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Business acquisitions - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2023
USD ($)
Aug. 01, 2022
USD ($)
entity
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Business Acquisition [Line Items]              
Goodwill     $ 518,655,000   $ 518,655,000   $ 515,140,000
Revenue     469,193,000 $ 446,921,000 1,383,143,000 $ 1,452,578,000  
Iponweb              
Business Acquisition [Line Items]              
Revenue     33,618,000 $ 18,463,000 87,776,000 $ 18,463,000  
Iponweb              
Business Acquisition [Line Items]              
Business acquisition, percentage of voting interests acquired   100.00%          
Number of legal entities acquired | entity   9          
Business combination, consideration transferred   $ 290,200,000          
Business combination, contingent consideration, liability   61,200,000          
Business acquisition, equity interest issued or issuable, value assigned   $ 70,200,000          
Lock-up period   3 years          
Goodwill     $ 187,600,000   187,600,000    
Transaction costs during the period         0   12,600,000
Earnings or loss of acquiree since acquisition date         $ 9,100,000    
Iponweb | Maximum              
Business Acquisition [Line Items]              
Business combination, contingent consideration, liability   $ 100,000,000         $ 100,000,000
Brandcrush              
Business Acquisition [Line Items]              
Business combination, consideration transferred $ 7,100,000            
Goodwill 5,000,000            
Acquisition costs 700,000            
Brandcrush | Technology-based intangible assets              
Business Acquisition [Line Items]              
Intangible assets $ 3,500,000