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Goodwill and Acquired Intangible Assets - Changes to Goodwill (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Goodwill [Roll Forward]        
Beginning balance [1]     $ 1,575,100,000  
Adjustments from 2021 acquisitions     (1,800,000)  
Goodwill from 2022 acquisitions     123,000,000.0  
Ending balance $ 1,696,300,000   1,696,300,000  
Impairment of goodwill $ 0 $ 0 $ 0 $ 0
[1] The Condensed Consolidated Balance Sheet as of December 31, 2021 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.