Annual report pursuant to Section 13 and 15(d)

SETTLEMENT ASSETS AND OBLIGATIONS - Narrative (Details)

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SETTLEMENT ASSETS AND OBLIGATIONS - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Merchant reserves held by sponsor banks $ 103.8 $ 79.8  
Provision for merchant losses $ 4.1 $ 3.1 $ 3.1