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Goodwill - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Aug. 19, 2024
Jan. 09, 2024
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Acquired Finite-Lived Intangible Assets [Line Items]            
Purchase of subsidiary undertakings (net of cash acquired)     $ 85,629 $ 5,100    
Goodwill     9,085,447   $ 9,022,075 $ 8,971,670
Goodwill, impairment loss     0   $ 0  
HumanFirst Inc            
Acquired Finite-Lived Intangible Assets [Line Items]            
Business combination, consideration transferred   $ 13,300        
Payments to acquire businesses, net of cash acquired   7,800        
Purchase of subsidiary undertakings (net of cash acquired)   11,800        
Cash acquired from acquisition   4,000        
Deferred consideration     1,500      
Goodwill   2,700        
Intangible assets acquired   $ 9,900        
KCR S.A Group            
Acquired Finite-Lived Intangible Assets [Line Items]            
Business combination, consideration transferred $ 95,100          
Payments to acquire businesses, net of cash acquired 77,800          
Purchase of subsidiary undertakings (net of cash acquired) 89,700          
Cash acquired from acquisition 11,900          
Deferred consideration     $ 1,100      
Goodwill 50,300          
Intangible assets acquired 30,800          
Fair value of contingent consideration $ 4,300