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BUSINESS SEGMENTS - SCHEDULE OF BALANCE SHEET INFORMATION, BY SEGMENT (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]    
Total assets $ 37,852.6 $ 35,027.1
Total liabilities 35,354.2 32,811.5
Investments not allocated to product lines    
Segment Reporting Information [Line Items]    
Total assets 10,597.6 8,711.5
Total liabilities 7,541.1 5,561.6
Non-life companies included in the fee income segment    
Segment Reporting Information [Line Items]    
Total assets 257.7 243.9
Total liabilities 37.0 35.2
Other non-life companies    
Segment Reporting Information [Line Items]    
Total assets 679.7 398.8
Total liabilities 413.0 193.4
Annuity | Insurance product lines    
Segment Reporting Information [Line Items]    
Total assets 13,006.2 12,006.5
Total liabilities 13,561.2 12,859.8
Health | Insurance product lines    
Segment Reporting Information [Line Items]    
Total assets 9,116.7 9,512.5
Total liabilities 9,490.7 9,866.9
Life | Insurance product lines    
Segment Reporting Information [Line Items]    
Total assets 4,194.7 4,153.9
Total liabilities $ 4,311.2 $ 4,294.6