Acquisitions - Cayan - Pro Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Pro Forma Results of Operations
Total revenues	$ 1,007,580	$ 1,222,375	$ 1,994,750	$ 2,407,100
Net income attributable to TSYS common shareholders	142,435	115,014	284,276	220,882
Operating Income (Loss)	208,698	193,248	396,969	360,431
Cayan
Pro Forma Results of Operations
Total revenues		$ 45,400	$ 87,400	2,479,016	$ 1,261,499
Net income attributable to TSYS common shareholders				204,751	$ 108,453
Operating Income (Loss)	$ (800)			$ (4,300)