CLEARING OPERATIONS - Narrative (Details) - EuroCCP	1 Months Ended	3 Months Ended
Sep. 30, 2021 item	Mar. 31, 2022 Counterparty item
Clearing Operations
Number of European markets \| item	6	18
Number of central counterparties \| Counterparty		2
Default and liquid waterfalls regulatory capital		25.00%

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