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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, 2026
Mar. 31, 2025
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Allowance at the beginning of the period $ 36.0 $ 37.1
Additions for securities for which credit losses were not previously recorded 9.1 2.5
Additions for securities where an allowance was previously recorded 1.5 0.6
Reduction for securities disposed during the period (2.7) (1.3)
Allowance at the end of the period 43.9 38.9
Corporate securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Allowance at the beginning of the period 30.2 31.1
Additions for securities for which credit losses were not previously recorded 8.9 2.5
Additions for securities where an allowance was previously recorded 1.4 0.8
Reduction for securities disposed during the period (2.7) (1.3)
Allowance at the end of the period 37.8 33.1
Other    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Allowance at the beginning of the period 5.8 6.0
Additions for securities for which credit losses were not previously recorded 0.2 0.0
Additions for securities where an allowance was previously recorded 0.1 (0.2)
Reduction for securities disposed during the period 0.0 0.0
Allowance at the end of the period $ 6.1 $ 5.8