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Efficiency and Cost-Reduction Initiatives - Transformation and workforce optimization (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 138,200
Efficiency And Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges	147,248
Efficiency And Cost Reduction | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,866
Efficiency And Cost Reduction | Advisory Services | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	67,978
Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	49,467
Efficiency And Cost Reduction | Real estate investments (in projects and funds) | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	24,937
Employee separation benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	61,765
Employee separation benefits | Efficiency And Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges	61,765
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	17,175
Employee separation benefits | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	28,894
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 termination costs | Efficiency And Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges	45,351
Lease termination costs | Efficiency And Cost Reduction | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,143
Lease termination costs | Efficiency And Cost Reduction | Advisory Services | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	39,273
Lease termination costs | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	731
Lease termination 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	31,131
Professional fees and other | Efficiency And Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges	31,131
Professional fees and other | Efficiency And Cost Reduction | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,185
Professional fees and other | Efficiency And Cost Reduction | Advisory Services | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6,090
Professional fees and other | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	19,763
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	4,093
Subtotal | Efficiency And Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges	138,247
Subtotal | Efficiency And Cost Reduction | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,866
Subtotal | Efficiency And Cost Reduction | Advisory Services | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	62,538
Subtotal | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	49,388
Subtotal | Efficiency And Cost Reduction | Real estate investments (in projects and funds) | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	21,455
Depreciation expense | Efficiency And Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges	9,001
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	5,440
Depreciation expense | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	79
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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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
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-URI https://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
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-URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(1))
-URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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