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INVESTMENTS IN VARIABLE INTEREST ENTITIES - CHANGES IN ALLOWANCE (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Beginning allowance $ 5.3 $ 19.9 $ 2.2 $ 2.1
Additions for securities for which credit losses were not previously recorded 0.2 4.5 2.0 23.7
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 (2.9) (13.1) (1.4) (14.2)
Reduction for securities sold during the period (0.3) (0.5) (0.5) (0.8)
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
Ending allowance 2.3 10.8 2.3 10.8
Corporate securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Beginning allowance 4.9 18.2 1.9 2.1
Additions for securities for which credit losses were not previously recorded 0.2 4.2 1.9 21.7
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 (2.5) (11.9) (1.0) (13.0)
Reduction for securities sold during the period (0.3) (0.5) (0.5) (0.8)
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
Ending allowance 2.3 10.0 2.3 10.0
Variable Interest Entity, Primary Beneficiary | Corporate securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Beginning allowance 5.4 37.7 15.1 9.9
Additions for securities for which credit losses were not previously recorded 0.1 5.8 0.6 24.9
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 (1.0) (14.7) (3.5) (4.8)
Reduction for securities sold during the period (1.3) (1.1) (9.0) (2.3)
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
Ending allowance $ 3.2 $ 27.7 $ 3.2 $ 27.7