SEGMENT INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Total revenues	$ 1,074.3	$ 986.2	$ 1,989.8	$ 1,843.2
Operating expenses:
Direct operating costs, exclusive of depreciation	620.6	580.8	1,181.6	1,114.5
Salaries and benefits	173.5	158.0	337.6	312.7
Selling, general and administrative	87.8	79.4	170.8	151.3
Goodwill impairment
Depreciation and amortization	33.8	33.7	66.0	66.4
Total operating expenses	915.7	851.9	1,756.0	1,644.9
Operating income	158.6	134.3	233.8	198.3
Corporate Services, Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Total revenues	(2.2)	(1.9)	(4.3)	(3.8)
Operating expenses:
Direct operating costs, exclusive of depreciation	(2.2)	(1.9)	(4.3)	(3.8)
Salaries and benefits	19.0	15.8	35.6	33.9
Selling, general and administrative	3.6	3.2	6.8	6.3
Goodwill impairment
Depreciation and amortization	0.1	0.1	0.3	0.2
Total operating expenses	20.5	17.2	38.4	36.6
Operating income	(22.7)	(19.1)	(42.7)	(40.4)
EFT Processing Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	338.5	305.4	571.0	522.6
Operating expenses:
Direct operating costs, exclusive of depreciation	173.9	152.5	310.4	283.6
Salaries and benefits	39.7	34.4	75.2	66.2
Selling, general and administrative	14.3	13.5	27.2	22.7
Goodwill impairment
Depreciation and amortization	26.0	25.1	50.3	48.7
Total operating expenses	253.9	225.5	463.1	421.2
Operating income	84.6	79.9	107.9	101.4
EFT Processing Segment [Member] | Corporate Services, Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Total revenues
Epay Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	280.1	260.9	547.5	518.0
Operating expenses:
Direct operating costs, exclusive of depreciation	210.9	198.5	413.0	393.6
Salaries and benefits	26.6	25.1	50.7	49.2
Selling, general and administrative	9.8	9.3	22.6	18.9
Goodwill impairment
Depreciation and amortization	1.7	1.8	3.3	3.5
Total operating expenses	249.0	234.7	489.6	465.2
Operating income	31.1	26.2	57.9	52.8
Epay Segment [Member] | Corporate Services, Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Total revenues
Money Transfer Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	457.9	421.8	875.6	806.4
Operating expenses:
Direct operating costs, exclusive of depreciation	238.0	231.7	462.5	441.1
Salaries and benefits	88.2	82.7	176.1	163.4
Selling, general and administrative	60.1	53.4	114.2	103.4
Goodwill impairment
Depreciation and amortization	6.0	6.7	12.1	14.0
Total operating expenses	392.3	374.5	764.9	721.9
Operating income	65.6	47.3	110.7	84.5
Money Transfer Segment [Member] | Corporate Services, Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Total revenues