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Other Intangible Assets, net and Goodwill - Intangible Assets by Major Class (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Goodwill And Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross $ 8,171,830 $ 8,153,014
Finite-lived intangible assets, Accumulated Amortization (1,068,294) (943,909)
Finite-lived intangible assets, Net 7,103,536 7,209,105
Total intangible assets, Gross 8,334,791 8,314,259
Total intangible assets, Net 7,266,497 7,370,350
Trade names    
Goodwill And Intangible Assets [Line Items]    
Indefinite-lived intangible assets 162,961 161,245
Customer relationships    
Goodwill And Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross 5,600,118 5,598,175
Finite-lived intangible assets, Accumulated Amortization (322,719) (261,350)
Finite-lived intangible assets, Net 5,277,399 5,336,825
Database and content    
Goodwill And Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross 1,842,783 1,848,041
Finite-lived intangible assets, Accumulated Amortization (494,041) (464,683)
Finite-lived intangible assets, Net 1,348,742 1,383,358
Computer software    
Goodwill And Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross 682,948 658,976
Finite-lived intangible assets, Accumulated Amortization (238,093) (209,611)
Finite-lived intangible assets, Net 444,855 449,365
Trade names    
Goodwill And Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross 16,779 18,606
Finite-lived intangible assets, Accumulated Amortization (5,703) 2,360
Finite-lived intangible assets, Net 11,076 16,246
Backlog    
Goodwill And Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross 29,202 29,216
Finite-lived intangible assets, Accumulated Amortization (7,738) (5,905)
Finite-lived intangible assets, Net $ 21,464 $ 23,311