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Business Combinations - Narrative (Details)
£ in Millions, $ in Millions
Nov. 27, 2020
USD ($)
Nov. 24, 2020
USD ($)
Mar. 06, 2020
USD ($)
Mar. 06, 2020
GBP (£)
Jun. 12, 2019
Customer relationships, contracts and backlog intangible          
Business Acquisition [Line Items]          
Useful life of acquired intangible assets         9 years
Buffalo Group          
Business Acquisition [Line Items]          
Consideration transferred   $ 212.8      
Consideration paid in cash   181.4      
Debt assumed   7.7      
Other assumed liabilities   23.7      
Contingent consideration   $ 14.6      
Wood Group          
Business Acquisition [Line Items]          
Enterprise value on debt-free, cash-free basis (USD, GBP)     $ 317.9 £ 246  
Wood Group | Customer relationships, contracts and backlog intangible          
Business Acquisition [Line Items]          
Useful life of acquired intangible assets     12 years 12 years  
Wood Group | Developed technology intangible          
Business Acquisition [Line Items]          
Useful life of acquired intangible assets     15 years 15 years  
PA Consulting Group Limited          
Business Acquisition [Line Items]          
Consideration transferred $ 1,800.0        
Outstanding shares acquired (as a percent) 65.00%