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Goodwill and Other Intangible Assets - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Nov. 01, 2021
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2023
USD ($)
segment
acquisition
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Finite-Lived Intangible Assets [Line Items]            
Goodwill impairment   $ 21,900   $ 0 $ 26,000  
Number of businesses acquired | acquisition       16    
Intangible assets, net   2,193,000   $ 2,081,000 2,193,000  
Accumulated Amortization   (1,915,700)   (2,178,900) (1,915,700)  
Amortization expense       321,800 348,000 $ 276,500
Estimated annual amortization expense, year one       289,800    
Estimated annual amortization expense, year two       244,000    
Estimated annual amortization expense, year three       197,400    
Estimated annual amortization expense, year four       162,600    
Estimated annual amortization expense, year five       142,400    
Estimated annual amortization expense, thereafter       512,400    
Customer relationships            
Finite-Lived Intangible Assets [Line Items]            
Accumulated Amortization   (774,000)   (893,000) (774,000)  
Mortgage servicing rights            
Finite-Lived Intangible Assets [Line Items]            
Accumulated Amortization   (469,000)   $ (556,000) (469,000)  
Intangible assets, estimated useful life       10 years    
Management contracts            
Finite-Lived Intangible Assets [Line Items]            
Accumulated Amortization   (146,000)   $ (121,000) (146,000)  
Intangible assets, estimated useful life       13 years    
Raleigh Joint Venture            
Finite-Lived Intangible Assets [Line Items]            
Cash and deferred consideration       $ 311,500    
Equity interest percentage       50.00%    
Turner & Townsend            
Finite-Lived Intangible Assets [Line Items]            
Cash and deferred consideration $ 723,000          
Equity interest percentage 60.00%          
Turner & Townsend | Customer relationships            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets, estimated useful life       20 years    
Global Workplace Solutions | Trademark            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets, estimated useful life       20 years    
Real Estate Investments            
Finite-Lived Intangible Assets [Line Items]            
Goodwill impairment   $ 21,900 $ 26,400 $ 0 26,000  
Number of businesses acquired | segment       1    
Advisory Services            
Finite-Lived Intangible Assets [Line Items]            
Goodwill impairment       $ 0 0  
Number of businesses acquired | segment       9    
Global Workplace Solutions            
Finite-Lived Intangible Assets [Line Items]            
Goodwill impairment       $ 0 $ 0  
Number of businesses acquired | segment       6