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Parent Company Information - Narrative (Details) - USD ($)
12 Months Ended
Sep. 01, 2015
Nov. 05, 2014
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jul. 12, 2018
Aug. 21, 2014
Business Acquisition [Line Items]              
Ordinary shares, nominal value per share (in dollars per share)     $ 0.10 $ 0.10   $ 0.01  
Excess of consolidated net assets     25.00%        
Restricted net assets     $ 1,500,000,000        
Cash dividend not paid     $ 0 $ 0 $ 0    
DTZ Group              
Business Acquisition [Line Items]              
Percentage acquired             100.00%
DTZ Group | DTZ Jersey Holdings Limited              
Business Acquisition [Line Items]              
Cash paid   $ 1,100,000,000          
C&W Group, Inc.              
Business Acquisition [Line Items]              
Percentage acquired 100.00%            
C&W Group, Inc. | DTZ Jersey Holdings Limited              
Business Acquisition [Line Items]              
Percentage acquired 100.00% 100.00%          
Cash paid $ 1,900,000,000 $ 1,100,000,000