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Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Aug. 19, 2024
Jan. 09, 2024
Oct. 02, 2023
Indefinite-lived Intangible Assets [Line Items]                  
Amortization of intangible assets       $ 350.3 $ 459.9 $ 463.1      
Customer relationships | Minimum                  
Indefinite-lived Intangible Assets [Line Items]                  
Amortization period   8 years 8 years 8 years          
Customer relationships | Maximum                  
Indefinite-lived Intangible Assets [Line Items]                  
Amortization period   23 years 23 years 23 years          
Order backlog                  
Indefinite-lived Intangible Assets [Line Items]                  
Decrease in amortisation       $ 500.0          
Order backlog | Minimum                  
Indefinite-lived Intangible Assets [Line Items]                  
Amortization period   3 years 3 years 3 years          
Order backlog | Maximum                  
Indefinite-lived Intangible Assets [Line Items]                  
Amortization period   5 years 5 years 5 years          
Technology assets                  
Indefinite-lived Intangible Assets [Line Items]                  
Amortization period   5 years 5 years 5 years          
Trade names & brands                  
Indefinite-lived Intangible Assets [Line Items]                  
Decrease in amortisation       $ 202.0          
Amortization period   3 years 3 years 3 years          
HumanFirst Inc                  
Indefinite-lived Intangible Assets [Line Items]                  
Amortization of intangible assets     $ 2.0            
Value of intangible assets acquired               $ 9.9  
Amortization period               5 years  
KCR S.A Group                  
Indefinite-lived Intangible Assets [Line Items]                  
Amortization of intangible assets   $ 1.3              
Value of intangible assets acquired             $ 45.1    
KCR S.A Group | Customer relationships                  
Indefinite-lived Intangible Assets [Line Items]                  
Value of intangible assets acquired             $ 41.4    
Amortization period             13 years    
KCR S.A Group | Order backlog                  
Indefinite-lived Intangible Assets [Line Items]                  
Value of intangible assets acquired             $ 3.7    
Amortization period             5 years    
Biotel Research LLC                  
Indefinite-lived Intangible Assets [Line Items]                  
Amortization of intangible assets $ 1.5     $ 6.1          
Value of intangible assets acquired                 $ 36.4
Biotel Research LLC | Minimum                  
Indefinite-lived Intangible Assets [Line Items]                  
Amortization period                 3 years
Biotel Research LLC | Maximum                  
Indefinite-lived Intangible Assets [Line Items]                  
Amortization period                 16 years
Biotel Research LLC | Customer relationships                  
Indefinite-lived Intangible Assets [Line Items]                  
Value of intangible assets acquired                 $ 12.5
Biotel Research LLC | Order backlog                  
Indefinite-lived Intangible Assets [Line Items]                  
Value of intangible assets acquired                 3.9
Biotel Research LLC | Technology assets                  
Indefinite-lived Intangible Assets [Line Items]                  
Value of intangible assets acquired                 $ 20.0