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Long-Term Debt and Short-Term Borrowings - Revolving Credit Facility Narrative (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
Jan. 01, 2022
Dec. 31, 2021
GBP (£)
Debt Instrument [Line Items]      
Letters of credit outstanding amount $ 159,100,000    
Subsequent Event      
Debt Instrument [Line Items]      
Credit Spread Adjustment Rate   0.0326%  
Revolving credit facility | Turner & Townsend      
Debt Instrument [Line Items]      
Amounts available to borrow under credit agreement | £     £ 80,000,000
Line of credit utilized $ 27,000,000    
Revolving credit facility | Turner & Townsend | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Line of credit over LIBOR rate 0.75%    
Revolving credit facility | Minimum | Turner & Townsend | SONIA Overnight Rate      
Debt Instrument [Line Items]      
Line of credit over LIBOR rate 1.0266%    
Revolving credit facility | Maximum | Turner & Townsend | SONIA Overnight Rate      
Debt Instrument [Line Items]      
Line of credit over LIBOR rate 2.0266%    
Revolving credit facility | 2021 Credit Agreement      
Debt Instrument [Line Items]      
Amounts available to borrow under credit agreement $ 3,150,000,000    
Line of credit utilized 0    
Letters of credit outstanding amount $ 2,000,000    
Revolving credit facility | 2021 Credit Agreement | Minimum      
Debt Instrument [Line Items]      
Credit Agreement applicable fixed rate spread 0.68%    
Credit Agreement applicable daily rate spread 0.00%    
Revolving credit facility | 2021 Credit Agreement | Maximum      
Debt Instrument [Line Items]      
Credit Agreement applicable fixed rate spread 1.075%    
Credit Agreement applicable daily rate spread 0.075%    
Revolving credit facility | 2021 Credit Agreement | Canadian, Australian and New Zealand subsidiaries      
Debt Instrument [Line Items]      
Amounts available to borrow under credit agreement $ 200,000,000    
Revolving credit facility | 2021 Credit Agreement | U.K. subsidiaries      
Debt Instrument [Line Items]      
Amounts available to borrow under credit agreement $ 320,000,000