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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue $ 7,302,479 $ 7,168,411
Total Out of Scope of Topic 606 Revenue 108,635 164,522
Total Revenue 7,411,114 7,332,933
Corporate, other and eliminations    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue (4,322) (4,888)
Total Out of Scope of Topic 606 Revenue 0 0
Total Revenue (4,322) (4,888)
Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 1,747,332 2,117,461
Total Out of Scope of Topic 606 Revenue 106,536 130,987
Total Revenue 1,853,868 2,248,448
Global Workplace Solutions | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 5,337,722 4,805,616
Total Out of Scope of Topic 606 Revenue 0 0
Total Revenue 5,337,722 4,805,616
Real Estate Investments | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 221,747 250,222
Total Out of Scope of Topic 606 Revenue 2,099 33,535
Total Revenue 223,846 283,757
Facilities management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 3,680,162 3,800,688
Facilities management | Global Workplace Solutions | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 3,680,162 3,800,688
Project management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 1,657,560 1,004,928
Project management | Global Workplace Solutions | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 1,657,560 1,004,928
Advisory leasing    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 708,654 772,722
Advisory leasing | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 708,654 772,722
Advisory sales    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 367,404 619,827
Advisory sales | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 367,404 619,827
Property management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 459,452 450,984
Property management | Corporate, other and eliminations    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue (4,322) (4,888)
Property management | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 463,774 455,872
Valuation    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 165,612 181,142
Valuation | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 165,612 181,142
Commercial mortgage origination    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 24,363 73,890
Total Out of Scope of Topic 606 Revenue 46,577 70,980
Commercial mortgage origination | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 24,363 73,890
Total Out of Scope of Topic 606 Revenue 46,577 70,980
Loan servicing    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 17,525 14,008
Total Out of Scope of Topic 606 Revenue 59,959 60,007
Loan servicing | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 17,525 14,008
Total Out of Scope of Topic 606 Revenue 59,959 60,007
Investment management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 147,490 150,567
Investment management | Real Estate Investments | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 147,490 150,567
Development services    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 74,257 99,655
Total Out of Scope of Topic 606 Revenue 2,099 33,535
Development services | Real Estate Investments | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 74,257 99,655
Total Out of Scope of Topic 606 Revenue $ 2,099 $ 33,535