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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue									$ 23,170,119	$ 23,274,086	$ 20,778,100
Total Out of Scope of Topic 606 Revenue									656,076	620,005	561,988
Total revenue	$ 6,910,501	$ 5,645,142	$ 5,381,384	$ 5,889,168	$ 7,119,407	$ 5,925,101	$ 5,714,073	$ 5,135,510	23,826,195	23,894,091	21,340,088
Advisory Services
Disaggregation of Revenue [Line Items]
Revenue									7,058,120	8,471,939	7,878,014
Total Out of Scope of Topic 606 Revenue									640,872	597,529	561,988
Total revenue									7,698,992	9,069,468	8,440,002
Global Workplace Solutions
Disaggregation of Revenue [Line Items]
Revenue									15,295,673	14,164,001	12,365,362
Total Out of Scope of Topic 606 Revenue									0	0	0
Total revenue									15,295,673	14,164,001	12,365,362
Real Estate Investments
Disaggregation of Revenue [Line Items]
Revenue									816,326	638,146	534,724
Total Out of Scope of Topic 606 Revenue									15,204	22,476	0
Total revenue									831,530	660,622	534,724
Global Workplace Solutions
Disaggregation of Revenue [Line Items]
Revenue									15,295,673	14,164,001	12,365,362
Global Workplace Solutions | Advisory Services
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Global Workplace Solutions | Global Workplace Solutions
Disaggregation of Revenue [Line Items]
Revenue									15,295,673	14,164,001	12,365,362
Global Workplace Solutions | Real Estate Investments
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Advisory leasing
Disaggregation of Revenue [Line Items]
Revenue									2,404,273	3,269,993	3,080,117
Advisory leasing | Advisory Services
Disaggregation of Revenue [Line Items]
Revenue									2,404,273	3,269,993	3,080,117
Advisory leasing | Global Workplace Solutions
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Advisory leasing | Real Estate Investments
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Advisory sales
Disaggregation of Revenue [Line Items]
Revenue									1,658,702	2,130,979	1,980,932
Advisory sales | Advisory Services
Disaggregation of Revenue [Line Items]
Revenue									1,658,702	2,130,979	1,980,932
Advisory sales | Global Workplace Solutions
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Advisory sales | Real Estate Investments
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Property and advisory project management
Disaggregation of Revenue [Line Items]
Revenue									2,204,263	2,255,398	2,057,433
Property and advisory project management | Advisory Services
Disaggregation of Revenue [Line Items]
Revenue									2,204,263	2,255,398	2,057,433
Property and advisory project management | Global Workplace Solutions
Disaggregation of Revenue [Line Items]
Revenue										0	0
Property and advisory project management | Real Estate Investments
Disaggregation of Revenue [Line Items]
Revenue										0	0
Valuation
Disaggregation of Revenue [Line Items]
Revenue									614,307	630,399	598,806
Valuation | Advisory Services
Disaggregation of Revenue [Line Items]
Revenue									614,307	630,399	598,806
Valuation | Global Workplace Solutions
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Valuation | Real Estate Investments
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Commercial mortgage origination
Disaggregation of Revenue [Line Items]
Revenue									130,883	154,227	136,534
Total Out of Scope of Topic 606 Revenue									446,968	421,736	402,814
Commercial mortgage origination | Advisory Services
Disaggregation of Revenue [Line Items]
Revenue									130,883	154,227	136,534
Total Out of Scope of Topic 606 Revenue									446,968	421,736	402,814
Commercial mortgage origination | Global Workplace Solutions
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Total Out of Scope of Topic 606 Revenue									0	0	0
Commercial mortgage origination | Real Estate Investments
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Total Out of Scope of Topic 606 Revenue									0	0	0
Loan servicing
Disaggregation of Revenue [Line Items]
Revenue									45,692	30,943	24,192
Total Out of Scope of Topic 606 Revenue									193,904	175,793	159,174
Loan servicing | Advisory Services
Disaggregation of Revenue [Line Items]
Revenue									45,692	30,943	24,192
Total Out of Scope of Topic 606 Revenue									193,904	175,793	159,174
Loan servicing | Global Workplace Solutions
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Total Out of Scope of Topic 606 Revenue									0	0	0
Loan servicing | Real Estate Investments
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Total Out of Scope of Topic 606 Revenue									0	0	0
Investment management
Disaggregation of Revenue [Line Items]
Revenue									474,939	424,882	434,405
Investment management | Advisory Services
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Investment management | Global Workplace Solutions
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Investment management | Real Estate Investments
Disaggregation of Revenue [Line Items]
Revenue									474,939	424,882	434,405
Development services
Disaggregation of Revenue [Line Items]
Revenue									341,387	213,264	100,319
Total Out of Scope of Topic 606 Revenue									15,204	22,476
Development services | Advisory Services
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Total Out of Scope of Topic 606 Revenue									0	0
Development services | Global Workplace Solutions
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
Total Out of Scope of Topic 606 Revenue									0	0
Development services | Real Estate Investments
Disaggregation of Revenue [Line Items]
Revenue									341,387	213,264	$ 100,319
Total Out of Scope of Topic 606 Revenue									$ 15,204	$ 22,476

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