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Acquisitions - Narrative (Details)		12 Months Ended
	Feb. 27, 2024 USD ($)	Dec. 31, 2024 USD ($) acquisition segment	Dec. 31, 2023 USD ($) segment acquisition	Feb. 23, 2024 USD ($)
Business Acquisition [Line Items]
Number of businesses acquired | acquisition		9	16
5.500% senior notes | Senior Notes
Business Acquisition [Line Items]
Aggregate principal amount				$ 500,000,000
Interest rate		5.50%		5.50%
Raleigh Joint Venture
Business Acquisition [Line Items]
Equity interest percentage			50.00%
Cash and deferred consideration		$ 315,000,000	$ 312,000,000
J&J Worldwide Services
Business Acquisition [Line Items]
Equity interest percentage	100.00%
Deferred consideration, gross	$ 7,000,000
Earnout payment	250,000,000
Goodwill deductible amount		115,000,000
Increased amortization expense		3,000,000	19,000,000
Increased depreciation expense		4,000,000	28,000,000
Integration and other costs related to acquisitions		$ 25,000,000	$ 25,000,000
Cash and deferred consideration	808,000,000
J&J Worldwide Services | 5.500% senior notes | Senior Notes
Business Acquisition [Line Items]
Aggregate principal amount	$ 500,000,000
Interest rate	5.50%
Advisory Services
Business Acquisition [Line Items]
Number of businesses acquired | segment		3	9
Global Workplace Solutions
Business Acquisition [Line Items]
Number of businesses acquired | segment		6	6
Real Estate Investments
Business Acquisition [Line Items]
Number of businesses acquired | segment			1

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