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Goodwill and Intangible Assets - Changes to the Carrying Amount of Goodwill by Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2022
Jun. 30, 2023
Goodwill [Line Items]    
Goodwill impairment $ 0  
Goodwill [Roll Forward]    
Beginning balance   $ 2,930,211,000
Foreign currency translation impact   1,610,000
Ending balance   2,931,821,000
Goodwill, accumulated impairment losses   0
Research    
Goodwill [Roll Forward]    
Beginning balance   2,651,193,000
Foreign currency translation impact   1,033,000
Ending balance   2,652,226,000
Conferences    
Goodwill [Roll Forward]    
Beginning balance   183,951,000
Foreign currency translation impact   22,000
Ending balance   183,973,000
Consulting    
Goodwill [Roll Forward]    
Beginning balance   95,067,000
Foreign currency translation impact   555,000
Ending balance   $ 95,622,000