Software and Other Intangible Assets - Summary of Carrying Amount and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 534,921	$ 536,504
Accumulated Amortization	(222,946)	(214,521)
Total	311,975	321,983
Software for resale
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	130,560	130,261
Accumulated Amortization	(125,683)	(123,418)
Total	4,877	6,843
Software for internal use
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	437,776	430,330
Accumulated Amortization	(251,713)	(240,717)
Total	186,063	189,613
Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	568,336	560,591
Accumulated Amortization	(377,396)	(364,135)
Total	190,940	196,456
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	510,927	512,389
Accumulated Amortization	(205,786)	(197,787)
Total	305,141	314,602
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	23,994	24,115
Accumulated Amortization	(17,160)	(16,734)
Total	$ 6,834	$ 7,381