Software and Other Intangible Assets - Summary of Carrying Amount and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 533,655	$ 535,097
Accumulated Amortization	(205,398)	(178,128)
Total	328,257	356,969
Software for resale
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	138,017	138,823
Accumulated Amortization	(127,535)	(122,061)
Total	10,482	16,762
Software for internal use
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	424,054	400,065
Accumulated Amortization	(230,297)	(182,310)
Total	193,757	217,755
Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	562,071	538,888
Accumulated Amortization	(357,832)	(304,371)
Total	204,239	234,517
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	506,270	507,785
Accumulated Amortization	(185,981)	(160,775)
Total	320,289	347,010
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,385	27,312
Accumulated Amortization	(19,417)	(17,353)
Total	$ 7,968	$ 9,959