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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, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Net liability for future policy benefits | $ 12,179.6 |  | $ 11,928.2 |
Supplemental health |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Present value of expected net premiums ("PVENP"), beginning of period | 2,718.2 | $ 2,781.3 |  |
Effect of changes in discount rate assumptions, beginning of period | 86.8 | 188.4 |  |
Beginning PVENP at original discount rate | 2,805.0 | 2,969.7 |  |
Effect of changes in cash flow assumptions |  |  | (28.4) | $ 0.0
Effect of actual variances from expected experience |  |  | 11.7 | (40.9)
Adjusted beginning of period PVENP |  |  | 2,788.3 | 2,928.8
Issuances | 202.1 | 205.1 |  |
Interest accrual | 92.7 | 96.7 |  |
Net premiums collected | (260.3) | (267.0) |  |
Ending PVENP at original discount rate | 2,822.8 | 2,963.6 |  |
Effect of changes in discount rate assumptions, end of period | (57.3) | (295.1) |  |
PVENP, end of period | 2,765.5 | 2,668.5 |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Present value of expected future policy benefits ("PVEFPB"), beginning of period | 6,023.3 | 5,886.8 |  |
Effect of changes in discount rate assumptions, beginning of period | 229.8 | 483.3 |  |
Beginning PVEFPB at original discount rate | 6,253.1 | 6,370.1 |  |
Effect of changes in cash flow assumptions |  |  | (39.2) | 0.0
Effect of actual variances from expected experience |  |  | 16.4 | (46.9)
Adjusted beginning of period PVEFPB |  |  | 6,230.3 | 6,323.2
Issuances | 202.5 | 205.3 |  |
Interest accrual | 218.4 | 222.6 |  |
Benefit payments | (329.1) | (314.2) |  |
Ending PVEFPB at original discount rate | 6,322.1 | 6,436.9 |  |
Effect of changes in discount rate assumptions, end of period | (172.8) | (801.6) |  |
PVEFPB, end of period | 6,149.3 | 5,635.3 |  |
Net liability for future policy benefits | 3,383.8 | 2,966.8 |  |
Flooring impact | 0.0 | 0.0 |  |
Adjusted net liability for future policy benefits | 3,383.8 | 2,966.8 |  |
Related reinsurance recoverable | (1.5) | (1.3) |  |
Net liability for future policy benefits, net of reinsurance recoverable | 3,382.3 | 2,965.5 |  |
Medicare supplement |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Present value of expected net premiums ("PVENP"), beginning of period | 3,009.1 | 2,800.6 |  |
Effect of changes in discount rate assumptions, beginning of period | 99.2 | 196.4 |  |
Beginning PVENP at original discount rate | 3,108.3 | 2,997.0 |  |
Effect of changes in cash flow assumptions |  |  | 85.2 | 0.0
Effect of actual variances from expected experience |  |  | 10.6 | (4.2)
Adjusted beginning of period PVENP |  |  | 3,204.1 | 2,992.8
Issuances | 243.5 | 238.9 |  |
Interest accrual | 98.5 | 91.3 |  |
Net premiums collected | (337.3) | (324.5) |  |
Ending PVENP at original discount rate | 3,208.8 | 2,998.5 |  |
Effect of changes in discount rate assumptions, end of period | (64.8) | (274.1) |  |
PVENP, end of period | 3,144.0 | 2,724.4 |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Present value of expected future policy benefits ("PVEFPB"), beginning of period | 3,236.6 | 3,033.1 |  |
Effect of changes in discount rate assumptions, beginning of period | 108.3 | 212.0 |  |
Beginning PVEFPB at original discount rate | 3,344.9 | 3,245.1 |  |
Effect of changes in cash flow assumptions |  |  | 95.2 | 0.0
Effect of actual variances from expected experience |  |  | 11.3 | 7.4
Adjusted beginning of period PVEFPB |  |  | 3,451.4 | 3,252.5
Issuances | 239.9 | 238.9 |  |
Interest accrual | 106.3 | 99.3 |  |
Benefit payments | (360.2) | (362.1) |  |
Ending PVEFPB at original discount rate | 3,437.4 | 3,228.6 |  |
Effect of changes in discount rate assumptions, end of period | (71.5) | (295.5) |  |
PVEFPB, end of period | 3,365.9 | 2,933.1 |  |
Net liability for future policy benefits | 221.9 | 208.7 |  |
Flooring impact | 0.5 | 0.2 |  |
Adjusted net liability for future policy benefits | 222.4 | 208.9 |  |
Related reinsurance recoverable | 0.0 | 0.0 |  |
Net liability for future policy benefits, net of reinsurance recoverable | 222.4 | 208.9 |  |
Long-term care |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Present value of expected net premiums ("PVENP"), beginning of period | 1,055.6 | 1,034.1 |  |
Effect of changes in discount rate assumptions, beginning of period | (7.6) | 23.2 |  |
Beginning PVENP at original discount rate | 1,048.0 | 1,057.3 |  |
Effect of changes in cash flow assumptions |  |  | 9.6 | 0.0
Effect of actual variances from expected experience |  |  | (8.9) | 20.7
Adjusted beginning of period PVENP |  |  | 1,048.7 | 1,078.0
Issuances | 145.0 | 56.3 |  |
Interest accrual | 39.6 | 37.1 |  |
Net premiums collected | (119.9) | (120.6) |  |
Ending PVENP at original discount rate | 1,113.4 | 1,050.8 |  |
Effect of changes in discount rate assumptions, end of period | 17.1 | (53.4) |  |
PVENP, end of period | 1,130.5 | 997.4 |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Present value of expected future policy benefits ("PVEFPB"), beginning of period | 4,364.6 | 4,158.1 |  |
Effect of changes in discount rate assumptions, beginning of period | (132.8) | 28.5 |  |
Beginning PVEFPB at original discount rate | 4,231.8 | 4,186.6 |  |
Effect of changes in cash flow assumptions |  |  | 8.2 | 0.0
Effect of actual variances from expected experience |  |  | (23.2) | 30.3
Adjusted beginning of period PVEFPB |  |  | 4,216.8 | 4,216.9
Issuances | 145.2 | 56.5 |  |
Interest accrual | 171.0 | 167.3 |  |
Benefit payments | (222.0) | (214.0) |  |
Ending PVEFPB at original discount rate | 4,311.0 | 4,226.7 |  |
Effect of changes in discount rate assumptions, end of period | 159.0 | (252.1) |  |
PVEFPB, end of period | 4,470.0 | 3,974.6 |  |
Net liability for future policy benefits | 3,339.5 | 2,977.2 |  |
Flooring impact | 0.0 | 0.0 |  |
Adjusted net liability for future policy benefits | 3,339.5 | 2,977.2 |  |
Related reinsurance recoverable | (384.6) | (330.4) |  |
Net liability for future policy benefits, net of reinsurance recoverable | 2,954.9 | 2,646.8 |  |
Traditional life |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Present value of expected net premiums ("PVENP"), beginning of period | 2,279.6 | 2,175.0 |  |
Effect of changes in discount rate assumptions, beginning of period | 67.6 | 137.1 |  |
Beginning PVENP at original discount rate | 2,347.2 | 2,312.1 |  |
Effect of changes in cash flow assumptions |  |  | (20.1) | 0.0
Effect of actual variances from expected experience |  |  | (55.3) | (47.0)
Adjusted beginning of period PVENP |  |  | 2,271.8 | 2,265.1
Issuances | 292.6 | 300.7 |  |
Interest accrual | 73.4 | 70.0 |  |
Net premiums collected | (303.3) | (301.5) |  |
Ending PVENP at original discount rate | 2,334.5 | 2,334.3 |  |
Effect of changes in discount rate assumptions, end of period | (35.6) | (188.6) |  |
PVENP, end of period | 2,298.9 | 2,145.7 |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Present value of expected future policy benefits ("PVEFPB"), beginning of period | 4,694.7 | 4,417.9 |  |
Effect of changes in discount rate assumptions, beginning of period | 170.9 | 336.6 |  |
Beginning PVEFPB at original discount rate | 4,865.6 | 4,754.5 |  |
Effect of changes in cash flow assumptions |  |  | (20.7) | 0.0
Effect of actual variances from expected experience |  |  | (65.7) | (59.1)
Adjusted beginning of period PVEFPB |  |  | 4,779.2 | 4,695.4
Issuances | 298.0 | 307.8 |  |
Interest accrual | 159.4 | 154.3 |  |
Benefit payments | (336.7) | (325.8) |  |
Ending PVEFPB at original discount rate | 4,899.9 | 4,831.7 |  |
Effect of changes in discount rate assumptions, end of period | (113.7) | (510.9) |  |
PVEFPB, end of period | 4,786.2 | 4,320.8 |  |
Net liability for future policy benefits | 2,487.3 | 2,175.1 |  |
Flooring impact | 0.0 | 0.0 |  |
Adjusted net liability for future policy benefits | 2,487.3 | 2,175.1 |  |
Related reinsurance recoverable | (178.7) | (182.2) |  |
Net liability for future policy benefits, net of reinsurance recoverable | 2,308.6 | 1,992.9 |  |
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 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 | 4.4 | 4.7 |  |
Interest accrual | 0.0 | 0.0 |  |
Net premiums collected | (4.4) | (4.7) |  |
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 | 308.9 | 310.9 |  |
Effect of changes in discount rate assumptions, beginning of period | 3.0 | 15.4 |  |
Beginning PVEFPB at original discount rate | 311.9 | 326.3 |  |
Effect of changes in cash flow assumptions |  |  | 0.0 | 0.0
Effect of actual variances from expected experience |  |  | (16.5) | 1.8
Adjusted beginning of period PVEFPB |  |  | $ 295.4 | $ 328.1
Issuances | 4.5 | 4.7 |  |
Interest accrual | 10.3 | 11.1 |  |
Benefit payments | (23.9) | (25.8) |  |
Ending PVEFPB at original discount rate | 286.3 | 318.1 |  |
Effect of changes in discount rate assumptions, end of period | (1.3) | (30.9) |  |
PVEFPB, end of period | 285.0 | 287.2 |  |
Net liability for future policy benefits | 285.0 | 287.2 |  |
Flooring impact | 0.0 | 0.0 |  |
Adjusted net liability for future policy benefits | 285.0 | 287.2 |  |
Related reinsurance recoverable | 0.0 | 0.0 |  |
Net liability for future policy benefits, net of reinsurance recoverable | $ 285.0 | $ 287.2 |  |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 + Details
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- Definition Amount of cumulative increase (decrease) in expected future policy benefit and expense component for liability of future policy benefit from cash flow assumption change for future cash flows. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I + Details
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- Definition Amount of cumulative increase (decrease) in expected future policy benefit and expense component for liability of future policy benefit from effect of variance from cash flow assumption change for actual experience. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I + Details
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- Definition Amount of interest expense for expected future policy benefit and expense component of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I + Details
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- Definition Amount of increase in expected future policy benefit and expense component of liability for future policy benefit from contract issuance. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I + Details
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