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Goodwill - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 19, 2025
Aug. 19, 2024
Jan. 09, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Line Items]                  
Goodwill impairment       $ 165,300 $ 0 $ 165,300 $ 0 $ 0  
Purchase of subsidiary undertakings (net of cash acquired)           2,537 $ 85,629    
Goodwill       $ 8,927,323   8,927,323   9,051,410 $ 9,022,075
Prior period acquisitions           5,108   $ 0  
KCR S.A Group                  
Goodwill [Line Items]                  
Business combination, consideration transferred   $ 92,500              
Purchase of subsidiary undertakings (net of cash acquired)           1,300      
Goodwill   43,400              
Intangible assets acquired   45,100              
Prior period acquisitions $ 5,100                
KCR S.A Group | Customer relationships                  
Goodwill [Line Items]                  
Intangible assets acquired   41,400              
KCR S.A Group | Order backlog                  
Goodwill [Line Items]                  
Intangible assets acquired   $ 3,700              
HumanFirst Inc                  
Goodwill [Line Items]                  
Business combination, consideration transferred     $ 13,300            
Purchase of subsidiary undertakings (net of cash acquired)           $ 1,200      
Goodwill     2,700            
Intangible assets acquired     $ 9,900