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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, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period $ 9,112.5 $ 9,062.5    
Effect of changes in discount rate assumptions, beginning of period 514.4 246.0    
Beginning PVENP at original discount rate 9,626.9 9,308.5    
Effect of changes in cash flow assumptions     $ 152.8 $ 46.3
Effect of actual variances from expected experience     (128.2) (41.9)
Adjusted beginning of period PVENP     9,651.5 9,312.9
Issuances 1,022.3 887.6    
Interest accrual 311.8 304.2    
Net premiums collected (1,038.4) (1,025.2)    
Ending PVENP at original discount rate 9,947.2 9,479.5    
Effect of changes in discount rate assumptions, end of period (235.4) (140.6)    
PVENP, end of period 9,711.8 9,338.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 18,279.0 18,628.1    
Effect of changes in discount rate assumptions, beginning of period 1,171.7 379.2    
Beginning PVEFPB at original discount rate 19,450.7 19,007.3    
Effect of changes in cash flow assumptions     129.6 43.5
Effect of actual variances from expected experience     (162.7) (77.7)
Adjusted beginning of period PVEFPB     19,417.6 18,973.1
Issuances 1,030.9 890.1    
Interest accrual 674.2 665.4    
Benefit payments (1,288.6) (1,271.9)    
Ending PVEFPB at original discount rate 19,834.1 19,256.7    
Effect of changes in discount rate assumptions, end of period (593.1) (200.3)    
PVEFPB, end of period 19,241.0 19,056.4    
Net liability for future policy benefits 9,529.2 9,717.5    
Flooring impact 0.9 0.5    
Adjusted net liability for future policy benefits 9,530.1 9,718.0    
Related reinsurance recoverable (550.5) (564.8)    
Net liability for future policy benefits, net of reinsurance recoverable 8,979.6 9,153.2    
Adjusted net liability for future policy benefits 9,530.1 9,718.0    
Reserves excluded from rollforward 2,351.3 2,445.4    
Deferred liability 69.2 67.4    
Future loss reserves 24.9 27.4    
Future policy benefits 11,975.5 12,258.2 11,705.5  
Supplemental health        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 2,643.9 2,718.2    
Effect of changes in discount rate assumptions, beginning of period 180.0 86.8    
Beginning PVENP at original discount rate 2,823.9 2,805.0    
Effect of changes in cash flow assumptions     (63.2) (28.4)
Effect of actual variances from expected experience     (54.6) 11.7
Adjusted beginning of period PVENP     2,706.1 2,788.3
Issuances 230.3 202.1    
Interest accrual 91.7 92.7    
Net premiums collected (264.7) (260.3)    
Ending PVENP at original discount rate 2,763.4 2,822.8    
Effect of changes in discount rate assumptions, end of period (96.8) (57.3)    
PVENP, end of period 2,666.6 2,765.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 5,828.2 6,023.3    
Effect of changes in discount rate assumptions, beginning of period 516.6 229.8    
Beginning PVEFPB at original discount rate 6,344.8 6,253.1    
Effect of changes in cash flow assumptions     (87.2) (39.2)
Effect of actual variances from expected experience     (61.8) 16.4
Adjusted beginning of period PVEFPB     6,195.8 6,230.3
Issuances 233.6 202.5    
Interest accrual 218.6 218.4    
Benefit payments (319.0) (329.1)    
Ending PVEFPB at original discount rate 6,329.0 6,322.1    
Effect of changes in discount rate assumptions, end of period (317.0) (172.8)    
PVEFPB, end of period 6,012.0 6,149.3    
Net liability for future policy benefits 3,345.4 3,383.8    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,345.4 3,383.8    
Related reinsurance recoverable (1.7) (1.5)    
Net liability for future policy benefits, net of reinsurance recoverable 3,343.7 3,382.3    
Adjusted net liability for future policy benefits 3,345.4 3,383.8    
Medicare supplement        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 3,161.9 3,009.1    
Effect of changes in discount rate assumptions, beginning of period 195.2 99.2    
Beginning PVENP at original discount rate 3,357.1 3,108.3    
Effect of changes in cash flow assumptions     182.7 85.2
Effect of actual variances from expected experience     44.2 10.6
Adjusted beginning of period PVENP     3,584.0 3,204.1
Issuances 354.3 243.5    
Interest accrual 109.0 98.5    
Net premiums collected (345.7) (337.3)    
Ending PVENP at original discount rate 3,701.6 3,208.8    
Effect of changes in discount rate assumptions, end of period (104.8) (64.8)    
PVENP, end of period 3,596.8 3,144.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 3,375.6 3,236.6    
Effect of changes in discount rate assumptions, beginning of period 211.5 108.3    
Beginning PVEFPB at original discount rate 3,587.1 3,344.9    
Effect of changes in cash flow assumptions     192.0 95.2
Effect of actual variances from expected experience     51.0 11.3
Adjusted beginning of period PVEFPB     3,830.1 3,451.4
Issuances 354.5 239.9    
Interest accrual 116.6 106.3    
Benefit payments (379.6) (360.2)    
Ending PVEFPB at original discount rate 3,921.6 3,437.4    
Effect of changes in discount rate assumptions, end of period (113.6) (71.5)    
PVEFPB, end of period 3,808.0 3,365.9    
Net liability for future policy benefits 211.2 221.9    
Flooring impact 0.9 0.5    
Adjusted net liability for future policy benefits 212.1 222.4    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable 212.1 222.4    
Adjusted net liability for future policy benefits 212.1 222.4    
Long-term care        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 1,102.8 1,055.6    
Effect of changes in discount rate assumptions, beginning of period 25.7 (7.6)    
Beginning PVENP at original discount rate 1,128.5 1,048.0    
Effect of changes in cash flow assumptions     31.0 9.6
Effect of actual variances from expected experience     (28.3) (8.9)
Adjusted beginning of period PVENP     1,131.2 1,048.7
Issuances 135.4 145.0    
Interest accrual 40.1 39.6    
Net premiums collected (124.7) (119.9)    
Ending PVENP at original discount rate 1,182.0 1,113.4    
Effect of changes in discount rate assumptions, end of period 7.1 17.1    
PVENP, end of period 1,189.1 1,130.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 4,240.1 4,364.6    
Effect of changes in discount rate assumptions, beginning of period 94.1 (132.8)    
Beginning PVEFPB at original discount rate 4,334.2 4,231.8    
Effect of changes in cash flow assumptions     25.8 8.2
Effect of actual variances from expected experience     (42.6) (23.2)
Adjusted beginning of period PVEFPB     4,317.4 4,216.8
Issuances 135.5 145.2    
Interest accrual 171.4 171.0    
Benefit payments (219.3) (222.0)    
Ending PVEFPB at original discount rate 4,405.0 4,311.0    
Effect of changes in discount rate assumptions, end of period 26.5 159.0    
PVEFPB, end of period 4,431.5 4,470.0    
Net liability for future policy benefits 3,242.4 3,339.5    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,242.4 3,339.5    
Related reinsurance recoverable (386.5) (384.6)    
Net liability for future policy benefits, net of reinsurance recoverable 2,855.9 2,954.9    
Adjusted net liability for future policy benefits 3,242.4 3,339.5    
Traditional life        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 2,203.9 2,279.6    
Effect of changes in discount rate assumptions, beginning of period 113.5 67.6    
Beginning PVENP at original discount rate 2,317.4 2,347.2    
Effect of changes in cash flow assumptions     2.3 (20.1)
Effect of actual variances from expected experience     (89.5) (55.3)
Adjusted beginning of period PVENP     2,230.2 2,271.8
Issuances 297.2 292.6    
Interest accrual 71.0 73.4    
Net premiums collected (298.2) (303.3)    
Ending PVENP at original discount rate 2,300.2 2,334.5    
Effect of changes in discount rate assumptions, end of period (40.9) (35.6)    
PVENP, end of period 2,259.3 2,298.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 4,570.6 4,694.7    
Effect of changes in discount rate assumptions, beginning of period 333.3 170.9    
Beginning PVEFPB at original discount rate 4,903.9 4,865.6    
Effect of changes in cash flow assumptions     1.8 (20.7)
Effect of actual variances from expected experience     (111.7) (65.7)
Adjusted beginning of period PVEFPB     4,794.0 4,779.2
Issuances 302.2 298.0    
Interest accrual 158.0 159.4    
Benefit payments (348.6) (336.7)    
Ending PVEFPB at original discount rate 4,905.6 4,899.9    
Effect of changes in discount rate assumptions, end of period (180.0) (113.7)    
PVEFPB, end of period 4,725.6 4,786.2    
Net liability for future policy benefits 2,466.3 2,487.3    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 2,466.3 2,487.3    
Related reinsurance recoverable (162.3) (178.7)    
Net liability for future policy benefits, net of reinsurance recoverable 2,304.0 2,308.6    
Adjusted net liability for future policy benefits 2,466.3 2,487.3    
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 5.1 4.4    
Interest accrual 0.0 0.0    
Net premiums collected (5.1) (4.4)    
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 264.5 308.9    
Effect of changes in discount rate assumptions, beginning of period 16.2 3.0    
Beginning PVEFPB at original discount rate 280.7 311.9    
Effect of changes in cash flow assumptions     (2.8) 0.0
Effect of actual variances from expected experience     2.4 (16.5)
Adjusted beginning of period PVEFPB     $ 280.3 $ 295.4
Issuances 5.1 4.5    
Interest accrual 9.6 10.3    
Benefit payments (22.1) (23.9)    
Ending PVEFPB at original discount rate 272.9 286.3    
Effect of changes in discount rate assumptions, end of period (9.0) (1.3)    
PVEFPB, end of period 263.9 285.0    
Net liability for future policy benefits 263.9 285.0    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 263.9 285.0    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable 263.9 285.0    
Adjusted net liability for future policy benefits $ 263.9 $ 285.0