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Segments - Summarized Financial Information by Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Revenue $ 27,746,036 $ 23,826,195 $ 23,894,091
Depreciation and amortization 525,871 501,728 439,224
Equity income from unconsolidated subsidiaries 618,697 126,161 160,925
Segment Operating Profit 1,637,467 969,759 1,259,875
Operating Segments      
Segment Reporting Information [Line Items]      
Segment Operating Profit 3,291,267 2,180,825 2,376,392
Corporate And Reconciling Items      
Segment Reporting Information [Line Items]      
Revenue (20,356) (27,930) (22,987)
Depreciation and amortization 28,606 28,533 20,044
Equity income from unconsolidated subsidiaries 36,858 (2,003) 3,288
Segment Operating Profit 216,855 284,561 303,516
Advisory Services | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 9,575,759 7,214,562 8,654,637
Depreciation and amortization 311,397 311,445 275,270
Equity income from unconsolidated subsidiaries 24,778 4,526 3,110
Segment Operating Profit 2,063,227 1,347,826 1,690,959
Global Workplace Solutions | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 17,098,917 15,808,033 14,601,819
Depreciation and amortization 158,757 134,383 130,427
Equity income from unconsolidated subsidiaries 1,720 90 (927)
Segment Operating Profit 708,039 575,299 475,767
Real Estate Investments | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 1,091,716 831,530 660,622
Depreciation and amortization 27,111 27,367 13,483
Equity income from unconsolidated subsidiaries 555,341 123,548 155,454
Segment Operating Profit $ 520,001 $ 257,700 $ 209,666