BASIS OF PREPARATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Equipment and Software (Details)	Dec. 31, 2025
Computer and communications software and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	32 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	11 years
Furniture and other equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	6 years