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BUSINESS SEGMENTS - SCHEDULE OF BALANCE SHEET INFORMATION, BY SEGMENT (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Segment Reporting Information [Line Items]    
Total assets $ 38,296.2 $ 37,849.3
Total liabilities 35,685.2 35,334.1
Investment income not allocated to product lines    
Segment Reporting Information [Line Items]    
Total assets 10,206.1 10,599.1
Total liabilities 7,030.8 7,541.1
Non-life companies included in the fee income segment    
Segment Reporting Information [Line Items]    
Total assets 129.8 257.7
Total liabilities 33.7 37.0
Other non-life companies    
Segment Reporting Information [Line Items]    
Total assets 393.9 679.7
Total liabilities 248.3 414.5
Annuity | Insurance Product Lines    
Segment Reporting Information [Line Items]    
Total assets 13,741.8 13,001.4
Total liabilities 14,284.6 13,539.6
Health | Insurance Product Lines    
Segment Reporting Information [Line Items]    
Total assets 9,449.3 9,116.7
Total liabilities 9,647.6 9,490.7
Life | Insurance Product Lines    
Segment Reporting Information [Line Items]    
Total assets 4,375.3 4,194.7
Total liabilities $ 4,440.2 $ 4,311.2