RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Related Party Transaction [Line Items]
Revenue	$ 1,220,068	$ 1,497,208	$ 2,633,050	$ 3,531,503
Customer custodial funds	4,299,190		4,299,190		$ 5,347,428
Customer custodial fund liabilities	4,299,190		4,299,190		5,347,428
General and administrative	356,924	353,707	733,018	748,053
Related Party
Related Party Transaction [Line Items]
Revenue	900	1,600	2,700	5,200
Amounts receivable from customers, net of allowance	200		200		400
Customer custodial funds	6,800		6,800		11,000
Customer custodial fund liabilities	6,800		6,800		$ 11,000
Related Party \| Strategic Investments in Equity Securities, FV-NI and without Readily Determinable Fair Value
Related Party Transaction [Line Items]
Related party transaction	$ 1,900	$ 4,700	$ 1,900	$ 7,800

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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