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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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