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Segments - Summarized Financial Information by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 674.0	$ 622.0	$ 613.0
Equity (loss) income from unconsolidated subsidiaries	(19.0)	248.0	229.0
Amortization of right-to-use assets	41.0	36.0
Operating Segments
Segment Reporting Information [Line Items]
Equity (loss) income from unconsolidated subsidiaries	(19.0)	248.0	229.0
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization	57.0	56.0	33.0
Equity (loss) income from unconsolidated subsidiaries	(134.0)	27.0	(167.0)
Advisory Services | Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	272.0	289.0	311.0
Equity (loss) income from unconsolidated subsidiaries	1.0	4.0	15.0
Global Workplace Solutions | Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	332.0	262.0	253.0
Equity (loss) income from unconsolidated subsidiaries	(3.0)	1.0	1.0
Amortization of right-to-use assets	41.0	46.0	53.0
Real Estate Investments | Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	13.0	15.0	16.0
Equity (loss) income from unconsolidated subsidiaries	$ 117.0	$ 216.0	$ 380.0

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