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Basis of Presentation (Details) - USD ($)
shares in Millions
Nov. 19, 2021
Mar. 02, 2021
Nov. 24, 2020
Apr. 26, 2019
Oct. 01, 2021
Worley Stock          
Business Acquisition [Line Items]          
Ordinary shares included in purchase price (in shares)       58.2  
Worley          
Business Acquisition [Line Items]          
Consideration transferred       $ 3,400,000,000  
Consideration paid in cash       $ 2,800,000,000  
Discontinued Operations | Worley          
Business Acquisition [Line Items]          
Assets held for sale         $ 0
PA Consulting Employees          
Business Acquisition [Line Items]          
Ownership interest of employees   35.00%      
BlackLynx          
Business Acquisition [Line Items]          
Net assets acquired $ 236,200,000        
Consideration paid in cash 234,900,000        
Contingent consideration 1,300,000        
Debt assumed $ 5,300,000        
PA Consulting Group Limited          
Business Acquisition [Line Items]          
Consideration transferred   $ 1,700,000,000      
Net assets acquired   $ 1,701,900,000      
Percentage of outstanding shares of common and preferred stock acquired   65.00%      
Consideration received from acquiree   $ 261,000,000      
Redeemable Noncontrolling interests   $ 582,400,000      
Buffalo Group          
Business Acquisition [Line Items]          
Consideration transferred     $ 190,100,000    
Net assets acquired     190,100,000    
Consideration paid in cash     182,400,000    
Contingent consideration     7,700,000    
Debt assumed     $ 7,700,000