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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue $ 7,599,488 $ 7,604,491 $ 14,901,966 $ 14,772,902
Total Out of Scope of Topic 606 Revenue 120,375 166,787 229,011 331,309
Total Revenue 7,719,863 7,771,278 15,130,977 15,104,211
Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (3,529) (2,131) (7,851) (7,019)
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue (3,529) (2,131) (7,851) (7,019)
Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,922,774 2,438,084 3,670,105 4,555,545
Total Out of Scope of Topic 606 Revenue 118,899 149,899 225,436 280,886
Total Revenue 2,041,673 2,587,983 3,895,541 4,836,431
Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 5,426,062 4,908,145 10,763,784 9,713,761
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue 5,426,062 4,908,145 10,763,784 9,713,761
Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 254,181 260,393 475,928 510,615
Total Out of Scope of Topic 606 Revenue 1,476 16,888 3,575 50,423
Total Revenue 255,657 277,281 479,503 561,038
Facilities management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 3,686,548 3,820,120 7,366,709 7,620,808
Facilities management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 3,686,548 3,820,120 7,366,709 7,620,808
Project management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,739,514 1,088,025 3,397,075 2,092,953
Project management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,739,514 1,088,025 3,397,075 2,092,953
Advisory leasing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 813,952 969,708 1,522,605 1,742,430
Advisory leasing | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 813,952 969,708 1,522,605 1,742,430
Advisory sales        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 397,748 715,719 765,152 1,335,546
Advisory sales | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 397,748 715,719 765,152 1,335,546
Property management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 477,094 458,861 936,547 909,845
Property management | Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (3,529) (2,131) (7,851) (7,019)
Property management | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 480,623 460,992 944,398 916,864
Valuation        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 179,720 196,539 345,332 377,681
Valuation | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 179,720 196,539 345,332 377,681
Commercial mortgage origination        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 32,595 81,293 56,957 155,183
Total Out of Scope of Topic 606 Revenue 57,691 79,090 104,268 150,070
Commercial mortgage origination | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 32,595 81,293 56,957 155,183
Total Out of Scope of Topic 606 Revenue 57,691 79,090 104,268 150,070
Loan servicing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 18,136 13,833 35,661 27,841
Total Out of Scope of Topic 606 Revenue 61,208 70,809 121,168 130,816
Loan servicing | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 18,136 13,833 35,661 27,841
Total Out of Scope of Topic 606 Revenue 61,208 70,809 121,168 130,816
Investment management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 151,327 157,554 298,817 308,121
Investment management | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 151,327 157,554 298,817 308,121
Development services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 102,854 102,839 177,111 202,494
Total Out of Scope of Topic 606 Revenue 1,476 16,888 3,575 50,423
Development services | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 102,854 102,839 177,111 202,494
Total Out of Scope of Topic 606 Revenue $ 1,476 $ 16,888 $ 3,575 $ 50,423