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J&J Worldwide Services Acquisition - Narrative (Details) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 27, 2024 USD ($) | Jun. 30, 2024 USD ($) acquisition | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) acquisition segement | Jun. 30, 2023 USD ($) | Feb. 23, 2024 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenue |  | $ 8,391,000,000 |  |  | $ 7,720,000,000 | $ 16,326,000,000 | $ 15,131,000,000 |
Operating income (loss) |  | 246,000,000 |  |  | 306,000,000 | 450,000,000 | 344,000,000 |
Operational net income |  | $ 174,000,000 |  |  | 261,000,000 | $ 293,000,000 | 415,000,000 |
Advisory Services |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of businesses acquired | segement |  |  |  |  |  | 1 |  |
Global Workplace Solutions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of businesses acquired | acquisition |  | 5 |  |  |  | 4 |  |
5.500% Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 500,000,000.0
Interest rate |  | 5.50% |  |  |  | 5.50% |  |
J&J Worldwide Services |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity interest percentage | 100.00% |  |  |  |  |  |  |
Deferred consideration, gross | $ 7,400,000 |  |  |  |  |  |  |
Earnout payment | 250,000,000.0 |  |  |  |  |  |  |
Goodwill deductible amount |  | $ 115,000,000 |  |  |  | $ 115,000,000 |  |
Revenue |  | 105,700,000 |  |  |  | 147,100,000 |  |
Operating income (loss) |  | (4,800,000) |  |  |  | (5,100,000) |  |
Operational net income |  | (4,400,000) |  |  |  | (3,900,000) |  |
Integration and other costs related to acquisitions |  | $ 1,000,000 | $ 17,500,000 | $ 2,100,000 |  |  |  |
Increased amortization expense |  |  |  |  | 4,700,000 | 3,200,000 | 9,400,000 |
Increased depreciation expense |  |  |  |  | $ 7,000,000 | 4,200,000 | $ 14,100,000 |
Payments to acquire business | 809,000,000 |  |  |  |  |  |  |
J&J Worldwide Services | 5.500% Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount | $ 500,000,000 |  |  |  |  |  |  |
Interest rate | 5.50% |  |  |  |  |  |  |
Other Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payments to acquire business |  |  |  |  |  | $ 290,900,000 |  |

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