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INVESTMENTS - SUMMARY OF CHANGES IN THE ALLOWANCE FOR CURRENT EXPECTED CREDIT LOSSES (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]      
Allowance at the beginning of the period $ 42.9 $ 56.0 $ 7.6
Additions for securities for which credit losses were not previously recorded 10.8 7.7 50.4
Additions (reductions) for securities where an allowance was previously recorded (6.2) (7.9) 10.3
Reduction for securities disposed during the period (10.4) (12.9) (12.3)
Allowance at the end of the period 37.1 42.9 56.0
Corporate securities      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]      
Allowance at the beginning of the period 41.7 54.4 7.4
Additions for securities for which credit losses were not previously recorded 8.9 7.3 48.9
Additions (reductions) for securities where an allowance was previously recorded (9.2) (7.3) 10.3
Reduction for securities disposed during the period (10.3) (12.7) (12.2)
Allowance at the end of the period 31.1 41.7 54.4
States and political subdivisions      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]      
Allowance at the beginning of the period 0.7 0.9 0.0
Additions for securities for which credit losses were not previously recorded 0.0 0.3 0.7
Additions (reductions) for securities where an allowance was previously recorded 2.7 (0.4) 0.3
Reduction for securities disposed during the period (0.1) (0.1) (0.1)
Allowance at the end of the period 3.3 0.7 0.9
Foreign governments      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]      
Allowance at the beginning of the period 0.4 0.4 0.2
Additions for securities for which credit losses were not previously recorded 0.3 0.1 0.5
Additions (reductions) for securities where an allowance was previously recorded 0.3 0.0 (0.3)
Reduction for securities disposed during the period 0.0 (0.1) 0.0
Allowance at the end of the period 1.0 0.4 0.4
Asset-backed securities      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]      
Allowance at the beginning of the period 0.1 0.3 0.0
Additions for securities for which credit losses were not previously recorded 0.0 0.0 0.3
Additions (reductions) for securities where an allowance was previously recorded 0.0 (0.2) 0.0
Reduction for securities disposed during the period 0.0 0.0 0.0
Allowance at the end of the period 0.1 0.1 0.3
Commercial mortgage-backed securities      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]      
Allowance at the beginning of the period 0.0 0.0 0.0
Additions for securities for which credit losses were not previously recorded 1.6 0.0 0.0
Additions (reductions) for securities where an allowance was previously recorded 0.0 0.0 0.0
Reduction for securities disposed during the period 0.0 0.0 0.0
Allowance at the end of the period $ 1.6 $ 0.0 $ 0.0