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BUSINESS SEGMENTS - SCHEDULE OF SEGMENT REPORTING INFORMATION BY SEGMENT (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Revenues: |  |
Insurance policy income | $ 673.4 | $ 650.7
Total segment revenues | 1,043.3 | 1,003.4
Expenses: |  |
Insurance policy benefits | 576.6 | 570.0
Interest expense | 50.9 | 62.0
Other expenses | 275.3 | 275.3
Total segment expenses | 913.4 | 898.8
Operating earnings before taxes | 129.9 | 104.6
Income tax expense on operating income | 28.6 | 23.5
Net operating income | 101.3 | 81.1
Insurance Product Lines |  |
Expenses: |  |
Allocated expenses | 159.9 | 161.2
Total insurance product margin | 256.9 | 248.9
Operating earnings before taxes | 97.0 | 87.7
Investment income not allocated to product lines |  |
Revenues: |  |
Change in market values of the underlying options supporting fixed indexed products | (64.5) | (70.2)
Investment income not allocated to product lines | 117.1 | 113.8
Expenses: |  |
Interest credited | 35.6 | 27.1
Market value changes of options credited to fixed indexed annuity and life policyholders | (64.5) | (70.2)
Interest expense | 46.9 | 54.2
Impact of annual option forfeitures related to fixed indexed annuity surrenders | (4.2) | (3.5)
Amortization | 1.1 | 0.8
Other expenses | (4.0) | (2.8)
Total insurance product margin | 41.7 | 38.0
Fee revenue |  |
Revenues: |  |
Fee revenue | 42.8 | 47.4
Expenses: |  |
Commissions and other operating expenses | 32.2 | 48.2
Total insurance product margin | 10.6 | (0.8)
Amounts netted in expenses not allocated to product lines |  |
Revenues: |  |
Amounts netted in expenses not allocated to product lines | 1.0 | 1.0
Expenses: |  |
Expenses not allocated to product lines | 20.4 | 21.3
Total insurance product margin | (19.4) | (20.3)
Annuity: | Insurance Product Lines |  |
Revenues: |  |
Insurance policy income | 8.7 | 9.8
Net investment income | 161.0 | 148.0
Total insurance product line revenue | 169.7 | 157.8
Expenses: |  |
Insurance policy benefits | 11.6 | 10.3
Interest credited | 71.8 | 68.3
Amortization and non-deferred commissions | 27.8 | 24.7
Total expenses | 111.2 | 103.3
Total insurance product margin | 58.5 | 54.5
Health: | Insurance Product Lines |  |
Revenues: |  |
Insurance policy income | 432.0 | 412.0
Net investment income | 74.5 | 75.1
Total insurance product line revenue | 506.5 | 487.1
Expenses: |  |
Insurance policy benefits | 331.2 | 320.3
Amortization and non-deferred commissions | 42.7 | 40.6
Total expenses | 373.9 | 360.9
Total insurance product margin | 132.6 | 126.2
Life: | Insurance Product Lines |  |
Revenues: |  |
Insurance policy income | 232.7 | 228.9
Net investment income | 38.0 | 37.6
Total insurance product line revenue | 270.7 | 266.5
Expenses: |  |
Insurance policy benefits | 143.4 | 138.1
Interest credited | 13.7 | 13.0
Amortization and non-deferred commissions | 29.5 | 26.0
Advertising expense | 18.3 | 21.2
Total expenses | 204.9 | 198.3
Total insurance product margin | 65.8 | 68.2
Allocated expenses | Insurance Product Lines |  |
Expenses: |  |
Total insurance product margin | $ (159.9) | $ (161.2)

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