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Transformation Initiatives - Summary of Transformation Initiative Costs (Details) - Transformation Initiatives - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | $ 175,840 |
Employee separation benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 91,077 |
Lease termination costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 47,811 |
Professional fees and other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 16,260 |
Subtotal |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs | $ 0 | 155,148 | $ 0
Depreciation expense |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 20,692 |
Advisory Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 128,171 |
Advisory Services | Employee separation benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 57,550 |
Advisory Services | Lease termination costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 43,225 |
Advisory Services | Professional fees and other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 13,212 |
Advisory Services | Subtotal |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 113,987 |
Advisory Services | Depreciation expense |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 14,184 |
Global Workplace Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 38,345 |
Global Workplace Solutions | Employee separation benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 31,083 |
Global Workplace Solutions | Lease termination costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 4,586 |
Global Workplace Solutions | Professional fees and other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 2,510 |
Global Workplace Solutions | Subtotal |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 38,179 |
Global Workplace Solutions | Depreciation expense |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 166 |
Real Estate Investments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 9,324 |
Real Estate Investments | Employee separation benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 2,444 |
Real Estate Investments | Lease termination costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 0 |
Real Estate Investments | Professional fees and other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 538 |
Real Estate Investments | Subtotal |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | 2,982 |
Real Estate Investments | Depreciation expense |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total transformation initiative costs |  | $ 6,342 |

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