v3.26.1
LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF CHANGES IN LIABILITY FOR FUTURE POLICY BENEFITS (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 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     $ (29.6) $ (75.5)
Adjusted beginning of period PVENP     9,945.2 9,551.4
Issuances 826.5 705.2    
Interest accrual 220.7 206.3    
Net premiums collected (714.7) (693.0)    
Ending PVENP at original discount rate 10,277.7 9,769.9    
Effect of changes in discount rate assumptions, end of period (361.5) (345.7)    
PVENP, end of period 9,916.2 9,424.2    
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     (53.3) (101.7)
Adjusted beginning of period PVEFPB     19,842.8 19,349.0
Issuances 829.0 710.9    
Interest accrual 464.6 448.1    
Benefit payments (877.0) (865.9)    
Ending PVEFPB at original discount rate 20,259.4 19,642.1    
Effect of changes in discount rate assumptions, end of period (914.5) (903.3)    
PVEFPB, end of period 19,344.9 18,738.8    
Net liability for future policy benefits 9,428.7 9,314.6    
Flooring impact 1.3 0.7    
Adjusted net liability for future policy benefits 9,430.0 9,315.3    
Related reinsurance recoverable (536.6) (538.3)    
Net liability for future policy benefits, net of reinsurance recoverable 8,893.4 8,777.0    
Adjusted net liability for future policy benefits 9,430.0 9,315.3    
Reserves excluded from rollforward 2,256.9 2,374.9    
Deferred liability 72.7 69.7    
Future loss reserves 25.1 27.8    
Future policy benefits 11,784.7 11,787.7 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     14.6 (46.8)
Adjusted beginning of period PVENP     2,767.9 2,777.1
Issuances 132.1 171.5    
Interest accrual 61.3 61.6    
Net premiums collected (175.5) (178.7)    
Ending PVENP at original discount rate 2,785.8 2,831.5    
Effect of changes in discount rate assumptions, end of period (136.1) (138.2)    
PVENP, end of period 2,649.7 2,693.3    
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     18.1 (52.8)
Adjusted beginning of period PVEFPB     6,361.5 6,292.0
Issuances 132.2 174.6    
Interest accrual 147.2 146.3    
Benefit payments (212.9) (216.4)    
Ending PVEFPB at original discount rate 6,428.0 6,396.5    
Effect of changes in discount rate assumptions, end of period (426.3) (441.6)    
PVEFPB, end of period 6,001.7 5,954.9    
Net liability for future policy benefits 3,352.0 3,261.6    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,352.0 3,261.6    
Related reinsurance recoverable (1.6) (1.3)    
Net liability for future policy benefits, net of reinsurance recoverable 3,350.4 3,260.3    
Adjusted net liability for future policy benefits 3,352.0 3,261.6    
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     30.0 51.6
Adjusted beginning of period PVENP     3,803.1 3,408.7
Issuances 419.2 253.5    
Interest accrual 83.8 71.1    
Net premiums collected (255.0) (230.1)    
Ending PVENP at original discount rate 4,051.1 3,503.2    
Effect of changes in discount rate assumptions, end of period (148.7) (133.3)    
PVENP, end of period 3,902.4 3,369.9    
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     30.9 57.7
Adjusted beginning of period PVEFPB     4,015.5 3,644.8
Issuances 419.3 253.6    
Interest accrual 88.7 76.2    
Benefit payments (268.4) (252.8)    
Ending PVEFPB at original discount rate 4,255.1 3,721.8    
Effect of changes in discount rate assumptions, end of period (160.1) (144.4)    
PVEFPB, end of period 4,095.0 3,577.4    
Net liability for future policy benefits 192.6 207.5    
Flooring impact 1.3 0.7    
Adjusted net liability for future policy benefits 193.9 208.2    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable 193.9 208.2    
Adjusted net liability for future policy benefits 193.9 208.2    
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     (26.3) (26.0)
Adjusted beginning of period PVENP     1,165.5 1,102.5
Issuances 89.8 84.1    
Interest accrual 28.0 26.4    
Net premiums collected (85.2) (82.2)    
Ending PVENP at original discount rate 1,198.1 1,130.8    
Effect of changes in discount rate assumptions, end of period (10.3) (6.3)    
PVENP, end of period 1,187.8 1,124.5    
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     (44.5) (37.1)
Adjusted beginning of period PVEFPB     4,375.2 4,297.1
Issuances 89.9 84.2    
Interest accrual 115.5 114.0    
Benefit payments (145.1) (144.8)    
Ending PVEFPB at original discount rate 4,435.5 4,350.5    
Effect of changes in discount rate assumptions, end of period (65.2) (49.8)    
PVEFPB, end of period 4,370.3 4,300.7    
Net liability for future policy benefits 3,182.5 3,176.2    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 3,182.5 3,176.2    
Related reinsurance recoverable (385.4) (373.0)    
Net liability for future policy benefits, net of reinsurance recoverable 2,797.1 2,803.2    
Adjusted net liability for future policy benefits 3,182.5 3,176.2    
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     (47.9) (54.3)
Adjusted beginning of period PVENP     2,208.7 2,263.1
Issuances 181.9 193.3    
Interest accrual 47.6 47.2    
Net premiums collected (195.5) (199.2)    
Ending PVENP at original discount rate 2,242.7 2,304.4    
Effect of changes in discount rate assumptions, end of period (66.4) (67.9)    
PVENP, end of period 2,176.3 2,236.5    
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     (57.3) (71.1)
Adjusted beginning of period PVEFPB     4,820.0 4,832.8
Issuances 184.1 195.6    
Interest accrual 106.9 105.2    
Benefit payments (235.5) (237.7)    
Ending PVEFPB at original discount rate 4,875.5 4,895.9    
Effect of changes in discount rate assumptions, end of period (249.1) (253.5)    
PVEFPB, end of period 4,626.4 4,642.4    
Net liability for future policy benefits 2,450.1 2,405.9    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 2,450.1 2,405.9    
Related reinsurance recoverable (149.6) (164.0)    
Net liability for future policy benefits, net of reinsurance recoverable 2,300.5 2,241.9    
Adjusted net liability for future policy benefits 2,450.1 2,405.9    
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 actual variances from expected experience     0.0 0.0
Adjusted beginning of period PVENP     0.0 0.0
Issuances 3.5 2.8    
Interest accrual 0.0 0.0    
Net premiums collected (3.5) (2.8)    
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     (0.5) 1.6
Adjusted beginning of period PVEFPB     $ 270.6 $ 282.3
Issuances 3.5 2.9    
Interest accrual 6.3 6.4    
Benefit payments (15.1) (14.2)    
Ending PVEFPB at original discount rate 265.3 277.4    
Effect of changes in discount rate assumptions, end of period (13.8) (14.0)    
PVEFPB, end of period 251.5 263.4    
Net liability for future policy benefits 251.5 263.4    
Flooring impact 0.0 0.0    
Adjusted net liability for future policy benefits 251.5 263.4    
Related reinsurance recoverable 0.0 0.0    
Net liability for future policy benefits, net of reinsurance recoverable 251.5 263.4    
Adjusted net liability for future policy benefits $ 251.5 $ 263.4