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Supplemental balance sheet and cash flow information (intangibles) (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
		Jun. 01, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Amortizable intangibles [Line Items]
Gross carrying amount			$ 1,191,353		$ 1,191,353		$ 834,033
Accumulated amortization			(675,417)		(675,417)		(587,273)
Net carrying amount			515,936		515,936		246,760
Acquired intangibles					$ 357,349
Acquired intangibles, weighted-average amortization period (in years)					9 years
Amortization of intangibles			36,570	$ 22,515	$ 88,393	$ 67,555
Estimated future amortization expense
Remainder of 2021			41,235		41,235
2022			130,462		130,462
2023			101,863		101,863
2024			62,576		62,576
2025			46,791		46,791
First American Payment Systems, L.P. [Member]
Amortizable intangibles [Line Items]
Acquired intangibles		$ 279,111
Customer lists/relationships [Member]
Amortizable intangibles [Line Items]
Gross carrying amount			495,416		495,416		352,895
Accumulated amortization			(243,817)		(243,817)		(202,428)
Net carrying amount			251,599		251,599		150,467
Acquired intangibles	[1]				$ 142,514
Acquired intangibles, weighted-average amortization period (in years)	[1]				8 years
Customer lists/relationships [Member] | First American Payment Systems, L.P. [Member]
Amortizable intangibles [Line Items]
Acquired intangibles		$ 118,000
Acquired intangibles, weighted-average amortization period (in years)		8 years
Internal-use software [Member]
Amortizable intangibles [Line Items]
Gross carrying amount			439,785		$ 439,785		380,144
Accumulated amortization			(337,242)		(337,242)		(303,422)
Net carrying amount			102,543		102,543		76,722
Acquired intangibles					$ 59,429
Acquired intangibles, weighted-average amortization period (in years)					3 years
Internal-use software [Member] | First American Payment Systems, L.P. [Member]
Amortizable intangibles [Line Items]
Acquired intangibles		$ 6,111
Technology-based intangibles [Member]
Amortizable intangibles [Line Items]
Gross carrying amount			99,813		$ 99,813		33,813
Accumulated amortization			(35,013)		(35,013)		(27,613)
Net carrying amount			64,800		64,800		6,200
Acquired intangibles					$ 66,000
Acquired intangibles, weighted-average amortization period (in years)					8 years
Technology-based intangibles [Member] | First American Payment Systems, L.P. [Member]
Amortizable intangibles [Line Items]
Acquired intangibles		66,000
Partner relationships [Member]
Amortizable intangibles [Line Items]
Gross carrying amount			67,406		$ 67,406		0
Accumulated amortization			(1,525)		(1,525)		0
Net carrying amount			65,881		65,881		0
Acquired intangibles					$ 67,406
Acquired intangibles, weighted-average amortization period (in years)					15 years
Partner relationships [Member] | First American Payment Systems, L.P. [Member]
Amortizable intangibles [Line Items]
Acquired intangibles		67,000
Trade names [Member]
Amortizable intangibles [Line Items]
Gross carrying amount			52,033		$ 52,033		30,281
Accumulated amortization			(30,766)		(30,766)		(29,926)
Net carrying amount			21,267		21,267		355
Acquired intangibles					$ 22,000
Acquired intangibles, weighted-average amortization period (in years)					10 years
Trade names [Member] | First American Payment Systems, L.P. [Member]
Amortizable intangibles [Line Items]
Acquired intangibles		$ 22,000
Software to be sold [Member]
Amortizable intangibles [Line Items]
Gross carrying amount			36,900		$ 36,900		36,900
Accumulated amortization			(27,054)		(27,054)		(23,884)
Net carrying amount			$ 9,846		$ 9,846		$ 13,016
[1] Included $118,000 acquired via the First American acquisition (Note 6) with a weighted-average useful life of 8 years.

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