Business segment information (disaggregated revenue information) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregated revenue information
Revenue		$ 537,816	$ 571,686	$ 1,072,770	$ 1,117,051
Merchant Services [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue		98,527	91,467	195,004	180,572
B2B Payments [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue		70,230	76,341	139,648	151,537
Data Solutions [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue		57,393	59,301	117,104	103,654
Print [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue		308,745	324,517	612,079	638,557
All Other [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue	[1]	2,921	20,060	8,935	42,731
Checks [Member]
Disaggregated revenue information
Revenue		179,360	186,424	357,844	365,071
Checks [Member] | Print [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue		179,360	186,424	357,844	365,071
Merchant services [Member]
Disaggregated revenue information
Revenue		98,527	91,467	195,004	180,572
Merchant services [Member] | Merchant Services [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue		98,527	91,467	195,004	180,572
Promotional solutions [Member]
Disaggregated revenue information
Revenue		71,021	72,037	132,079	142,689
Promotional solutions [Member] | Print [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue		71,021	71,330	132,079	141,233
Promotional solutions [Member] | All Other [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue			707		1,456
Forms and other business products [Member]
Disaggregated revenue information
Revenue		58,364	66,763	122,156	132,253
Forms and other business products [Member] | Print [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue		58,364	66,763	122,156	132,253
Treasury management solutions [Member]
Disaggregated revenue information
Revenue		55,349	61,166	110,426	121,640
Treasury management solutions [Member] | B2B Payments [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue		55,349	61,166	110,426	121,640
Data-driven marketing [Member]
Disaggregated revenue information
Revenue		52,495	54,503	106,819	93,785
Data-driven marketing [Member] | Data Solutions [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue		52,495	54,503	106,819	93,785
Other [Member]
Disaggregated revenue information
Revenue		22,700	39,326	48,442	81,041
Other [Member] | B2B Payments [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue		14,881	15,175	29,222	29,897
Other [Member] | Data Solutions [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue		4,898	4,798	10,285	9,869
Other [Member] | All Other [Member] | Operating segments [Member]
Disaggregated revenue information
Revenue		$ 2,921	$ 19,353	$ 8,935	$ 41,275

[1] Includes our North American web hosting and logo design businesses, which were sold in June 2023, and our payroll and human resources services business, which we are in the process of exiting (Note 6).