Business segment information (disaggregated revenue information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregated revenue information
Revenue	$ 538.1	$ 536.5
Operating segments [Member]
Disaggregated revenue information
Revenue	538.1	536.5
Merchant Services [Member] \| Operating segments [Member]
Disaggregated revenue information
Revenue	104.9	97.8
B2B Payments [Member] \| Operating segments [Member]
Disaggregated revenue information
Revenue	73.5	70.2
Data Solutions [Member] \| Operating segments [Member]
Disaggregated revenue information
Revenue	97.5	77.2
Print [Member] \| Operating segments [Member]
Disaggregated revenue information
Revenue	262.2	291.3
Checks [Member]
Disaggregated revenue information
Revenue	165.9	175.2
Checks [Member] \| Print [Member] \| Operating segments [Member]
Disaggregated revenue information
Revenue	165.9	175.2
Merchant services solutions [Member]
Disaggregated revenue information
Revenue	104.9	97.8
Merchant services solutions [Member] \| Merchant Services [Member] \| Operating segments [Member]
Disaggregated revenue information
Revenue	104.9	97.8
Data-driven marketing [Member]
Disaggregated revenue information
Revenue	92.5	72.0
Data-driven marketing [Member] \| Data Solutions [Member] \| Operating segments [Member]
Disaggregated revenue information
Revenue	92.5	72.0
Treasury management solutions [Member]
Disaggregated revenue information
Revenue	57.8	54.3
Treasury management solutions [Member] \| B2B Payments [Member] \| Operating segments [Member]
Disaggregated revenue information
Revenue	57.8	54.3
Forms and other business products [Member]
Disaggregated revenue information
Revenue	52.4	60.5
Forms and other business products [Member] \| Print [Member] \| Operating segments [Member]
Disaggregated revenue information
Revenue	52.4	60.5
Promotional solutions [Member]
Disaggregated revenue information
Revenue	43.9	55.6
Promotional solutions [Member] \| Print [Member] \| Operating segments [Member]
Disaggregated revenue information
Revenue	43.9	55.6
Other payment solutions [Member]
Disaggregated revenue information
Revenue	15.7	15.9
Other payment solutions [Member] \| B2B Payments [Member] \| Operating segments [Member]
Disaggregated revenue information
Revenue	15.7	15.9
Other web based solutions [Member]
Disaggregated revenue information
Revenue	5.0	5.2
Other web based solutions [Member] \| Data Solutions [Member] \| Operating segments [Member]
Disaggregated revenue information
Revenue	$ 5.0	$ 5.2