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Business Combinations, Goodwill by Segment (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		$ 18.7	$ 5.8
Goodwill, Translation Adjustments		31.0	(97.5)
Goodwill	$ 4,519.9	4,577.7	4,519.9
Goodwill		4,528.0	4,611.6
Markets Advisory
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		0.0	0.0
Goodwill, Translation Adjustments	(40.2)	12.5
Goodwill	1,742.7	1,755.4	1,742.7
Goodwill		1,742.9	1,782.9
Capital Markets
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		18.7	0.8
Goodwill, Translation Adjustments		14.1	(43.5)
Goodwill	1,941.2	1,982.0	1,941.2
Goodwill		1,949.2	1,983.9
Work Dynamics
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		0.0	4.6
Goodwill, Translation Adjustments		3.8	(11.8)
Goodwill	532.7	536.4	532.7
Goodwill		532.6	539.9
JLL Technologies
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		0.0	0.4
Goodwill, Translation Adjustments		0.0	(0.2)
Goodwill	247.7	247.7	247.7
Goodwill		247.7	247.5
LaSalle Investment Management
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		0.0	0.0
Goodwill, Translation Adjustments		0.6	(1.8)
Goodwill	$ 55.6	56.2	55.6
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.

+ 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.

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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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