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Segments - Summarized Financial Information by Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Revenue $ 30,828,246 $ 27,746,036 $ 23,826,195
Depreciation and amortization 613,088 525,871 501,728
Equity income from unconsolidated subsidiaries 228,998 618,697 126,161
Segment Operating Profit 1,511,915 1,637,467 969,759
Operating Segments      
Segment Reporting Information [Line Items]      
Segment Operating Profit 3,327,339 3,291,267 2,180,825
Corporate And Reconciling Items      
Segment Reporting Information [Line Items]      
Revenue (16,090) (20,356) (27,930)
Depreciation and amortization 33,002 28,606 28,533
Equity income from unconsolidated subsidiaries (167,348) 36,858 (2,003)
Segment Operating Profit 578,228 216,855 284,561
Advisory Services | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 9,883,506 9,575,759 7,214,562
Depreciation and amortization 310,823 311,397 311,445
Equity income from unconsolidated subsidiaries 14,662 24,778 4,526
Segment Operating Profit 1,909,924 2,063,227 1,347,826
Global Workplace Solutions | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 19,851,221 17,098,917 15,808,033
Depreciation and amortization 253,013 158,757 134,383
Equity income from unconsolidated subsidiaries 1,118 1,720 90
Segment Operating Profit 899,221 708,039 575,299
Real Estate Investments | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 1,109,609 1,091,716 831,530
Depreciation and amortization 16,250 27,111 27,367
Equity income from unconsolidated subsidiaries 380,566 555,341 123,548
Segment Operating Profit $ 518,194 $ 520,001 $ 257,700