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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - Scenario, Forecast - USD ($) $ in Millions | 13 Months Ended | 37 Months Ended
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Dec. 31, 2019 | Mar. 31, 2022
Direct Connect Merchant Services LLC |  |
Schedule of Asset Acquisition [Line Items] |  |
Contingent cash payments for asset acquisitions | $ 7.3 |
Certain Merchant Portfolio Residual Rights |  |
Schedule of Asset Acquisition [Line Items] |  |
Contingent cash payments for asset acquisitions |  | $ 6.4

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