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INVESTMENTS - SUMMARY OF CHANGES IN THE ALLOWANCE FOR CURRENT EXPECTED CREDIT LOSSES (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Allowance at the beginning of the period $ 37.1 $ 42.9
Additions for securities for which credit losses were not previously recorded 2.5 2.2
Additions (reductions) for securities where an allowance was previously recorded 0.6 (6.0)
Reduction for securities disposed during the period (1.3) (0.1)
Allowance at the end of the period 38.9 39.0
Corporate securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Allowance at the beginning of the period 31.1 41.7
Additions for securities for which credit losses were not previously recorded 2.5 2.2
Additions (reductions) for securities where an allowance was previously recorded 0.8 (6.1)
Reduction for securities disposed during the period (1.3) (0.1)
Allowance at the end of the period 33.1 37.7
Other    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Allowance at the beginning of the period 6.0 1.2
Additions for securities for which credit losses were not previously recorded 0.0 0.0
Additions (reductions) for securities where an allowance was previously recorded (0.2) 0.1
Reduction for securities disposed during the period 0.0 0.0
Allowance at the end of the period $ 5.8 $ 1.3