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Acquisitions - Narrative (Details)
$ in Millions
 12 Months Ended
Nov. 01, 2021
USD ($)
Dec. 31, 2023
USD ($)
acquisition
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]          
Number of businesses acquired | acquisition   16      
Revenue   $ 31,949.0 $ 30,828.0 $ 27,746.0  
Operating income   1,117.0 1,512.0 1,637.0  
Net loss   1,277.0 1,658.0 2,410.0  
Direct transaction and integration costs   62.0 $ 40.0 44.0  
Turner & Townsend          
Business Acquisition [Line Items]          
Noncontrolling interest, noncontrolling owners percent 40.00%        
Turner & Townsend          
Business Acquisition [Line Items]          
Cash and deferred consideration $ 723.0        
Equity interest percentage 60.00%        
Deferred consideration, gross $ 591.2        
Deferred consideration, discount 96.9        
Goodwill deductible amount $ 0.0        
Revenue       194.0  
Operating income       0.5  
Net loss       (0.5)  
Direct transaction and integration costs       44.6  
Noncontrolling interest, fair value calculation, percentage of equity interest used in calculation 100.00%        
Increased amortization expense       81.3 $ 97.5
Increased depreciation expense       $ 5.5 $ 6.6
Turner & Townsend | Minimum          
Business Acquisition [Line Items]          
Contractual payment date period 3 years        
Turner & Townsend | Maximum          
Business Acquisition [Line Items]          
Contractual payment date period 4 years        
Raleigh Joint Venture          
Business Acquisition [Line Items]          
Cash and deferred consideration   $ 311.5      
Equity interest percentage   50.00%