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INVESTMENTS - SUMMARY OF CHANGES IN THE ALLOWANCE FOR CURRENT EXPECTED CREDIT LOSSES (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period $ 39.8 $ 66.1 $ 42.9 $ 56.0
Additions for securities for which credit losses were not previously recorded 1.1 1.3 5.5 6.2
Additions (reductions) for securities where an allowance was previously recorded (6.4) 2.3 (12.6) 9.9
Reduction for securities disposed during the period (8.6) (0.3) (9.9) (2.7)
Allowance at the end of the period 25.9 69.4 25.9 69.4
Corporate securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 38.6 64.4 41.7 54.4
Additions for securities for which credit losses were not previously recorded 1.1 1.2 5.4 5.9
Additions (reductions) for securities where an allowance was previously recorded (6.6) 1.5 (12.8) 9.2
Reduction for securities disposed during the period (8.6) (0.3) (9.8) (2.7)
Allowance at the end of the period 24.5 66.8 24.5 66.8
States and political subdivisions        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 0.6 1.0 0.7 0.9
Additions for securities for which credit losses were not previously recorded 0.0 0.0 0.0 0.2
Additions (reductions) for securities where an allowance was previously recorded 0.2 0.7 0.1 0.6
Reduction for securities disposed during the period 0.0 0.0 0.0 0.0
Allowance at the end of the period 0.8 1.7 0.8 1.7
Foreign governments        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 0.5 0.5 0.4 0.4
Additions for securities for which credit losses were not previously recorded 0.0 0.0 0.1 0.1
Additions (reductions) for securities where an allowance was previously recorded 0.0 0.2 0.1 0.2
Reduction for securities disposed during the period 0.0 0.0 (0.1) 0.0
Allowance at the end of the period 0.5 0.7 0.5 0.7
Asset-backed securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 0.1 0.2 0.1 0.3
Additions for securities for which credit losses were not previously recorded 0.0 0.1 0.0 0.0
Additions (reductions) for securities where an allowance was previously recorded 0.0 (0.1) 0.0 (0.1)
Reduction for securities disposed during the period 0.0 0.0 0.0 0.0
Allowance at the end of the period $ 0.1 $ 0.2 $ 0.1 $ 0.2