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Business Combinations, Goodwill by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Goodwill [Roll Forward]
Goodwill	$ 4,587.4	$ 4,528.0
Goodwill Additions, net of adjustments	0.0	0.0
Goodwill, Translation Adjustments	(18.3)	15.9
Goodwill	4,569.1	4,543.9
Markets Advisory
Goodwill [Roll Forward]
Goodwill	1,759.3	1,742.9
Goodwill Additions, net of adjustments	0.0	0.0
Goodwill, Translation Adjustments	(7.5)	6.5
Goodwill	1,751.8	1,749.4
Capital Markets
Goodwill [Roll Forward]
Goodwill	1,986.4	1,949.2
Goodwill Additions, net of adjustments	0.0	0.0
Goodwill, Translation Adjustments	(8.3)	7.2
Goodwill	1,978.1	1,956.4
Work Dynamics
Goodwill [Roll Forward]
Goodwill	537.7	532.6
Goodwill Additions, net of adjustments	0.0	0.0
Goodwill, Translation Adjustments	(2.3)	1.9
Goodwill	535.4	534.5
JLL Technologies
Goodwill [Roll Forward]
Goodwill	247.7	247.7
Goodwill Additions, net of adjustments	0.0	0.0
Goodwill, Translation Adjustments	0.0	0.0
Goodwill	247.7	247.7
LaSalle Investment Management
Goodwill [Roll Forward]
Goodwill	56.3	55.6
Goodwill Additions, net of adjustments	0.0	0.0
Goodwill, Translation Adjustments	(0.2)	0.3
Goodwill	$ 56.1	$ 55.9

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.

+ References

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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.

+ References

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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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