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Business Combinations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 64.9		$ 64.9
Business Combination, contingent earn-out consideration			3.8	$ 0.0
Redeemable Noncontrolling Interest	7.5		$ 7.5		$ 7.8
Document Period End Date			Jun. 30, 2021
Payment for Contingent Consideration Liability, Total			$ 78.4
Goodwill	4,205.1	$ 4,120.9	4,205.1	4,120.9	4,224.7	$ 4,168.2
Americas [Member]
Business Acquisition [Line Items]
Goodwill	2,868.0	2,875.9	2,868.0	2,875.9	2,878.0	2,877.6
EMEA [Member]
Business Acquisition [Line Items]
Goodwill	954.5	873.8	954.5	873.8	959.7	915.9
Asia Pacific [Member]
Business Acquisition [Line Items]
Goodwill	324.8	315.1	324.8	315.1	329.2	317.6
Investment Management [Member]
Business Acquisition [Line Items]
Goodwill	57.8	56.1	57.8	56.1	$ 57.8	$ 57.1
HFF Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs	$ 12.4	$ 20.1	$ 23.9	$ 41.4

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