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BUSINESS SEGMENTS - SCHEDULE OF SEGMENT REPORTING INFORMATION BY SEGMENT (Details) - USD ($)
$ in Millions
 12 Months Ended
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)