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Business Combinations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 63.4
Business Combination, contingent earn-out consideration	3.8	$ 0.0
Redeemable Noncontrolling Interest	$ 7.8		$ 7.8
Document Period End Date	Mar. 31, 2021
Payment for Contingent Consideration Liability, Total	$ 26.2
Goodwill	4,201.7	4,104.3	4,224.7	$ 4,168.2
Americas [Member]
Business Acquisition [Line Items]
Goodwill	2,867.3	2,874.7	2,878.0	2,877.6
EMEA [Member]
Business Acquisition [Line Items]
Goodwill	950.4	869.3	959.7	915.9
Asia Pacific [Member]
Business Acquisition [Line Items]
Goodwill	326.2	304.2	329.2	317.6
Investment Management [Member]
Business Acquisition [Line Items]
Goodwill	57.8	56.1	$ 57.8	$ 57.1
HFF Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs	$ 11.5	$ 21.3

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