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Business Combinations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			$ 22.2	$ 0.0
Cash Acquired from Acquisition			6.7
Business Combination, contingent earn-out consideration			31.3	0.0
Goodwill, Acquired During Period			35.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			19.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 1.3		$ 1.3
Document Period End Date			Sep. 30, 2021
Payment for Contingent Consideration Liability, Total			$ 82.5
Goodwill	4,212.1	$ 4,164.0	4,212.1	4,164.0	$ 4,224.7	$ 4,168.2
Americas [Member]
Business Acquisition [Line Items]
Goodwill	2,902.4	2,876.5	2,902.4	2,876.5	2,878.0	2,877.6
EMEA [Member]
Business Acquisition [Line Items]
Goodwill	932.2	910.5	932.2	910.5	959.7	915.9
Asia Pacific [Member]
Business Acquisition [Line Items]
Goodwill	320.1	320.2	320.1	320.2	329.2	317.6
Investment Management [Member]
Business Acquisition [Line Items]
Goodwill	57.4	56.8	57.4	56.8	$ 57.8	$ 57.1
HFF Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs	$ 6.6	$ 13.8	$ 30.5	$ 55.2

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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