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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, 2025
Mar. 31, 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 $ 9,062.6    
Effect of changes in discount rate assumptions, beginning of period 514.4 245.9    
Beginning PVENP at original discount rate 9,626.9 9,308.5    
Effect of actual variances from expected experience     $ (36.3) $ (83.3)
Adjusted beginning of period PVENP     9,590.6 9,225.2
Issuances 402.1 356.2    
Interest accrual 103.1 100.1    
Net premiums collected (348.9) (341.6)    
Ending PVENP at original discount rate 9,746.9 9,339.9    
Effect of changes in discount rate assumptions, end of period (412.5) (398.1)    
PVENP, end of period 9,334.4 8,941.8    
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 actual variances from expected experience     (48.8) (90.1)
Adjusted beginning of period PVEFPB     19,401.9 18,917.2
Issuances 405.3 356.3    
Interest accrual 223.9 220.6    
Benefit payments (430.2) (426.5)    
Ending PVEFPB at original discount rate 19,600.9 19,067.6    
Effect of changes in discount rate assumptions, end of period (997.2) (778.2)    
PVEFPB, end of period 18,603.7 18,289.4    
Net liability for future policy benefits 9,269.3 9,347.6    
Flooring impact 0.7 0.8    
Adjusted net liability for future policy benefits 9,270.0 9,348.4    
Related reinsurance recoverable (535.7) (549.6)    
Net liability for future policy benefits, net of reinsurance recoverable 8,734.3 8,798.8    
Adjusted net liability for future policy benefits 9,270.0 9,348.4    
Reserves excluded from rollforward 2,406.7 2,488.1    
Deferred liability 68.7 64.7    
Future loss reserves 27.6 31.0    
Future policy benefits 11,773.0 11,932.2 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 actual variances from expected experience     (19.4) (15.2)
Adjusted beginning of period PVENP     2,804.5 2,789.8
Issuances 108.3 66.0    
Interest accrual 30.9 30.7    
Net premiums collected (90.0) (86.9)    
Ending PVENP at original discount rate 2,853.7 2,799.6    
Effect of changes in discount rate assumptions, end of period (154.3) (139.1)    
PVENP, end of period 2,699.4 2,660.5    
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 actual variances from expected experience     (22.6) (17.7)
Adjusted beginning of period PVEFPB     6,322.2 6,235.4
Issuances 111.2 66.0    
Interest accrual 73.2 72.6    
Benefit payments (104.1) (105.6)    
Ending PVEFPB at original discount rate 6,402.5 6,268.4    
Effect of changes in discount rate assumptions, end of period (465.5) (371.4)    
PVEFPB, end of period 5,937.0 5,897.0    
Net liability for future policy benefits 3,237.6 3,236.5    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,237.6 3,236.5    
Related reinsurance recoverable (1.2) (1.5)    
Net liability for future policy benefits, net of reinsurance recoverable 3,236.4 3,235.0    
Adjusted net liability for future policy benefits 3,237.6 3,236.5    
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 3,009.2    
Effect of changes in discount rate assumptions, beginning of period 195.2 99.1    
Beginning PVENP at original discount rate 3,357.1 3,108.3    
Effect of actual variances from expected experience     33.3 (39.0)
Adjusted beginning of period PVENP     3,390.4 3,069.3
Issuances 157.3 134.2    
Interest accrual 35.4 32.2    
Net premiums collected (116.8) (114.4)    
Ending PVENP at original discount rate 3,466.3 3,121.3    
Effect of changes in discount rate assumptions, end of period (157.9) (145.5)    
PVENP, end of period 3,308.4 2,975.8    
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 actual variances from expected experience     34.7 (39.1)
Adjusted beginning of period PVEFPB     3,621.8 3,305.8
Issuances 157.4 134.2    
Interest accrual 37.9 34.9    
Benefit payments (123.4) (117.8)    
Ending PVEFPB at original discount rate 3,693.7 3,357.1    
Effect of changes in discount rate assumptions, end of period (171.3) (158.4)    
PVEFPB, end of period 3,522.4 3,198.7    
Net liability for future policy benefits 214.0 222.9    
Flooring impact 0.7 0.8    
Adjusted net liability for future policy benefits 214.7 223.7    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable 214.7 223.7    
Adjusted net liability for future policy benefits 214.7 223.7    
Long-term care        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present value of expected net premiums ("PVENP"), beginning of period 1,102.8 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 actual variances from expected experience     (17.8) (7.9)
Adjusted beginning of period PVENP     1,110.7 1,040.1
Issuances 43.1 46.9    
Interest accrual 13.2 12.9    
Net premiums collected (40.6) (39.5)    
Ending PVENP at original discount rate 1,126.4 1,060.4    
Effect of changes in discount rate assumptions, end of period (13.9) (11.5)    
PVENP, end of period 1,112.5 1,048.9    
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 actual variances from expected experience     (20.8) (12.1)
Adjusted beginning of period PVEFPB     4,313.4 4,219.7
Issuances 43.1 47.0    
Interest accrual 57.0 56.7    
Benefit payments (73.0) (74.2)    
Ending PVEFPB at original discount rate 4,340.5 4,249.2    
Effect of changes in discount rate assumptions, end of period (60.9) 25.5    
PVEFPB, end of period 4,279.6 4,274.7    
Net liability for future policy benefits 3,167.1 3,225.8    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,167.1 3,225.8    
Related reinsurance recoverable (368.1) (360.8)    
Net liability for future policy benefits, net of reinsurance recoverable 2,799.0 2,865.0    
Adjusted net liability for future policy benefits 3,167.1 3,225.8    
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 actual variances from expected experience     (32.4) (21.2)
Adjusted beginning of period PVENP     2,285.0 2,326.0
Issuances 91.8 108.2    
Interest accrual 23.6 24.3    
Net premiums collected (99.9) (99.9)    
Ending PVENP at original discount rate 2,300.5 2,358.6    
Effect of changes in discount rate assumptions, end of period (86.4) (102.0)    
PVENP, end of period 2,214.1 2,256.6    
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 actual variances from expected experience     (40.7) (22.0)
Adjusted beginning of period PVEFPB     4,863.2 4,843.6
Issuances 92.0 108.2    
Interest accrual 52.6 52.8    
Benefit payments (122.5) (120.7)    
Ending PVEFPB at original discount rate 4,885.3 4,883.9    
Effect of changes in discount rate assumptions, end of period (283.0) (263.8)    
PVEFPB, end of period 4,602.3 4,620.1    
Net liability for future policy benefits 2,388.2 2,363.5    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 2,388.2 2,363.5    
Related reinsurance recoverable (166.4) (187.3)    
Net liability for future policy benefits, net of reinsurance recoverable 2,221.8 2,176.2    
Adjusted net liability for future policy benefits 2,388.2 2,363.5    
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 1.6 0.9    
Interest accrual 0.0 0.0    
Net premiums collected (1.6) (0.9)    
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]        
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 actual variances from expected experience     0.6 0.8
Adjusted beginning of period PVEFPB     $ 281.3 $ 312.7
Issuances 1.6 0.9    
Interest accrual 3.2 3.6    
Benefit payments (7.2) (8.2)    
Ending PVEFPB at original discount rate 278.9 309.0    
Effect of changes in discount rate assumptions, end of period (16.5) (10.1)    
PVEFPB, end of period 262.4 298.9    
Net liability for future policy benefits 262.4 298.9    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 262.4 298.9    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable 262.4 298.9    
Adjusted net liability for future policy benefits $ 262.4 $ 298.9