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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF CHANGES IN LIABILITY FOR FUTURE POLICY BENEFITS (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period $ 9,717.6 $ 9,112.5    
Effect of changes in discount rate assumptions, beginning of period 257.2 514.4    
Beginning PVENP at original discount rate 9,974.8 9,626.9    
Effect of actual variances from expected experience     $ (18.3) $ (36.3)
Adjusted beginning of period PVENP     9,956.5 9,590.6
Issuances 476.3 402.1    
Interest accrual 110.0 103.1    
Net premiums collected (359.5) (348.9)    
Ending PVENP at original discount rate 10,183.3 9,746.9    
Effect of changes in discount rate assumptions, end of period (378.4) (412.5)    
PVENP, end of period 9,804.9 9,334.4    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 19,195.2 18,279.0    
Effect of changes in discount rate assumptions, beginning of period 700.9 1,171.7    
Beginning PVEFPB at original discount rate 19,896.1 19,450.7    
Effect of actual variances from expected experience     (24.9) (48.8)
Adjusted beginning of period PVEFPB     19,871.2 19,401.9
Issuances 476.3 405.3    
Interest accrual 231.9 223.9    
Benefit payments (433.8) (430.2)    
Ending PVEFPB at original discount rate 20,145.6 19,600.9    
Effect of changes in discount rate assumptions, end of period (1,005.0) (997.2)    
PVEFPB, end of period 19,140.6 18,603.7    
Net liability for future policy benefits 9,335.7 9,269.3    
Flooring impact 1.2 0.7    
Adjusted net liability for future policy benefits 9,336.9 9,270.0    
Related reinsurance recoverable (532.6) (535.7)    
Net liability for future policy benefits, net of reinsurance recoverable 8,804.3 8,734.3    
Adjusted net liability for future policy benefits 9,336.9 9,270.0    
Reserves excluded from rollforward 2,287.9 2,406.7    
Deferred liability 72.5 68.7    
Future loss reserves 24.9 27.6    
Future policy benefits 11,722.2 11,773.0 11,898.0  
Supplemental health        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 2,645.7 2,643.9    
Effect of changes in discount rate assumptions, beginning of period 107.6 180.0    
Beginning PVENP at original discount rate 2,753.3 2,823.9    
Effect of actual variances from expected experience     5.4 (19.4)
Adjusted beginning of period PVENP     2,758.7 2,804.5
Issuances 63.8 108.3    
Interest accrual 30.5 30.9    
Net premiums collected (87.5) (90.0)    
Ending PVENP at original discount rate 2,765.5 2,853.7    
Effect of changes in discount rate assumptions, end of period (144.3) (154.3)    
PVENP, end of period 2,621.2 2,699.4    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 5,984.2 5,828.2    
Effect of changes in discount rate assumptions, beginning of period 359.2 516.6    
Beginning PVEFPB at original discount rate 6,343.4 6,344.8    
Effect of actual variances from expected experience     6.2 (22.6)
Adjusted beginning of period PVEFPB     6,349.6 6,322.2
Issuances 63.8 111.2    
Interest accrual 73.4 73.2    
Benefit payments (102.9) (104.1)    
Ending PVEFPB at original discount rate 6,383.9 6,402.5    
Effect of changes in discount rate assumptions, end of period (462.3) (465.5)    
PVEFPB, end of period 5,921.6 5,937.0    
Net liability for future policy benefits 3,300.4 3,237.6    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,300.4 3,237.6    
Related reinsurance recoverable (1.7) (1.2)    
Net liability for future policy benefits, net of reinsurance recoverable 3,298.7 3,236.4    
Adjusted net liability for future policy benefits 3,300.4 3,237.6    
Medicare supplement        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 3,661.6 3,161.9    
Effect of changes in discount rate assumptions, beginning of period 111.5 195.2    
Beginning PVENP at original discount rate 3,773.1 3,357.1    
Effect of actual variances from expected experience     19.9 33.3
Adjusted beginning of period PVENP     3,793.0 3,390.4
Issuances 275.0 157.3    
Interest accrual 41.6 35.4    
Net premiums collected (129.4) (116.8)    
Ending PVENP at original discount rate 3,980.2 3,466.3    
Effect of changes in discount rate assumptions, end of period (157.4) (157.9)    
PVENP, end of period 3,822.8 3,308.4    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 3,864.0 3,375.6    
Effect of changes in discount rate assumptions, beginning of period 120.6 211.5    
Beginning PVEFPB at original discount rate 3,984.6 3,587.1    
Effect of actual variances from expected experience     23.3 34.7
Adjusted beginning of period PVEFPB     4,007.9 3,621.8
Issuances 275.0 157.4    
Interest accrual 44.0 37.9    
Benefit payments (132.8) (123.4)    
Ending PVEFPB at original discount rate 4,194.1 3,693.7    
Effect of changes in discount rate assumptions, end of period (168.4) (171.3)    
PVEFPB, end of period 4,025.7 3,522.4    
Net liability for future policy benefits 202.9 214.0    
Flooring impact 1.2 0.7    
Adjusted net liability for future policy benefits 204.1 214.7    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable 204.1 214.7    
Adjusted net liability for future policy benefits 204.1 214.7    
Long-term care        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 1,196.6 1,102.8    
Effect of changes in discount rate assumptions, beginning of period (4.8) 25.7    
Beginning PVENP at original discount rate 1,191.8 1,128.5    
Effect of actual variances from expected experience     (17.4) (17.8)
Adjusted beginning of period PVENP     1,174.4 1,110.7
Issuances 45.3 43.1    
Interest accrual 14.0 13.2    
Net premiums collected (42.3) (40.6)    
Ending PVENP at original discount rate 1,191.4 1,126.4    
Effect of changes in discount rate assumptions, end of period (10.4) (13.9)    
PVENP, end of period 1,181.0 1,112.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 4,409.2 4,240.1    
Effect of changes in discount rate assumptions, beginning of period 10.5 94.1    
Beginning PVEFPB at original discount rate 4,419.7 4,334.2    
Effect of actual variances from expected experience     (24.7) (20.8)
Adjusted beginning of period PVEFPB     4,395.0 4,313.4
Issuances 45.3 43.1    
Interest accrual 57.8 57.0    
Benefit payments (72.4) (73.0)    
Ending PVEFPB at original discount rate 4,425.7 4,340.5    
Effect of changes in discount rate assumptions, end of period (92.6) (60.9)    
PVEFPB, end of period 4,333.1 4,279.6    
Net liability for future policy benefits 3,152.1 3,167.1    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,152.1 3,167.1    
Related reinsurance recoverable (378.7) (368.1)    
Net liability for future policy benefits, net of reinsurance recoverable 2,773.4 2,799.0    
Adjusted net liability for future policy benefits 3,152.1 3,167.1    
Traditional life        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 2,213.7 2,203.9    
Effect of changes in discount rate assumptions, beginning of period 42.9 113.5    
Beginning PVENP at original discount rate 2,256.6 2,317.4    
Effect of actual variances from expected experience     (26.2) (32.4)
Adjusted beginning of period PVENP     2,230.4 2,285.0
Issuances 90.3 91.8    
Interest accrual 23.9 23.6    
Net premiums collected (98.4) (99.9)    
Ending PVENP at original discount rate 2,246.2 2,300.5    
Effect of changes in discount rate assumptions, end of period (66.3) (86.4)    
PVENP, end of period 2,179.9 2,214.1    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits ("PVEFPB"), beginning of period 4,677.8 4,570.6    
Effect of changes in discount rate assumptions, beginning of period 199.5 333.3    
Beginning PVEFPB at original discount rate 4,877.3 4,903.9    
Effect of actual variances from expected experience     (30.7) (40.7)
Adjusted beginning of period PVEFPB     4,846.6 4,863.2
Issuances 90.3 92.0    
Interest accrual 53.5 52.6    
Benefit payments (118.7) (122.5)    
Ending PVEFPB at original discount rate 4,871.7 4,885.3    
Effect of changes in discount rate assumptions, end of period (266.0) (283.0)    
PVEFPB, end of period 4,605.7 4,602.3    
Net liability for future policy benefits 2,425.8 2,388.2    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 2,425.8 2,388.2    
Related reinsurance recoverable (152.2) (166.4)    
Net liability for future policy benefits, net of reinsurance recoverable 2,273.6 2,221.8    
Adjusted net liability for future policy benefits 2,425.8 2,388.2    
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 actual variances from expected experience     0.0 0.0
Adjusted beginning of period PVENP     0.0 0.0
Issuances 1.9 1.6    
Interest accrual 0.0 0.0    
Net premiums collected (1.9) (1.6)    
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 260.0 264.5    
Effect of changes in discount rate assumptions, beginning of period 11.1 16.2    
Beginning PVEFPB at original discount rate 271.1 280.7    
Effect of actual variances from expected experience     1.0 0.6
Adjusted beginning of period PVEFPB     $ 272.1 $ 281.3
Issuances 1.9 1.6    
Interest accrual 3.2 3.2    
Benefit payments (7.0) (7.2)    
Ending PVEFPB at original discount rate 270.2 278.9    
Effect of changes in discount rate assumptions, end of period (15.7) (16.5)    
PVEFPB, end of period 254.5 262.4    
Net liability for future policy benefits 254.5 262.4    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 254.5 262.4    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable 254.5 262.4    
Adjusted net liability for future policy benefits $ 254.5 $ 262.4