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Related Party Transactions - Narrative (Details)
property in Thousands, employee in Thousands, $ in Millions
Jan. 06, 2020
USD ($)
employee
property
city
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Corporate Joint Venture      
Related Party Transaction [Line Items]      
Number of commercial properties | property 1    
Number of cities | city 80    
Number of employees | employee 20    
Gain from formation of Joint Venture $ 36.9    
Corporate Joint Venture | Cushman & Wakefield Vanke Service      
Related Party Transaction [Line Items]      
Interest in joint venture 35.00%    
Affiliates      
Related Party Transaction [Line Items]      
Accounts receivable, related parties, current   $ 33.2 $ 33.4
Accounts receivable, related parties, noncurrent   $ 190.6 $ 198.8