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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period $ 66.1 $ 54.2 $ 56.0 $ 7.6
Additions for securities for which credit losses were not previously recorded 1.3 7.6 6.2 41.2
Additions for purchased securities with deteriorated credit 0.0 0.0 0.0 0.0
Additions (reductions) for securities where an allowance was previously recorded 2.3 (6.4) 9.9 13.1
Reduction for securities sold during the period (0.3) (3.4) (2.7) (9.9)
Reduction for securities for which the Company made the decision to sell where an allowance was previously recorded 0.0 0.0 0.0 0.0
Write-offs 0.0 0.0 0.0 0.0
Recoveries of previously written-off amount 0.0 0.0 0.0 0.0
Allowance at the end of the period 69.4 52.0 69.4 52.0
Corporate securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 64.4 52.2 54.4 7.4
Additions for securities for which credit losses were not previously recorded 1.2 7.2 5.9 39.8
Additions for purchased securities with deteriorated credit 0.0 0.0 0.0 0.0
Additions (reductions) for securities where an allowance was previously recorded 1.5 (6.9) 9.2 11.8
Reduction for securities sold during the period (0.3) (3.3) (2.7) (9.8)
Reduction for securities for which the Company made the decision to sell where an allowance was previously recorded 0.0 0.0 0.0 0.0
Write-offs 0.0 0.0 0.0 0.0
Recoveries of previously written-off amount 0.0 0.0 0.0 0.0
Allowance at the end of the period 66.8 49.2 66.8 49.2
States and political subdivisions        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 1.0 1.1 0.9 0.0
Additions for securities for which credit losses were not previously recorded 0.0 0.2 0.2 0.7
Additions for purchased securities with deteriorated credit 0.0 0.0 0.0 0.0
Additions (reductions) for securities where an allowance was previously recorded 0.7 0.5 0.6 1.1
Reduction for securities sold during the period 0.0 (0.1) 0.0 (0.1)
Reduction for securities for which the Company made the decision to sell where an allowance was previously recorded 0.0 0.0 0.0 0.0
Write-offs 0.0 0.0 0.0 0.0
Recoveries of previously written-off amount 0.0 0.0 0.0 0.0
Allowance at the end of the period 1.7 1.7 1.7 1.7
Foreign governments        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 0.5 0.7 0.4 0.2
Additions for securities for which credit losses were not previously recorded 0.0 0.1 0.1 0.5
Additions for purchased securities with deteriorated credit 0.0 0.0 0.0 0.0
Additions (reductions) for securities where an allowance was previously recorded 0.2 0.0 0.2 0.1
Reduction for securities sold during the period 0.0 0.0 0.0 0.0
Reduction for securities for which the Company made the decision to sell where an allowance was previously recorded 0.0 0.0 0.0 0.0
Write-offs 0.0 0.0 0.0 0.0
Recoveries of previously written-off amount 0.0 0.0 0.0 0.0
Allowance at the end of the period 0.7 0.8 0.7 0.8
Asset-backed securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 0.2 0.2 0.3 0.0
Additions for securities for which credit losses were not previously recorded 0.1 0.1 0.0 0.2
Additions for purchased securities with deteriorated credit 0.0 0.0 0.0 0.0
Additions (reductions) for securities where an allowance was previously recorded (0.1) 0.0 (0.1) 0.1
Reduction for securities sold during the period 0.0 0.0 0.0 0.0
Reduction for securities for which the Company made the decision to sell where an allowance was previously recorded 0.0 0.0 0.0 0.0
Write-offs 0.0 0.0 0.0 0.0
Recoveries of previously written-off amount 0.0 0.0 0.0 0.0
Allowance at the end of the period $ 0.2 $ 0.3 $ 0.2 $ 0.3