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BUSINESS SEGMENTS - SCHEDULE OF SEGMENT REPORTING INFORMATION BY SEGMENT (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenues: |  |  |
Insurance policy income | $ 2,558.5 | $ 2,505.5 | $ 2,499.8
Net investment income | 1,748.8 | 1,499.7 | 1,015.9
Total segment revenues | 4,467.7 | 4,144.6 | 3,667.0
Benefits and expenses: |  |  |
Insurance policy benefits | 2,471.9 | 2,331.1 | 1,616.7
Interest expense | 254.4 | 238.6 | 137.0
Impact of annual option forfeitures related to fixed indexed annuity surrenders | (26.0) | (7.1) | 1.0
Other expenses | 1,055.3 | 1,048.3 | 950.9
Total segment expenses | 3,916.9 | 3,685.1 | 3,200.3
Operating earnings before taxes | 550.8 | 459.5 | 466.7
Income tax expense on operating income | 121.5 | 103.4 | 106.3
Net operating income | 429.3 | 356.1 | 360.4
Insurance product lines |  |  |
Benefits and expenses: |  |  |
Allocated expenses | 615.3 | 599.0 | 596.6
Total insurance product margin | 1,040.0 | 959.0 | 936.5
Operating earnings before taxes | 424.7 | 360.0 | 339.9
Investments not allocated to product lines |  |  |
Revenues: |  |  |
Change in market values of the underlying options supporting the fixed indexed annuity and life products (offset by market value changes credited to policyholder balances) | 253.7 | 131.5 | (205.3)
Investment income not allocated to product lines | 449.9 | 335.6 | 257.5
Benefits and expenses: |  |  |
Interest credited | 61.6 | 28.8 | 28.5
Market value changes of options credited to fixed indexed annuity and life policyholders | 253.7 | 131.5 | (205.3)
Interest expense | 219.7 | 169.8 | 96.0
Amortization | 2.4 | 1.6 | 1.5
Other expenses | 24.3 | 22.3 | (13.4)
Total insurance product margin | 167.9 | 120.2 | 143.9
Assets of our other non-life companies |  |  |
Revenues: |  |  |
Fee revenue | 190.5 | 177.6 | 169.3
Benefits and expenses: |  |  |
Commissions and other operating expenses | 160.5 | 146.6 | 145.6
Total insurance product margin | 30.0 | 31.0 | 23.7
Expenses not allocated to product lines |  |  |
Revenues: |  |  |
Amounts netted in expenses not allocated to product lines | 3.4 | 36.6 | 30.5
Benefits and expenses: |  |  |
Expenses not allocated to product lines | 75.2 | 88.3 | 71.3
Total insurance product margin | (71.8) | (51.7) | (40.8)
Annuity | Insurance product lines |  |  |
Revenues: |  |  |
Insurance policy income | 35.5 | 28.4 | 23.1
Net investment income | 565.0 | 516.3 | 480.0
Total insurance product line revenue | 600.5 | 544.7 | 503.1
Benefits and expenses: |  |  |
Insurance policy benefits | (15.2) | 29.0 | 38.3
Interest credited | 253.8 | 209.4 | 175.5
Amortization and non-deferred commissions | 87.7 | 71.3 | 62.4
Total expenses | 326.3 | 309.7 | 276.2
Total insurance product margin | 274.2 | 235.0 | 226.9
Health | Insurance product lines |  |  |
Revenues: |  |  |
Insurance policy income | 1,618.3 | 1,594.6 | 1,617.3
Net investment income | 299.6 | 296.7 | 293.3
Total insurance product line revenue | 1,917.9 | 1,891.3 | 1,910.6
Benefits and expenses: |  |  |
Insurance policy benefits | 1,239.6 | 1,234.9 | 1,237.5
Amortization and non-deferred commissions | 161.5 | 162.1 | 168.7
Total expenses | 1,401.1 | 1,397.0 | 1,406.2
Total insurance product margin | 516.8 | 494.3 | 504.4
Life | Insurance product lines |  |  |
Revenues: |  |  |
Insurance policy income | 904.7 | 882.5 | 859.4
Net investment income | 147.1 | 144.8 | 141.9
Total insurance product line revenue | 1,051.8 | 1,027.3 | 1,001.3
Benefits and expenses: |  |  |
Insurance policy benefits | 576.0 | 570.0 | 575.3
Interest credited | 51.5 | 49.3 | 49.0
Amortization and non-deferred commissions | 98.0 | 85.8 | 77.5
Advertising expense | 77.3 | 92.5 | 94.3
Total expenses | 802.8 | 797.6 | 796.1
Total insurance product margin | 249.0 | 229.7 | 205.2
Allocated expenses | Insurance product lines |  |  |
Benefits and expenses: |  |  |
Total insurance product margin | $ (615.3) | $ (599.0) | $ (596.6)

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