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Business Combinations, Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Finite-Lived Intangible Assets, Net	$ 836.4
Indefinite-lived Intangible Assets (Excluding Goodwill)	50.6
Goodwill [Roll Forward]
Goodwill	4,224.7	$ 4,168.2
Additions, net of adjustments	442.3
Goodwill, Written off Related to Sale of Business Unit	(12.0)	(0.7)
Impact of exchange rate movements	(43.4)	57.2
Goodwill	4,611.6	4,224.7
LaSalle [Member]
Goodwill [Roll Forward]
Goodwill	57.8	57.1
Additions, net of adjustments	0.0
Goodwill, Written off Related to Sale of Business Unit	0.0	0.0
Impact of exchange rate movements	(0.4)	0.7
Goodwill	57.4	57.8
Americas [Member]
Goodwill [Roll Forward]
Goodwill	2,878.0	2,877.6
Additions, net of adjustments	442.3
Goodwill, Written off Related to Sale of Business Unit	(11.0)	0.0
Impact of exchange rate movements	0.0	0.4
Goodwill	3,309.3	2,878.0
EMEA [Member]
Goodwill [Roll Forward]
Goodwill	959.7	915.9
Additions, net of adjustments	0.0
Goodwill, Written off Related to Sale of Business Unit	(1.0)	(0.7)
Impact of exchange rate movements	(34.3)	44.5
Goodwill	924.4	959.7
Asia Pacific [Member]
Goodwill [Roll Forward]
Goodwill	329.2	317.6
Additions, net of adjustments	0.0
Goodwill, Written off Related to Sale of Business Unit	0.0	0.0
Impact of exchange rate movements	(8.7)	11.6
Goodwill	$ 320.5	$ 329.2

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 amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB
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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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