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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, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Net liability for future policy benefits $ 12,179.6   $ 11,928.2  
Supplemental health        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 2,718.2 $ 2,781.3    
Effect of changes in discount rate assumptions, beginning of period 86.8 188.4    
Beginning PVENP at original discount rate 2,805.0 2,969.7    
Effect of changes in cash flow assumptions     (28.4) $ 0.0
Effect of actual variances from expected experience     11.7 (40.9)
Adjusted beginning of period PVENP     2,788.3 2,928.8
Issuances 202.1 205.1    
Interest accrual 92.7 96.7    
Net premiums collected (260.3) (267.0)    
Ending PVENP at original discount rate 2,822.8 2,963.6    
Effect of changes in discount rate assumptions, end of period (57.3) (295.1)    
PVENP, end of period 2,765.5 2,668.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 6,023.3 5,886.8    
Effect of changes in discount rate assumptions, beginning of period 229.8 483.3    
Beginning PVEFPB at original discount rate 6,253.1 6,370.1    
Effect of changes in cash flow assumptions     (39.2) 0.0
Effect of actual variances from expected experience     16.4 (46.9)
Adjusted beginning of period PVEFPB     6,230.3 6,323.2
Issuances 202.5 205.3    
Interest accrual 218.4 222.6    
Benefit payments (329.1) (314.2)    
Ending PVEFPB at original discount rate 6,322.1 6,436.9    
Effect of changes in discount rate assumptions, end of period (172.8) (801.6)    
PVEFPB, end of period 6,149.3 5,635.3    
Net liability for future policy benefits 3,383.8 2,966.8    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,383.8 2,966.8    
Related reinsurance recoverable (1.5) (1.3)    
Net liability for future policy benefits, net of reinsurance recoverable 3,382.3 2,965.5    
Medicare supplement        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 3,009.1 2,800.6    
Effect of changes in discount rate assumptions, beginning of period 99.2 196.4    
Beginning PVENP at original discount rate 3,108.3 2,997.0    
Effect of changes in cash flow assumptions     85.2 0.0
Effect of actual variances from expected experience     10.6 (4.2)
Adjusted beginning of period PVENP     3,204.1 2,992.8
Issuances 243.5 238.9    
Interest accrual 98.5 91.3    
Net premiums collected (337.3) (324.5)    
Ending PVENP at original discount rate 3,208.8 2,998.5    
Effect of changes in discount rate assumptions, end of period (64.8) (274.1)    
PVENP, end of period 3,144.0 2,724.4    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 3,236.6 3,033.1    
Effect of changes in discount rate assumptions, beginning of period 108.3 212.0    
Beginning PVEFPB at original discount rate 3,344.9 3,245.1    
Effect of changes in cash flow assumptions     95.2 0.0
Effect of actual variances from expected experience     11.3 7.4
Adjusted beginning of period PVEFPB     3,451.4 3,252.5
Issuances 239.9 238.9    
Interest accrual 106.3 99.3    
Benefit payments (360.2) (362.1)    
Ending PVEFPB at original discount rate 3,437.4 3,228.6    
Effect of changes in discount rate assumptions, end of period (71.5) (295.5)    
PVEFPB, end of period 3,365.9 2,933.1    
Net liability for future policy benefits 221.9 208.7    
Flooring impact 0.5 0.2    
Adjusted net liability for future policy benefits 222.4 208.9    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable 222.4 208.9    
Long-term care        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 1,055.6 1,034.1    
Effect of changes in discount rate assumptions, beginning of period (7.6) 23.2    
Beginning PVENP at original discount rate 1,048.0 1,057.3    
Effect of changes in cash flow assumptions     9.6 0.0
Effect of actual variances from expected experience     (8.9) 20.7
Adjusted beginning of period PVENP     1,048.7 1,078.0
Issuances 145.0 56.3    
Interest accrual 39.6 37.1    
Net premiums collected (119.9) (120.6)    
Ending PVENP at original discount rate 1,113.4 1,050.8    
Effect of changes in discount rate assumptions, end of period 17.1 (53.4)    
PVENP, end of period 1,130.5 997.4    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 4,364.6 4,158.1    
Effect of changes in discount rate assumptions, beginning of period (132.8) 28.5    
Beginning PVEFPB at original discount rate 4,231.8 4,186.6    
Effect of changes in cash flow assumptions     8.2 0.0
Effect of actual variances from expected experience     (23.2) 30.3
Adjusted beginning of period PVEFPB     4,216.8 4,216.9
Issuances 145.2 56.5    
Interest accrual 171.0 167.3    
Benefit payments (222.0) (214.0)    
Ending PVEFPB at original discount rate 4,311.0 4,226.7    
Effect of changes in discount rate assumptions, end of period 159.0 (252.1)    
PVEFPB, end of period 4,470.0 3,974.6    
Net liability for future policy benefits 3,339.5 2,977.2    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,339.5 2,977.2    
Related reinsurance recoverable (384.6) (330.4)    
Net liability for future policy benefits, net of reinsurance recoverable 2,954.9 2,646.8    
Traditional life        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 2,279.6 2,175.0    
Effect of changes in discount rate assumptions, beginning of period 67.6 137.1    
Beginning PVENP at original discount rate 2,347.2 2,312.1    
Effect of changes in cash flow assumptions     (20.1) 0.0
Effect of actual variances from expected experience     (55.3) (47.0)
Adjusted beginning of period PVENP     2,271.8 2,265.1
Issuances 292.6 300.7    
Interest accrual 73.4 70.0    
Net premiums collected (303.3) (301.5)    
Ending PVENP at original discount rate 2,334.5 2,334.3    
Effect of changes in discount rate assumptions, end of period (35.6) (188.6)    
PVENP, end of period 2,298.9 2,145.7    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 4,694.7 4,417.9    
Effect of changes in discount rate assumptions, beginning of period 170.9 336.6    
Beginning PVEFPB at original discount rate 4,865.6 4,754.5    
Effect of changes in cash flow assumptions     (20.7) 0.0
Effect of actual variances from expected experience     (65.7) (59.1)
Adjusted beginning of period PVEFPB     4,779.2 4,695.4
Issuances 298.0 307.8    
Interest accrual 159.4 154.3    
Benefit payments (336.7) (325.8)    
Ending PVEFPB at original discount rate 4,899.9 4,831.7    
Effect of changes in discount rate assumptions, end of period (113.7) (510.9)    
PVEFPB, end of period 4,786.2 4,320.8    
Net liability for future policy benefits 2,487.3 2,175.1    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 2,487.3 2,175.1    
Related reinsurance recoverable (178.7) (182.2)    
Net liability for future policy benefits, net of reinsurance recoverable 2,308.6 1,992.9    
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 4.4 4.7    
Interest accrual 0.0 0.0    
Net premiums collected (4.4) (4.7)    
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 308.9 310.9    
Effect of changes in discount rate assumptions, beginning of period 3.0 15.4    
Beginning PVEFPB at original discount rate 311.9 326.3    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (16.5) 1.8
Adjusted beginning of period PVEFPB     $ 295.4 $ 328.1
Issuances 4.5 4.7    
Interest accrual 10.3 11.1    
Benefit payments (23.9) (25.8)    
Ending PVEFPB at original discount rate 286.3 318.1    
Effect of changes in discount rate assumptions, end of period (1.3) (30.9)    
PVEFPB, end of period 285.0 287.2    
Net liability for future policy benefits 285.0 287.2    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 285.0 287.2    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable $ 285.0 $ 287.2