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Goodwill and Other Intangible Assets - Narrative (Details)
 3 Months Ended 12 Months Ended
Jan. 01, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
acquisition
Dec. 31, 2020
USD ($)
acquisition
Dec. 31, 2019
USD ($)
Nov. 01, 2021
USD ($)
Finite-Lived Intangible Assets [Line Items]            
Reallocation     $ 0      
Goodwill impairment $ 0 $ 25,000,000 $ 0 $ 25,000,000    
Number of in-fill acquisitions completed | acquisition     8 6    
Other intangible assets     $ 2,409,427,000 $ 1,367,913,000    
Other intangible assets, accumulated amortization     1,725,280,000 1,556,537,000    
Intangible assets     3,742,330,000 2,800,228,000    
Amortization expense     276,500,000 227,100,000 $ 225,700,000  
Estimated annual amortization expense, year one     309,800,000      
Estimated annual amortization expense, year two     284,600,000      
Estimated annual amortization expense, year three     248,500,000      
Estimated annual amortization expense, year four     201,300,000      
Estimated annual amortization expense, year five     161,400,000      
Global Workplace Solutions            
Finite-Lived Intangible Assets [Line Items]            
Reallocation 101,400,000   101,390,000      
Goodwill impairment     0 0    
Advisory Services            
Finite-Lived Intangible Assets [Line Items]            
Reallocation $ (101,400,000)          
Real Estate Investments            
Finite-Lived Intangible Assets [Line Items]            
Reallocation     0      
Goodwill impairment     0 25,000,000    
Intangible asset impairment       6,000,000 $ 89,800,000  
Customer relationships            
Finite-Lived Intangible Assets [Line Items]            
Other intangible assets, accumulated amortization     667,668,000 603,866,000    
Intangible assets     1,612,308,000 880,104,000    
Mortgage servicing rights            
Finite-Lived Intangible Assets [Line Items]            
Other intangible assets, accumulated amortization     $ 426,841,000 370,634,000    
Intangible assets, amortization period     10 years      
Intangible assets     $ 1,005,357,000 927,525,000    
Management contracts            
Finite-Lived Intangible Assets [Line Items]            
Other intangible assets, accumulated amortization     $ 137,906,000 145,612,000    
Intangible assets, amortization period     13 years      
Intangible assets     $ 151,912,000 152,312,000    
Amortizable trade name and customer relationships | Global Workplace Solutions            
Finite-Lived Intangible Assets [Line Items]            
Intangible asset impairment       28,500,000    
Trademarks/Trade names            
Finite-Lived Intangible Assets [Line Items]            
Other intangible assets, accumulated amortization     126,468,000 111,595,000    
Intangible assets     $ 350,548,000 $ 354,060,000    
Global Workplace Solutions | Trademark            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets, amortization period     20 years      
Intangible assets     $ 280,000,000      
Turner & Townsend | Customer relationships            
Finite-Lived Intangible Assets [Line Items]            
Other intangible assets, accumulated amortization     $ 753,900,000      
Other intangible assets, net           $ 753,935,000
Intangible assets, amortization period     20 years      
Telford Homes | Trademarks/Trade names            
Finite-Lived Intangible Assets [Line Items]            
Other intangible assets, net     $ 26,700,000      
Intangible assets, amortization period     20 years