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Business Combinations, Goodwill by Segment (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Goodwill [Roll Forward]
Goodwill	$ 4,587.4	$ 4,528.0
Goodwill Additions, net of adjustments	43.8	18.7
Goodwill, Written off Related to Sale of Business Unit		(0.6)
Goodwill, Translation Adjustments	36.0	(4.3)
Goodwill	4,667.2	4,541.8
Markets Advisory
Goodwill [Roll Forward]
Goodwill	1,759.3	1,742.9
Goodwill Additions, net of adjustments	0.0	0.0
Goodwill, Written off Related to Sale of Business Unit		(0.4)
Goodwill, Translation Adjustments	14.5	(1.7)
Goodwill	1,773.8	1,740.8
Capital Markets
Goodwill [Roll Forward]
Goodwill	1,986.4	1,949.2
Goodwill Additions, net of adjustments	3.4	18.7
Goodwill, Written off Related to Sale of Business Unit		(0.2)
Goodwill, Translation Adjustments	16.3	(2.0)
Goodwill	2,006.1	1,965.7
Work Dynamics
Goodwill [Roll Forward]
Goodwill	537.7	532.6
Goodwill Additions, net of adjustments	40.4	0.0
Goodwill, Written off Related to Sale of Business Unit		0.0
Goodwill, Translation Adjustments	4.4	(0.5)
Goodwill	582.5	532.1
JLL Technologies
Goodwill [Roll Forward]
Goodwill	247.7	247.7
Goodwill Additions, net of adjustments	0.0	0.0
Goodwill, Written off Related to Sale of Business Unit		0.0
Goodwill, Translation Adjustments	0.0	(0.1)
Goodwill	247.7	247.6
LaSalle Investment Management
Goodwill [Roll Forward]
Goodwill	56.3	55.6
Goodwill Additions, net of adjustments	0.0	0.0
Goodwill, Written off Related to Sale of Business Unit		0.0
Goodwill, Translation Adjustments	0.8	0.0
Goodwill	$ 57.1	$ 55.6

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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Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of divestiture 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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