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Goodwill and Other Intangible Assets - Narrative (Details)
 3 Months Ended 12 Months Ended 19 Months Ended
Jan. 01, 2019
segment
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
acquisition
Dec. 31, 2019
USD ($)
acquisition
Dec. 31, 2018
USD ($)
acquisition
Dec. 31, 2019
USD ($)
Finite-Lived Intangible Assets [Line Items]            
Global business segments | segment 3          
Goodwill impairment   $ 25,000,000.0 $ 25,000,000 $ 0    
Number of in-fill acquisitions completed | acquisition     6 8 6  
Equity interest acquired         50.00%  
Other intangible assets     $ 1,367,913,000 $ 1,379,546,000   $ 1,379,546,000
Other intangible assets, accumulated amortization     1,556,537,000 1,358,528,000   1,358,528,000
Intangible assets     2,800,228,000 2,612,936,000   2,612,936,000
Amortization expense     227,100,000 225,700,000 $ 258,700,000  
Estimated annual amortization expense, 2021     202,400,000      
Estimated annual amortization expense, 2022     180,100,000      
Estimated annual amortization expense, 2023     156,200,000      
Estimated annual amortization expense, 2024     134,200,000      
Estimated annual amortization expense, 2025     115,600,000      
Global Workplace Solutions            
Finite-Lived Intangible Assets [Line Items]            
Goodwill impairment     0      
Real Estate Investments            
Finite-Lived Intangible Assets [Line Items]            
Goodwill impairment     25,000,000      
Intangible asset impairment     6,000,000.0 89,800,000    
Customer relationships            
Finite-Lived Intangible Assets [Line Items]            
Other intangible assets, accumulated amortization     $ 603,866,000 519,162,000   519,162,000
Intangible assets, amortization period     20 years      
Intangible assets     $ 880,104,000 857,772,000   857,772,000
Mortgage servicing rights            
Finite-Lived Intangible Assets [Line Items]            
Other intangible assets, accumulated amortization     $ 370,634,000 319,927,000   319,927,000
Intangible assets, amortization period     10 years      
Intangible assets     $ 927,525,000 803,419,000   803,419,000
Management contracts            
Finite-Lived Intangible Assets [Line Items]            
Other intangible assets, accumulated amortization     $ 145,612,000 138,891,000   138,891,000
Intangible assets, amortization period     13 years      
Intangible assets     $ 152,312,000 142,767,000   142,767,000
Amortizable trade name and customer relationships | Global Workplace Solutions            
Finite-Lived Intangible Assets [Line Items]            
Intangible asset impairment     $ 28,500,000      
FacilitySource            
Finite-Lived Intangible Assets [Line Items]            
Final net purchase price           $ 266,500,000
Cash paid to acquire business       $ 3,500,000 $ 263,000,000.0  
New England Joint Venture            
Finite-Lived Intangible Assets [Line Items]            
Equity interest acquired         50.00%  
Telford Homes | Trademark            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets, amortization period     20 years      
Intangible assets     $ 26,700,000      
Global Workplace Solutions | Trademark            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets, amortization period     20 years      
Intangible assets     $ 280,000,000