Revenue - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Disaggregation of revenue
Revenue	$ 1,015,371	$ 3,010,121
U.S. dollar
Disaggregation of revenue
Revenue	918,042	2,723,796
British Pound Sterling
Disaggregation of revenue
Revenue	65,259	187,478
Euro
Disaggregation of revenue
Revenue	25,135	77,152
Other
Disaggregation of revenue
Revenue	6,935	21,695
Volume-based revenues
Disaggregation of revenue
Revenue	748,976	2,229,380
Non-volume related revenues
Disaggregation of revenue
Revenue	266,395	780,741
Issuer Solutions
Disaggregation of revenue
Revenue	470,978	1,386,939
Issuer Solutions | U.S. dollar
Disaggregation of revenue
Revenue	373,821	1,101,180
Issuer Solutions | British Pound Sterling
Disaggregation of revenue
Revenue	65,259	187,478
Issuer Solutions | Euro
Disaggregation of revenue
Revenue	25,135	77,152
Issuer Solutions | Other
Disaggregation of revenue
Revenue	6,763	21,129
Issuer Solutions | Volume-based revenues
Disaggregation of revenue
Revenue	227,423	670,374
Issuer Solutions | Non-volume related revenues
Disaggregation of revenue
Revenue	243,555	716,565
Merchant Solutions
Disaggregation of revenue
Revenue	348,591	1,016,727
Merchant Solutions | U.S. dollar
Disaggregation of revenue
Revenue	348,419	1,016,161
Merchant Solutions | Other
Disaggregation of revenue
Revenue	172	566
Merchant Solutions | Volume-based revenues
Disaggregation of revenue
Revenue	325,831	954,073
Merchant Solutions | Non-volume related revenues
Disaggregation of revenue
Revenue	22,760	62,654
Consumer Solutions
Disaggregation of revenue
Revenue	195,802	606,455
Consumer Solutions | U.S. dollar
Disaggregation of revenue
Revenue	195,802	606,455
Consumer Solutions | Volume-based revenues
Disaggregation of revenue
Revenue	195,722	604,933
Consumer Solutions | Non-volume related revenues
Disaggregation of revenue
Revenue	$ 80	$ 1,522