Goodwill and Acquired Client Relationships - Schedule of Changes in Goodwill (Details)	9 Months Ended
	Sep. 30, 2024 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 2,523,600,000
Foreign currency translation	8,400,000
Ending balance	2,532,000,000
Goodwill impairment	$ 0