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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, 2025
Jun. 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 $ 9,062.6    
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     $ (75.5) $ (97.7)
Adjusted beginning of period PVENP     9,551.4 9,210.8
Issuances 705.2 660.4    
Interest accrual 206.3 201.4    
Net premiums collected (693.0) (682.5)    
Ending PVENP at original discount rate 9,769.9 9,390.1    
Effect of changes in discount rate assumptions, end of period (345.7) (507.6)    
PVENP, end of period 9,424.2 8,882.5    
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     (101.7) (134.7)
Adjusted beginning of period PVEFPB     19,349.0 18,872.6
Issuances 710.9 662.8    
Interest accrual 448.1 442.2    
Benefit payments (865.9) (855.3)    
Ending PVEFPB at original discount rate 19,642.1 19,122.3    
Effect of changes in discount rate assumptions, end of period (903.3) (1,109.5)    
PVEFPB, end of period 18,738.8 18,012.8    
Net liability for future policy benefits 9,314.6 9,130.3    
Flooring impact 0.7 1.0    
Adjusted net liability for future policy benefits 9,315.3 9,131.3    
Related reinsurance recoverable (538.3) (537.3)    
Net liability for future policy benefits, net of reinsurance recoverable 8,777.0 8,594.0    
Adjusted net liability for future policy benefits 9,315.3 9,131.3    
Reserves excluded from rollforward 2,374.9 2,465.9    
Deferred liability 69.7 66.8    
Future loss reserves 27.8 31.1    
Future policy benefits 11,787.7 11,695.1 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     (46.8) (22.3)
Adjusted beginning of period PVENP     2,777.1 2,782.7
Issuances 171.5 129.7    
Interest accrual 61.6 61.5    
Net premiums collected (178.7) (173.0)    
Ending PVENP at original discount rate 2,831.5 2,800.9    
Effect of changes in discount rate assumptions, end of period (138.2) (180.3)    
PVENP, end of period 2,693.3 2,620.6    
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     (52.8) (26.0)
Adjusted beginning of period PVEFPB     6,292.0 6,227.1
Issuances 174.6 130.0    
Interest accrual 146.3 145.3    
Benefit payments (216.4) (222.5)    
Ending PVEFPB at original discount rate 6,396.5 6,279.9    
Effect of changes in discount rate assumptions, end of period (441.6) (497.6)    
PVEFPB, end of period 5,954.9 5,782.3    
Net liability for future policy benefits 3,261.6 3,161.7    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,261.6 3,161.7    
Related reinsurance recoverable (1.3) (1.5)    
Net liability for future policy benefits, net of reinsurance recoverable 3,260.3 3,160.2    
Adjusted net liability for future policy benefits 3,261.6 3,161.7    
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     51.6 (28.0)
Adjusted beginning of period PVENP     3,408.7 3,080.3
Issuances 253.5 226.3    
Interest accrual 71.1 65.0    
Net premiums collected (230.1) (225.5)    
Ending PVENP at original discount rate 3,503.2 3,146.1    
Effect of changes in discount rate assumptions, end of period (133.3) (179.2)    
PVENP, end of period 3,369.9 2,966.9    
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     57.7 (29.5)
Adjusted beginning of period PVEFPB     3,644.8 3,315.4
Issuances 253.6 226.3    
Interest accrual 76.2 70.2    
Benefit payments (252.8) (239.5)    
Ending PVEFPB at original discount rate 3,721.8 3,372.4    
Effect of changes in discount rate assumptions, end of period (144.4) (194.9)    
PVEFPB, end of period 3,577.4 3,177.5    
Net liability for future policy benefits 207.5 210.6    
Flooring impact 0.7 1.0    
Adjusted net liability for future policy benefits 208.2 211.6    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable 208.2 211.6    
Adjusted net liability for future policy benefits 208.2 211.6    
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     (26.0) (9.3)
Adjusted beginning of period PVENP     1,102.5 1,038.7
Issuances 84.1 94.2    
Interest accrual 26.4 26.0    
Net premiums collected (82.2) (79.4)    
Ending PVENP at original discount rate 1,130.8 1,079.5    
Effect of changes in discount rate assumptions, end of period (6.3) (24.6)    
PVENP, end of period 1,124.5 1,054.9    
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     (37.1) (20.2)
Adjusted beginning of period PVEFPB     4,297.1 4,211.6
Issuances 84.2 94.3    
Interest accrual 114.0 113.6    
Benefit payments (144.8) (147.9)    
Ending PVEFPB at original discount rate 4,350.5 4,271.6    
Effect of changes in discount rate assumptions, end of period (49.8) (69.7)    
PVEFPB, end of period 4,300.7 4,201.9    
Net liability for future policy benefits 3,176.2 3,147.0    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,176.2 3,147.0    
Related reinsurance recoverable (373.0) (354.6)    
Net liability for future policy benefits, net of reinsurance recoverable 2,803.2 2,792.4    
Adjusted net liability for future policy benefits 3,176.2 3,147.0    
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     (54.3) (38.1)
Adjusted beginning of period PVENP     2,263.1 2,309.1
Issuances 193.3 207.9    
Interest accrual 47.2 48.9    
Net premiums collected (199.2) (202.3)    
Ending PVENP at original discount rate 2,304.4 2,363.6    
Effect of changes in discount rate assumptions, end of period (67.9) (123.5)    
PVENP, end of period 2,236.5 2,240.1    
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     (71.1) (44.8)
Adjusted beginning of period PVEFPB     4,832.8 4,820.8
Issuances 195.6 210.0    
Interest accrual 105.2 106.1    
Benefit payments (237.7) (229.7)    
Ending PVEFPB at original discount rate 4,895.9 4,907.2    
Effect of changes in discount rate assumptions, end of period (253.5) (337.4)    
PVEFPB, end of period 4,642.4 4,569.8    
Net liability for future policy benefits 2,405.9 2,329.7    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 2,405.9 2,329.7    
Related reinsurance recoverable (164.0) (181.2)    
Net liability for future policy benefits, net of reinsurance recoverable 2,241.9 2,148.5    
Adjusted net liability for future policy benefits 2,405.9 2,329.7    
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 2.8 2.3    
Interest accrual 0.0 0.0    
Net premiums collected (2.8) (2.3)    
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     1.6 (14.2)
Adjusted beginning of period PVEFPB     $ 282.3 $ 297.7
Issuances 2.9 2.2    
Interest accrual 6.4 7.0    
Benefit payments (14.2) (15.7)    
Ending PVEFPB at original discount rate 277.4 291.2    
Effect of changes in discount rate assumptions, end of period (14.0) (9.9)    
PVEFPB, end of period 263.4 281.3    
Net liability for future policy benefits 263.4 281.3    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 263.4 281.3    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable 263.4 281.3    
Adjusted net liability for future policy benefits $ 263.4 $ 281.3