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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue $ 7,729,834 $ 7,378,494 $ 22,631,803 $ 22,151,396
Total Out of Scope of Topic 606 Revenue 138,212 151,052 367,222 482,361
Total Revenue 7,868,046 7,529,546 22,999,025 22,633,757
Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (3,849) (5,732) (11,700) (12,751)
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue (3,849) (5,732) (11,700) (12,751)
Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,881,724 2,298,650 5,551,831 6,854,196
Total Out of Scope of Topic 606 Revenue 131,109 135,151 356,544 416,036
Total Revenue 2,012,833 2,433,801 5,908,375 7,270,232
Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 5,648,687 4,843,739 16,412,471 14,557,500
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue 5,648,687 4,843,739 16,412,471 14,557,500
Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 203,272 241,837 679,201 752,451
Total Out of Scope of Topic 606 Revenue 7,103 15,901 10,678 66,325
Total Revenue 210,375 257,738 689,879 818,776
Facilities management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 3,843,347 3,671,930 11,210,057 11,292,738
Facilities management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 3,843,347 3,671,930 11,210,057 11,292,738
Project management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,805,340 1,171,809 5,202,414 3,264,762
Project management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,805,340 1,171,809 5,202,414 3,264,762
Advisory leasing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 827,498 989,615 2,350,103 2,732,045
Advisory leasing | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 827,498 989,615 2,350,103 2,732,045
Advisory sales        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 369,819 600,527 1,134,971 1,936,073
Advisory sales | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 369,819 600,527 1,134,971 1,936,073
Property management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 461,109 452,560 1,397,657 1,362,405
Property management | Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (3,849) (5,732) (11,700) (12,751)
Property management | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 464,958 458,292 1,409,357 1,375,156
Valuation        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 163,101 177,198 508,433 554,879
Valuation | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 163,101 177,198 508,433 554,879
Commercial mortgage origination        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 36,903 59,149 93,861 214,333
Total Out of Scope of Topic 606 Revenue 69,882 71,276 174,149 221,345
Commercial mortgage origination | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 36,903 59,149 93,861 214,333
Total Out of Scope of Topic 606 Revenue 69,882 71,276 174,149 221,345
Loan servicing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 19,445 13,869 55,106 41,710
Total Out of Scope of Topic 606 Revenue 61,227 63,875 182,395 194,691
Loan servicing | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 19,445 13,869 55,106 41,710
Total Out of Scope of Topic 606 Revenue 61,227 63,875 182,395 194,691
Investment management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 136,797 146,695 435,614 454,816
Investment management | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 136,797 146,695 435,614 454,816
Development services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 66,475 95,142 243,587 297,635
Total Out of Scope of Topic 606 Revenue 7,103 15,901 10,678 66,325
Development services | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 66,475 95,142 243,587 297,635
Total Out of Scope of Topic 606 Revenue $ 7,103 $ 15,901 $ 10,678 $ 66,325