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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF CHANGES IN LIABILITY FOR FUTURE POLICY BENEFITS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Net liability for future policy benefits $ 11,705.5 $ 12,188.4  
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) $ (145.0)
Effect of actual variances from expected experience   (3.6) (57.2)
Adjusted beginning of period PVENP   2,773.0 2,767.5
Issuances 275.2 261.3  
Interest accrual 124.0 127.4  
Net premiums collected (348.3) (351.2)  
Ending PVENP at original discount rate 2,823.9 2,805.0  
Effect of changes in discount rate assumptions, end of period (180.0) (86.8)  
PVENP, end of period 2,643.9 2,718.2  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
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) (187.0)
Effect of actual variances from expected experience   (3.8) (65.8)
Adjusted beginning of period PVEFPB   6,210.1 6,117.3
Issuances 275.9 261.7  
Interest accrual 291.9 295.0  
Benefit payments (433.1) (420.9)  
Ending PVEFPB at original discount rate 6,344.8 6,253.1  
Effect of changes in discount rate assumptions, end of period (516.6) (229.8)  
PVEFPB, end of period 5,828.2 6,023.3  
Net liability for future policy benefits 3,184.3 3,305.1  
Flooring impact 0.0 0.0  
Adjusted net liability for future policy benefits 3,184.3 3,305.1  
Related reinsurance recoverable (1.4) (1.3)  
Net liability for future policy benefits, net of reinsurance recoverable 3,182.9 3,303.8  
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   89.8 76.0
Effect of actual variances from expected experience   71.2 20.1
Adjusted beginning of period PVENP   3,269.3 3,093.1
Issuances 406.9 328.8  
Interest accrual 133.8 123.3  
Net premiums collected (452.9) (436.9)  
Ending PVENP at original discount rate 3,357.1 3,108.3  
Effect of changes in discount rate assumptions, end of period (195.2) (99.1)  
PVENP, end of period 3,161.9 3,009.2  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
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   99.8 86.5
Effect of actual variances from expected experience   77.5 30.3
Adjusted beginning of period PVEFPB   3,522.2 3,361.9
Issuances 403.3 328.9  
Interest accrual 144.2 133.9  
Benefit payments (482.6) (479.8)  
Ending PVEFPB at original discount rate 3,587.1 3,344.9  
Effect of changes in discount rate assumptions, end of period (211.5) (108.3)  
PVEFPB, end of period 3,375.6 3,236.6  
Net liability for future policy benefits 213.7 227.4  
Flooring impact 0.6 0.5  
Adjusted net liability for future policy benefits 214.3 227.9  
Related reinsurance recoverable 0.0 0.0  
Net liability for future policy benefits, net of reinsurance recoverable 214.3 227.9  
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 (32.1)
Effect of actual variances from expected experience   (11.3) 33.4
Adjusted beginning of period PVENP   1,046.3 1,058.6
Issuances 190.6 98.7  
Interest accrual 53.4 49.9  
Net premiums collected (161.8) (159.2)  
Ending PVENP at original discount rate 1,128.5 1,048.0  
Effect of changes in discount rate assumptions, end of period (25.7) 7.6  
PVENP, end of period 1,102.8 1,055.6  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
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 (39.0)
Effect of actual variances from expected experience   (32.4) 47.2
Adjusted beginning of period PVEFPB   4,207.6 4,194.8
Issuances 190.9 99.4  
Interest accrual 228.7 223.9  
Benefit payments (293.0) (286.3)  
Ending PVEFPB at original discount rate 4,334.2 4,231.8  
Effect of changes in discount rate assumptions, end of period (94.1) 132.8  
PVEFPB, end of period 4,240.1 4,364.6  
Net liability for future policy benefits 3,137.3 3,309.0  
Flooring impact 0.0 0.0  
Adjusted net liability for future policy benefits 3,137.3 3,309.0  
Related reinsurance recoverable (360.8) (366.6)  
Net liability for future policy benefits, net of reinsurance recoverable 2,776.5 2,942.4  
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   (20.0) 33.0
Effect of actual variances from expected experience   (76.4) (71.0)
Adjusted beginning of period PVENP   2,250.8 2,274.1
Issuances 371.8 378.2  
Interest accrual 97.9 94.0  
Net premiums collected (403.1) (399.1)  
Ending PVENP at original discount rate 2,317.4 2,347.2  
Effect of changes in discount rate assumptions, end of period (113.5) (67.6)  
PVENP, end of period 2,203.9 2,279.6  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
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) 34.5
Effect of actual variances from expected experience   (91.8) (86.9)
Adjusted beginning of period PVEFPB   4,753.1 4,702.1
Issuances 380.8 388.4  
Interest accrual 213.0 206.7  
Benefit payments (443.0) (431.6)  
Ending PVEFPB at original discount rate 4,903.9 4,865.6  
Effect of changes in discount rate assumptions, end of period (333.3) (170.9)  
PVEFPB, end of period 4,570.6 4,694.7  
Net liability for future policy benefits 2,366.7 2,415.1  
Flooring impact 0.0 0.0  
Adjusted net liability for future policy benefits 2,366.7 2,415.1  
Related reinsurance recoverable (168.1) (194.2)  
Net liability for future policy benefits, net of reinsurance recoverable 2,198.6 2,220.9  
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 5.1 6.9  
Interest accrual 0.0 0.0  
Net premiums collected (5.1) (6.9)  
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]      
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 (3.5)
Effect of actual variances from expected experience   (17.9) 2.3
Adjusted beginning of period PVEFPB   294.0 $ 325.1
Issuances 4.9 7.0  
Interest accrual 13.6 14.8  
Benefit payments (31.8) (35.0)  
Ending PVEFPB at original discount rate 280.7 311.9  
Effect of changes in discount rate assumptions, end of period (16.2) (3.0)  
PVEFPB, end of period 264.5 308.9  
Net liability for future policy benefits 264.5 308.9  
Flooring impact 0.0 0.0  
Adjusted net liability for future policy benefits 264.5 308.9  
Related reinsurance recoverable 0.0 0.0  
Net liability for future policy benefits, net of reinsurance recoverable $ 264.5 $ 308.9