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Business Combinations, Goodwill by Segment (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		$ 18.7	$ 13.5
Goodwill, Written off Related to Sale of Business Unit		(0.6)
Goodwill, Translation Adjustments		(4.3)	(170.3)
Goodwill	$ 4,454.8	4,541.8	4,454.8
Goodwill		4,528.0	4,611.6
Markets Advisory
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		0.0	0.0
Goodwill, Written off Related to Sale of Business Unit		(0.4)
Goodwill, Translation Adjustments	(69.8)	(1.7)
Goodwill	1,713.1	1,740.8	1,713.1
Goodwill		1,742.9	1,782.9
Capital Markets
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		18.7	8.5
Goodwill, Written off Related to Sale of Business Unit		(0.2)
Goodwill, Translation Adjustments		(2.0)	(76.4)
Goodwill	1,916.0	1,965.7	1,916.0
Goodwill		1,949.2	1,983.9
Work Dynamics
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		0.0	4.6
Goodwill, Written off Related to Sale of Business Unit		0.0
Goodwill, Translation Adjustments		(0.5)	(20.8)
Goodwill	523.7	532.1	523.7
Goodwill		532.6	539.9
JLL Technologies
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		0.0	0.4
Goodwill, Written off Related to Sale of Business Unit		0.0
Goodwill, Translation Adjustments		(0.1)	(0.2)
Goodwill	247.7	247.6	247.7
Goodwill		247.7	247.5
Investment Management [Member]
Goodwill [Roll Forward]
Goodwill, Written off Related to Sale of Business Unit		0.0
LaSalle Investment Management
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		0.0	0.0
Goodwill, Translation Adjustments		0.0	(3.1)
Goodwill	$ 54.3	55.6	54.3
Goodwill		$ 55.6	$ 57.4

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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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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