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Business Combinations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 81.2		$ 81.2
Business Combinations, Guaranteed Deferred Acquisition Obligation			0.0	$ 6.5
Business Combination, contingent earn-out consideration			0.0	1.5
Redeemable Noncontrolling Interest	8.1		$ 8.1		$ 8.6
Document Period End Date			Jun. 30, 2020
Payment for Contingent Consideration Liability, Total			$ 47.7
Goodwill	4,120.9	$ 2,730.7	4,120.9	2,730.7	4,168.2	$ 2,697.8
Reportable Subsegments [Member] | Americas [Member]
Business Acquisition [Line Items]
Goodwill	2,875.9	1,456.4	2,875.9	1,456.4	2,877.6	1,452.0
Reportable Subsegments [Member] | EMEA [Member]
Business Acquisition [Line Items]
Goodwill	873.8	900.4	873.8	900.4	915.9	906.8
Reportable Subsegments [Member] | Asia Pacific [Member]
Business Acquisition [Line Items]
Goodwill	315.1	317.3	315.1	317.3	317.6	316.8
Investment Management [Member]
Business Acquisition [Line Items]
Goodwill	56.1	56.6	56.1	56.6	$ 57.1	$ 22.2
HFF Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs	$ 20.1	$ 3.2	$ 41.4	$ 9.7

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