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Long-Term Debt and Short-Term Borrowings - Short Term Borrowings - Narrative (Detail)
€ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
EUR (€)
Jun. 30, 2022
USD ($)
Jun. 30, 2022
EUR (€)
Mar. 30, 2022
EUR (€)
Jan. 01, 2022
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]            
Revolving credit facility   $ 310,000,000       $ 0
Letters of credit outstanding amount   176,300,000        
2021 Credit Agreement | Revolving credit facility            
Debt Instrument [Line Items]            
Amounts available to borrow under credit agreement   3,150,000,000        
Credit spread adjustment rate         0.0326%  
Revolving credit facility   310,000,000        
Letters of credit outstanding amount   $ 2,000,000        
2021 Credit Agreement | Revolving credit facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Line of credit over LIBOR rate   0.90%        
2021 Credit Agreement | Revolving credit facility | Minimum            
Debt Instrument [Line Items]            
Credit Agreement applicable fixed rate spread   0.68%        
Credit Agreement applicable daily rate spread   0.00%        
2021 Credit Agreement | Revolving credit facility | Maximum            
Debt Instrument [Line Items]            
Credit Agreement applicable fixed rate spread   1.075%        
Credit Agreement applicable daily rate spread   0.075%        
2021 Credit Agreement | Canadian, Australian and New Zealand subsidiaries | Revolving credit facility            
Debt Instrument [Line Items]            
Amounts available to borrow under credit agreement   $ 200,000,000        
2021 Credit Agreement | U.K. subsidiaries | Revolving credit facility            
Debt Instrument [Line Items]            
Amounts available to borrow under credit agreement   320,000,000        
2022 Credit Agreement | Revolving credit facility | Turner & Townsend Holdings Limited            
Debt Instrument [Line Items]            
Amounts available to borrow under credit agreement | €       € 80.0    
2027 Credit Agreement | Revolving credit facility | Turner & Townsend Holdings Limited            
Debt Instrument [Line Items]            
Amounts available to borrow under credit agreement | € € 120.0          
Revolving credit facility   $ 24,400,000 € 20.0      
Additional accordion option | € € 20.0          
2027 Credit Agreement | Revolving credit facility | Turner & Townsend Holdings Limited | SONIA            
Debt Instrument [Line Items]            
Line of credit over LIBOR rate 0.75%          
2027 Credit Agreement | Revolving credit facility | Minimum | Turner & Townsend Holdings Limited | SONIA            
Debt Instrument [Line Items]            
Line of credit over LIBOR rate   0.75%        
2027 Credit Agreement | Revolving credit facility | Maximum | Turner & Townsend Holdings Limited | SONIA            
Debt Instrument [Line Items]            
Line of credit over LIBOR rate   1.75%