v3.26.1
BUSINESS SEGMENTS - SCHEDULE OF BALANCE SHEET INFORMATION, BY SEGMENT (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Segment Reporting [Line Items]    
Total assets $ 39,861.2 $ 38,790.6
Total liabilities 37,269.6 36,152.4
Investment income not allocated to product lines    
Segment Reporting [Line Items]    
Total assets 11,347.4 10,879.8
Total liabilities 8,226.9 7,425.3
Non-life companies included in the fee income segment    
Segment Reporting [Line Items]    
Total assets 130.9 161.0
Total liabilities 34.0 50.5
Other non-life companies    
Segment Reporting [Line Items]    
Total assets 358.0 358.9
Total liabilities 172.9 209.0
Annuity | Insurance Product Lines    
Segment Reporting [Line Items]    
Total assets 14,333.1 13,692.5
Total liabilities 14,879.7 14,445.0
Health | Insurance Product Lines    
Segment Reporting [Line Items]    
Total assets 9,310.9 9,367.1
Total liabilities 9,479.4 9,573.7
Life | Insurance Product Lines    
Segment Reporting [Line Items]    
Total assets 4,380.9 4,331.3
Total liabilities $ 4,476.7 $ 4,448.9