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INVESTMENTS - SUMMARY OF CHANGES IN THE ALLOWANCE FOR CURRENT EXPECTED CREDIT LOSSES (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period $ 39.0 $ 59.1 $ 42.9 $ 56.0
Additions for securities for which credit losses were not previously recorded 2.2 1.9 4.4 4.9
Additions (reductions) for securities where an allowance was previously recorded (0.2) 6.7 (6.2) 7.5
Reduction for securities sold during the period (1.2) (1.6) (1.3) (2.3)
Allowance at the end of the period 39.8 66.1 39.8 66.1
Corporate securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 37.7 57.2 41.7 54.4
Additions for securities for which credit losses were not previously recorded 2.2 1.7 4.4 4.7
Additions (reductions) for securities where an allowance was previously recorded (0.2) 7.1 (6.3) 7.6
Reduction for securities sold during the period (1.1) (1.6) (1.2) (2.3)
Allowance at the end of the period 38.6 64.4 38.6 64.4
States and political subdivisions        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 0.6 0.8 0.7 0.9
Additions for securities for which credit losses were not previously recorded 0.0 0.2 (0.1) 0.2
Additions (reductions) for securities where an allowance was previously recorded 0.0 0.0 0.0 (0.1)
Reduction for securities sold during the period 0.0 0.0 0.0 0.0
Allowance at the end of the period 0.6 1.0 0.6 1.0
Foreign governments        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 0.6 0.5 0.4 0.4
Additions for securities for which credit losses were not previously recorded 0.0 0.0 0.1 0.0
Additions (reductions) for securities where an allowance was previously recorded 0.0 0.0 0.1 0.1
Reduction for securities sold during the period (0.1) 0.0 (0.1) 0.0
Allowance at the end of the period 0.5 0.5 0.5 0.5
Asset-backed securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 0.1 0.6 0.1 0.3
Additions for securities for which credit losses were not previously recorded 0.0 0.0 0.0 0.0
Additions (reductions) for securities where an allowance was previously recorded 0.0 (0.4) 0.0 (0.1)
Reduction for securities sold 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