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Business Combinations, Goodwill by Segment (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Goodwill [Roll Forward]
Goodwill	$ 4,611.3
Goodwill Additions, net of adjustments	6.6
Goodwill, Translation Adjustments	87.6
Goodwill	4,705.5
Leasing Advisory
Goodwill [Roll Forward]
Goodwill	1,372.6
Goodwill Additions, net of adjustments	0.0
Goodwill, Translation Adjustments	32.6
Goodwill	1,405.2
Capital Markets Services
Goodwill [Roll Forward]
Goodwill	1,971.5
Goodwill Additions, net of adjustments	6.6
Goodwill, Translation Adjustments	39.9
Goodwill	2,018.0
Real Estate Management Services
Goodwill [Roll Forward]
Goodwill	961.2
Goodwill Additions, net of adjustments	0.0
Goodwill, Translation Adjustments	13.9
Goodwill	975.1
Software and Technology Solutions
Goodwill [Roll Forward]
Goodwill	250.1
Goodwill Additions, net of adjustments	0.0
Goodwill, Translation Adjustments	(0.1)
Goodwill	250.0
Investment Management
Goodwill [Roll Forward]
Goodwill	55.9
Goodwill Additions, net of adjustments	0.0
Goodwill, Translation Adjustments	1.3
Goodwill	$ 57.2

X

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. Also includes purchase price allocation adjustment for allocations not yet complete at the prior year end.

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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