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INVESTMENTS - SCHEDULE OF INVESTMENT INCOME (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]      
Fixed maturities $ 1,222.1 $ 1,142.9 $ 1,084.1
Equity securities 35.0 1.7 5.9
Mortgage loans 126.5 97.4 63.0
Policy loans 9.0 8.6 8.4
Other invested assets 26.8 8.2 38.0
Cash and cash equivalents 39.0 20.9 5.9
Trading securities 5.0 6.5 7.7
Option income (loss) 243.6 (48.3) (6.3)
Change in value of options 12.2 177.3 (200.3)
Other special-purpose portfolios 68.7 114.0 35.8
Gross investment income 1,787.9 1,529.2 1,042.2
Less investment expenses 39.1 29.5 26.3
Net investment income $ 1,748.8 $ 1,499.7 $ 1,015.9