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Supplemental balance sheet and cash flow information (goodwill) (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Goodwill [Roll Forward]
Goodwill, beginning of year			$ 1,430,590		$ 1,430,590
Asset impairment charge (Note 6)		$ (6,700)	0	$ 0	(6,700)	$ 0
Currency translation adjustment					(29)
Goodwill, end of period		1,423,861			1,423,861
Operating segments [Member] | Merchant Services [Member]
Goodwill [Roll Forward]
Goodwill, beginning of year			727,688		727,688
Goodwill, end of period		727,688			727,688
Operating segments [Member] | B2B Payments [Member]
Goodwill [Roll Forward]
Goodwill, beginning of year			160,431		160,431
Goodwill, end of period		160,431			160,431
Operating segments [Member] | Data Solutions [Member]
Goodwill [Roll Forward]
Goodwill, beginning of year			40,804		40,804
Goodwill, end of period	[1]	40,804			40,804
Goodwill accumulated impairment charges		145,584			145,584		$ 145,584
Operating segments [Member] | Print [Member]
Goodwill [Roll Forward]
Goodwill, beginning of year			493,924		493,924
Currency translation adjustment					(29)
Goodwill, end of period	[1]	493,895			493,895
Goodwill accumulated impairment charges		193,699			193,699		$ 193,699
Operating segments [Member] | All Other [Member]
Goodwill [Roll Forward]
Goodwill, beginning of year			$ 7,743		7,743
Asset impairment charge (Note 6)					(6,700)
Goodwill, end of period	[1]	1,043			1,043
Goodwill accumulated impairment charges		$ 6,700			$ 6,700
[1] (1) The Data Solutions and Print balances are net of accumulated impairment charges of $145,584 and $193,699, respectively, for each period. All Other is net of accumulated impairment charges of $6,700 as of September 30, 2024

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