373.8)      
Beginning PVEFPB at original discount rate 3,245.1 3,376.7      
Effect of changes in cash flow assumptions     0.0 0.0  
Effect of actual variances from expected experience     7.4 (35.1)  
Adjusted beginning of period PVEFPB     3,252.5 3,341.6  
Issuances 238.9 204.0      
Interest accrual 99.3 96.7      
Benefit payments (362.1) (362.9)      
Ending PVEFPB at original discount rate 3,228.6 3,279.4      
Effect of changes in discount rate assumptions, end of period (295.5) (280.6)      
PVEFPB, end of period 2,933.1 2,998.8      
Net liability for future policy benefits 208.7 232.9      
Flooring impact 0.2 0.3      
Adjusted net liability for future policy benefits 208.9 233.2      
Related reinsurance recoverable 0.0 0.0      
Net liability for future policy benefits, net of reinsurance recoverable 208.9 233.2      
Long-term care          
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]          
Present value of expected net premiums ("PVENP"), beginning of period 1,034.1 1,313.4      
Effect of changes in discount rate assumptions, beginning of period 23.2 (183.2)      
Beginning PVENP at original discount rate 1,057.3 1,130.2      
Effect of changes in cash flow assumptions     0.0 0.0  
Effect of actual variances from expected experience     20.7 (14.5)  
Adjusted beginning of period PVENP     1,078.0 1,115.7  
Issuances 56.3 70.9      
Interest accrual 37.1 38.4      
Net premiums collected (120.6) (127.1)      
Ending PVENP at original discount rate 1,050.8 1,097.9      
Effect of changes in discount rate assumptions, end of period (53.4) (43.8)      
PVENP, end of period 997.4 1,054.1      
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Present value of expected future policy benefits ("PVEFPB"), beginning of period 4,158.1 5,501.6      
Effect of changes in discount rate assumptions, beginning of period 28.5 (1,291.2)      
Beginning PVEFPB at original discount rate 4,186.6 4,210.4      
Effect of changes in cash flow assumptions     0.0 0.0  
Effect of actual variances from expected experience     30.3 (23.7)  
Adjusted beginning of period PVEFPB     4,216.9 4,186.7  
Issuances 56.5 70.9      
Interest accrual 167.3 167.6      
Benefit payments (214.0) (198.1)      
Ending PVEFPB at original discount rate 4,226.7 4,227.1      
Effect of changes in discount rate assumptions, end of period (252.1) (157.7)      
PVEFPB, end of period 3,974.6 4,069.4      
Net liability for future policy benefits 2,977.2 3,015.3      
Flooring impact 0.0 16.3      
Adjusted net liability for future policy benefits 2,977.2 3,031.6      
Related reinsurance recoverable (330.4) (318.0)      
Net liability for future policy benefits, net of reinsurance recoverable 2,646.8 2,713.6      
Traditional life          
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]          
Present value of expected net premiums ("PVENP"), beginning of period 2,175.0 2,483.7      
Effect of changes in discount rate assumptions, beginning of period 137.1 (239.4)      
Beginning PVENP at original discount rate 2,312.1 2,244.3      
Effect of changes in cash flow assumptions     0.0 0.0  
Effect of actual variances from expected experience     (47.0) (43.6)  
Adjusted beginning of period PVENP     2,265.1 2,200.7  
Issuances 300.7 397.6      
Interest accrual 70.0 61.6      
Net premiums collected (301.5) (300.7)      
Ending PVENP at original discount rate 2,334.3 2,359.2      
Effect of changes in discount rate assumptions, end of period (188.6) (205.1)      
PVENP, end of period 2,145.7 2,154.1      
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Present value of expected future policy benefits ("PVEFPB"), beginning of period 4,417.9 5,395.7      
Effect of changes in discount rate assumptions, beginning of period 336.6 (767.3)      
Beginning PVEFPB at original discount rate 4,754.5 4,628.4      
Effect of changes in cash flow assumptions     0.0 0.0  
Effect of actual variances from expected experience     (59.1) (48.8)  
Adjusted beginning of period PVEFPB     4,695.4 4,579.6  
Issuances 307.8 407.6      
Interest accrual 154.3 144.4      
Benefit payments (325.8) (363.2)      
Ending PVEFPB at original discount rate 4,831.7 4,768.4      
Effect of changes in discount rate assumptions, end of period (510.9) (496.7)      
PVEFPB, end of period 4,320.8 4,271.7      
Net liability for future policy benefits 2,175.1 2,117.6      
Flooring impact 0.0 9.3      
Adjusted net liability for future policy benefits 2,175.1 2,126.9      
Related reinsurance recoverable (182.2) (196.1)      
Net liability for future policy benefits, net of reinsurance recoverable 1,992.9 1,930.8      
Other annuities          
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]          
Present value of expected net premiums ("PVENP"), beginning of period 0.0 0.0      
Effect of changes in discount rate assumptions, beginning of period 0.0 0.0      
Beginning PVENP at original discount rate 0.0 0.0      
Effect of changes in cash flow assumptions     0.0 0.0  
Effect of actual variances from expected experience     0.0 0.0  
Adjusted beginning of period PVENP     0.0 0.0  
Issuances 4.7 5.6      
Interest accrual 0.0 0.0      
Net premiums collected (4.7) (5.6)      
Ending PVENP at original discount rate 0.0 0.0      
Effect of changes in discount rate assumptions, end of period 0.0 0.0      
PVENP, end of period 0.0 0.0      
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Present value of expected future policy benefits ("PVEFPB"), beginning of period 310.9 431.9      
Effect of changes in discount rate assumptions, beginning of period 15.4 (88.4)      
Beginning PVEFPB at original discount rate 326.3 343.5      
Effect of changes in cash flow assumptions     0.0 0.0  
Effect of actual variances from expected experience     1.8 (4.1)  
Adjusted beginning of period PVEFPB     $ 328.1 $ 339.4  
Issuances 4.7 6.4      
Interest accrual 11.1 11.4      
Benefit payments (25.8) (27.4)      
Ending PVEFPB at original discount rate 318.1 329.8      
Effect of changes in discount rate assumptions, end of period (30.9) (25.3)      
PVEFPB, end of period 287.2 304.5      
Net liability for future policy benefits 287.2 304.5      
Flooring impact 0.0 0.0      
Adjusted net liability for future policy benefits 287.2 304.5      
Related reinsurance recoverable 0.0 0.0      
Net liability for future policy benefits, net of reinsurance recoverable $ 287.2 $ 304.5