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BUSINESS SEGMENTS - SCHEDULE OF BALANCE SHEET INFORMATION, BY SEGMENT (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Segment Reporting Information [Line Items]    
Total assets $ 38,963.4 $ 38,790.6
Total liabilities 36,465.0 36,152.4
Investment income not allocated to product lines    
Segment Reporting Information [Line Items]    
Total assets 11,161.1 10,879.8
Total liabilities 7,687.1 7,425.3
Non-life companies included in the fee income segment    
Segment Reporting Information [Line Items]    
Total assets 143.1 161.0
Total liabilities 40.2 50.5
Other non-life companies    
Segment Reporting Information [Line Items]    
Total assets 392.6 358.9
Total liabilities 182.6 209.0
Annuity | Insurance Product Lines    
Segment Reporting Information [Line Items]    
Total assets 13,778.6 13,692.5
Total liabilities 14,656.2 14,445.0
Health | Insurance Product Lines    
Segment Reporting Information [Line Items]    
Total assets 9,197.8 9,367.1
Total liabilities 9,457.4 9,573.7
Life | Insurance Product Lines    
Segment Reporting Information [Line Items]    
Total assets 4,290.2 4,331.3
Total liabilities $ 4,441.5 $ 4,448.9