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Efficiency and Cost-Reduction Initiatives - Transformation and workforce optimization (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2023
Efficiency And Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,300	$ 147,200	$ 149,536
Efficiency And Cost Reduction | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges			4,906
Efficiency And Cost Reduction | Advisory Services | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			69,847
Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			49,842
Efficiency And Cost Reduction | Real estate investments (in projects and funds) | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			24,941
Employee separation benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges			64,712
Employee separation benefits | Efficiency And Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges			64,712
Employee separation benefits | Efficiency And Cost Reduction | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges			2,538
Employee separation benefits | Efficiency And Cost Reduction | Advisory Services | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			19,158
Employee separation benefits | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			29,858
Employee separation benefits | Efficiency And Cost Reduction | Real estate investments (in projects and funds) | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			13,158
Lease exit costs | Efficiency And Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges			45,351
Lease exit costs | Efficiency And Cost Reduction | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1,143
Lease exit costs | Efficiency And Cost Reduction | Advisory Services | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			39,273
Lease exit costs | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			731
Lease exit costs | Efficiency And Cost Reduction | Real estate investments (in projects and funds) | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			4,204
Professional fees and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges			30,494
Professional fees and other | Efficiency And Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges			30,494
Professional fees and other | Efficiency And Cost Reduction | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1,225
Professional fees and other | Efficiency And Cost Reduction | Advisory Services | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			5,963
Professional fees and other | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			19,209
Professional fees and other | Efficiency And Cost Reduction | Real estate investments (in projects and funds) | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			4,097
Subtotal | Efficiency And Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges			140,557
Subtotal | Efficiency And Cost Reduction | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges			4,906
Subtotal | Efficiency And Cost Reduction | Advisory Services | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			64,394
Subtotal | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			49,798
Subtotal | Efficiency And Cost Reduction | Real estate investments (in projects and funds) | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			21,459
Depreciation expense | Efficiency And Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges			8,979
Depreciation expense | Efficiency And Cost Reduction | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0
Depreciation expense | Efficiency And Cost Reduction | Advisory Services | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			5,453
Depreciation expense | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			44
Depreciation expense | Efficiency And Cost Reduction | Real estate investments (in projects and funds) | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 3,482

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