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BUSINESS SEGMENTS - SCHEDULE OF SEGMENT REPORTING INFORMATION BY SEGMENT (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Revenues:            
Insurance policy income $ 658.4   $ 645.0 $ 1,960.4 $ 1,914.9  
Total segment revenues 1,187.1   1,123.7 3,353.2 3,334.7  
Expenses:            
Insurance policy benefits 702.1 $ 570.0 731.0 1,930.5 1,942.0 $ 2,450.3
Interest expense 56.6   68.0 177.7 192.4  
Other expenses 270.4   269.2 816.8 798.9  
Total segment expenses 1,024.3   970.2 2,973.5 2,957.8  
Operating earnings before taxes 162.8   153.5 379.7 376.9  
Income tax expense on operating income 35.6   34.3 83.9 85.6  
Net operating income 127.2   119.2 295.8 291.3  
Insurance Product Lines            
Expenses:            
Allocated expenses 151.0   153.0 461.6 469.2  
Total insurance product margin 300.5   282.2 801.8 786.9  
Operating earnings before taxes 149.5   129.2 340.2 317.7  
Investment income 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) 98.2   67.6 107.5 246.2  
Investment income not allocated to product lines 126.0   127.1 368.0 307.0  
Expenses:            
Interest credited 28.2   19.9 82.2 37.5  
Market value changes of options credited to fixed indexed annuity and life policyholders 98.2   67.6 107.5 246.2  
Interest expense 50.8   60.1 158.3 162.8  
Impact of annual option forfeitures related to fixed indexed annuity surrenders (3.8)   (7.4) (8.8) (19.6)  
Amortization 0.9   0.7 2.5 1.6  
Other expenses 10.4   8.3 22.5 22.1  
Total insurance product margin 39.5   45.5 111.3 102.6  
Fee revenue            
Revenues:            
Fee revenue 33.0   29.3 113.9 111.8  
Expenses:            
Commissions and other operating expenses 36.9   32.0 117.8 102.4  
Total insurance product margin (3.9)   (2.7) (3.9) 9.4  
Amounts netted in expenses not allocated to product lines            
Revenues:            
Amounts netted in expenses not allocated to product lines 0.6   0.7 2.8 3.2  
Expenses:            
Expenses not allocated to product lines 22.9   19.2 70.7 56.0  
Total insurance product margin (22.3)   (18.5) (67.9) (52.8)  
Annuity: | Insurance Product Lines            
Revenues:            
Insurance policy income 10.7   11.2 28.9 27.8  
Net investment income 157.7   142.2 461.0 417.2  
Total insurance product line revenue 168.4   153.4 489.9 445.0  
Expenses:            
Insurance policy benefits (6.2)   (25.9) 14.1 (23.0)  
Interest credited 75.4   65.2 217.1 184.7  
Amortization and non-deferred commissions 26.3   23.0 76.5 64.1  
Total expenses 95.5   62.3 307.7 225.8  
Total insurance product margin 72.9   91.1 182.2 219.2  
Health: | Insurance Product Lines            
Revenues:            
Insurance policy income 416.0   406.9 1,240.5 1,208.9  
Net investment income 75.4   75.0 226.4 224.4  
Total insurance product line revenue 491.4   481.9 1,466.9 1,433.3  
Expenses:            
Insurance policy benefits 293.3   314.1 926.9 924.9  
Amortization and non-deferred commissions 41.1   40.0 122.8 121.7  
Total expenses 334.4   354.1 1,049.7 1,046.6  
Total insurance product margin 157.0   127.8 417.2 386.7  
Life: | Insurance Product Lines            
Revenues:            
Insurance policy income 231.7   226.9 691.0 678.2  
Net investment income 37.8   36.8 113.2 110.0  
Total insurance product line revenue 269.5   263.7 804.2 788.2  
Expenses:            
Insurance policy benefits 142.6   143.5 425.2 432.1  
Interest credited 13.2   13.3 40.0 38.2  
Amortization and non-deferred commissions 28.3   25.1 81.9 72.9  
Advertising expense 14.8   18.5 54.7 64.0  
Total expenses 198.9   200.4 601.8 607.2  
Total insurance product margin 70.6   63.3 202.4 181.0  
Allocated expenses | Insurance Product Lines            
Expenses:            
Total insurance product margin $ (151.0)   $ (153.0) $ (461.6) $ (469.2)