Other Intangible Assets, net and Goodwill - Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Goodwill And Intangible Assets [Line Items]
Finite-lived intangible assets, Gross	$ 8,113,820	$ 8,153,014
Finite-lived intangible assets, Accumulated Amortization	(1,312,678)	(943,909)
Finite-lived intangible assets, Net	6,801,142	7,209,105
Total intangible assets, Gross	8,276,759	8,314,259
Total intangible assets, Net	6,964,081	7,370,350
Trade names
Goodwill And Intangible Assets [Line Items]
Indefinite-lived intangible assets	162,939	161,245
Customer relationships
Goodwill And Intangible Assets [Line Items]
Finite-lived intangible assets, Gross	5,501,710	5,598,175
Finite-lived intangible assets, Accumulated Amortization	(443,814)	(261,350)
Finite-lived intangible assets, Net	5,057,896	5,336,825
Database and content
Goodwill And Intangible Assets [Line Items]
Finite-lived intangible assets, Gross	1,853,364	1,848,041
Finite-lived intangible assets, Accumulated Amortization	(555,447)	(464,683)
Finite-lived intangible assets, Net	1,297,917	1,383,358
Computer software
Goodwill And Intangible Assets [Line Items]
Finite-lived intangible assets, Gross	714,904	658,976
Finite-lived intangible assets, Accumulated Amortization	(298,333)	(209,611)
Finite-lived intangible assets, Net	416,571	449,365
Trade names
Goodwill And Intangible Assets [Line Items]
Finite-lived intangible assets, Gross	14,742	18,606
Finite-lived intangible assets, Accumulated Amortization	(5,190)	(2,360)
Finite-lived intangible assets, Net	9,552	16,246
Backlog
Goodwill And Intangible Assets [Line Items]
Finite-lived intangible assets, Gross	29,100	29,216
Finite-lived intangible assets, Accumulated Amortization	(9,894)	(5,905)
Finite-lived intangible assets, Net	$ 19,206	$ 23,311