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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF CHANGES IN LIABILITY FOR FUTURE POLICY BENEFITS (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 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 $ 11,479.4   $ 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     0.0 $ 0.0
Effect of actual variances from expected experience     (22.3) (26.8)
Adjusted beginning of period PVENP     2,782.7 2,942.9
Issuances 129.7 140.8    
Interest accrual 61.5 64.3    
Net premiums collected (173.0) (178.9)    
Ending PVENP at original discount rate 2,800.9 2,969.1    
Effect of changes in discount rate assumptions, end of period (180.3) (162.4)    
PVENP, end of period 2,620.6 2,806.7    
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     0.0 0.0
Effect of actual variances from expected experience     (26.0) (31.5)
Adjusted beginning of period PVEFPB     6,227.1 6,338.6
Issuances 130.0 141.2    
Interest accrual 145.3 148.1    
Benefit payments (222.5) (210.3)    
Ending PVEFPB at original discount rate 6,279.9 6,417.6    
Effect of changes in discount rate assumptions, end of period (497.6) (408.0)    
PVEFPB, end of period 5,782.3 6,009.6    
Net liability for future policy benefits 3,161.7 3,202.9    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,161.7 3,202.9    
Related reinsurance recoverable (1.5) (2.3)    
Net liability for future policy benefits, net of reinsurance recoverable 3,160.2 3,200.6    
Medicare supplement        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 3,009.2 2,800.6    
Effect of changes in discount rate assumptions, beginning of period 99.1 196.4    
Beginning PVENP at original discount rate 3,108.3 2,997.0    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (28.0) 17.3
Adjusted beginning of period PVENP     3,080.3 3,014.3
Issuances 226.3 166.5    
Interest accrual 65.0 60.9    
Net premiums collected (225.5) (219.5)    
Ending PVENP at original discount rate 3,146.1 3,022.2    
Effect of changes in discount rate assumptions, end of period (179.2) (177.0)    
PVENP, end of period 2,966.9 2,845.2    
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     0.0 0.0
Effect of actual variances from expected experience     (29.5) 28.2
Adjusted beginning of period PVEFPB     3,315.4 3,273.3
Issuances 226.3 166.5    
Interest accrual 70.2 66.3    
Benefit payments (239.5) (247.2)    
Ending PVEFPB at original discount rate 3,372.4 3,258.9    
Effect of changes in discount rate assumptions, end of period (194.9) (190.9)    
PVEFPB, end of period 3,177.5 3,068.0    
Net liability for future policy benefits 210.6 222.8    
Flooring impact 1.0 0.2    
Adjusted net liability for future policy benefits 211.6 223.0    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable 211.6 223.0    
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     0.0 0.0
Effect of actual variances from expected experience     (9.3) 12.1
Adjusted beginning of period PVENP     1,038.7 1,069.4
Issuances 94.2 30.0    
Interest accrual 26.0 24.6    
Net premiums collected (79.4) (81.0)    
Ending PVENP at original discount rate 1,079.5 1,043.0    
Effect of changes in discount rate assumptions, end of period (24.6) (19.6)    
PVENP, end of period 1,054.9 1,023.4    
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     0.0 0.0
Effect of actual variances from expected experience     (20.2) 19.5
Adjusted beginning of period PVEFPB     4,211.6 4,206.1
Issuances 94.3 30.0    
Interest accrual 113.6 111.3    
Benefit payments (147.9) (142.8)    
Ending PVEFPB at original discount rate 4,271.6 4,204.6    
Effect of changes in discount rate assumptions, end of period (69.7) 10.3    
PVEFPB, end of period 4,201.9 4,214.9    
Net liability for future policy benefits 3,147.0 3,191.5    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,147.0 3,191.5    
Related reinsurance recoverable (354.6) (356.6)    
Net liability for future policy benefits, net of reinsurance recoverable 2,792.4 2,834.9    
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     0.0 0.0
Effect of actual variances from expected experience     (38.1) (25.5)
Adjusted beginning of period PVENP     2,309.1 2,286.6
Issuances 207.9 209.4    
Interest accrual 48.9 46.4    
Net premiums collected (202.3) (202.1)    
Ending PVENP at original discount rate 2,363.6 2,340.3    
Effect of changes in discount rate assumptions, end of period (123.5) (120.7)    
PVENP, end of period 2,240.1 2,219.6    
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     0.0 0.0
Effect of actual variances from expected experience     (44.8) (30.8)
Adjusted beginning of period PVEFPB     4,820.8 4,723.7
Issuances 210.0 212.7    
Interest accrual 106.1 102.5    
Benefit payments (229.7) (222.9)    
Ending PVEFPB at original discount rate 4,907.2 4,816.0    
Effect of changes in discount rate assumptions, end of period (337.4) (290.8)    
PVEFPB, end of period 4,569.8 4,525.2    
Net liability for future policy benefits 2,329.7 2,305.6    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 2,329.7 2,305.6    
Related reinsurance recoverable (181.2) (194.3)    
Net liability for future policy benefits, net of reinsurance recoverable 2,148.5 2,111.3    
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 2.3 3.1    
Interest accrual 0.0 0.0    
Net premiums collected (2.3) (3.1)    
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     (14.2) 1.0
Adjusted beginning of period PVEFPB     $ 297.7 $ 327.3
Issuances 2.2 3.2    
Interest accrual 7.0 7.4    
Benefit payments (15.7) (17.3)    
Ending PVEFPB at original discount rate 291.2 320.6    
Effect of changes in discount rate assumptions, end of period (9.9) (11.6)    
PVEFPB, end of period 281.3 309.0    
Net liability for future policy benefits 281.3 309.0    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 281.3 309.0    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable $ 281.3 $ 309.0