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Business Combinations, Goodwill by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments	$ 0.0	$ 5.8
Goodwill, Translation Adjustments	15.9	(19.5)
Goodwill	4,543.9	4,597.9
Goodwill	4,528.0	4,611.6
Markets Advisory
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments	0.0	0.0
Goodwill, Translation Adjustments	6.5	(7.9)
Goodwill	1,749.4	1,775.0
Goodwill	1,742.9	1,782.9
Capital Markets
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments	0.0	0.8
Goodwill, Translation Adjustments	7.2	(8.8)
Goodwill	1,956.4	1,975.9
Goodwill	1,949.2	1,983.9
Work Dynamics
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments	0.0	4.6
Goodwill, Translation Adjustments	1.9	(2.4)
Goodwill	534.5	542.1
Goodwill	532.6	539.9
JLL Technologies
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments	0.0	0.4
Goodwill, Translation Adjustments	0.0	0.0
Goodwill	247.7	247.9
Goodwill	247.7	247.5
LaSalle Investment Management
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments	0.0	0.0
Goodwill, Translation Adjustments	0.3	(0.4)
Goodwill	55.9	57.0
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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

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