v3.26.1
INVESTMENTS IN VARIABLE INTEREST ENTITIES - CHANGES IN ALLOWANCE (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period $ 43.9 $ 38.9 $ 36.0 $ 37.1
Additions for securities for which credit losses were not previously recorded 4.2 0.6 13.3 3.1
Additions (reductions) for securities where an allowance was previously recorded (2.7) 0.3 (1.2) 0.9
Reduction for securities disposed during the period (3.9) (0.7) (6.6) (2.0)
Allowance at the end of the period 41.5 39.1 41.5 39.1
Corporate securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 37.8 33.1 30.2 31.1
Additions for securities for which credit losses were not previously recorded 4.2 0.6 13.1 3.1
Additions (reductions) for securities where an allowance was previously recorded (2.8) 0.1 (1.4) 0.9
Reduction for securities disposed during the period (3.9) (0.7) (6.6) (2.0)
Allowance at the end of the period 35.3 33.1 35.3 33.1
Variable Interest Entity, Primary Beneficiary | Corporate securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period 1.0 2.5 0.6 1.3
Additions for securities for which credit losses were not previously recorded 0.8 0.2 0.9 1.2
Additions (reductions) for securities where an allowance was previously recorded (0.2) 0.6 0.2 1.3
Reduction for securities disposed during the period 0.0 (1.0) (0.1) (1.5)
Allowance at the end of the period $ 1.6 $ 2.3 $ 1.6 $ 2.3