Software and Other Intangible Assets - Summary of Carrying Amount and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 528,129	$ 535,097
Accumulated Amortization	(183,973)	(178,128)
Total	344,156	356,969
Software for resale
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	136,739	138,823
Accumulated Amortization	(122,317)	(122,061)
Total	14,422	16,762
Software for internal use
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	405,794	400,065
Accumulated Amortization	(195,045)	(182,310)
Total	210,749	217,755
Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	542,533	538,888
Accumulated Amortization	(317,362)	(304,371)
Total	225,171	234,517
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	501,039	507,785
Accumulated Amortization	(166,172)	(160,775)
Total	334,867	347,010
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,090	27,312
Accumulated Amortization	(17,801)	(17,353)
Total	$ 9,289	$ 9,959