SETTLEMENT ASSETS AND OBLIGATIONS (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Settlement assets:
Settlement cash and cash equivalents	$ 456.1	$ 367.2	$ 342.7	$ 327.4
Settlement restricted cash	157.8	189.2	$ 121.3	$ 125.0
Accounts receivable	743.2	769.5
Prepaid expenses and other current assets	190.0	196.8
Total settlement assets	1,547.1	1,522.7
Settlement obligations:
Trade account payables	507.0	628.2
Accrued expenses and other current liabilities	1,040.1	894.5
Total settlement obligations	$ 1,547.1	$ 1,522.7