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Acquisitions - Narrative (Details) - USD ($)
3 Months Ended 4 Months Ended 6 Months Ended 18 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Business Acquisition [Line Items]              
Goodwill acquired during period       $ 48,768,000     $ 126,600,000
Goodwill deductible for tax purposes $ 2,000,000   $ 2,000,000 2,000,000 $ 2,000,000   $ 2,000,000
Transaction costs, excluding integration and transformation costs 400,000 $ 2,000,000   4,900,000   $ 6,100,000  
Customer relationships | Series of Individually Immaterial Asset Acquisitions              
Business Acquisition [Line Items]              
Finite-lived intangible assets acquired 0 $ 0   $ 0   $ 0  
BA Insight              
Business Acquisition [Line Items]              
Revenues since acquisition date 2,000,000   $ 2,800,000        
Objectif Lune              
Business Acquisition [Line Items]              
Revenues since acquisition date $ 5,600,000       $ 10,500,000