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Business Combinations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 85.9		$ 85.9
Business Combinations, Guaranteed Deferred Acquisition Obligation			0.0	$ 6.5
Business Combination, contingent earn-out consideration			0.0	842.7
Redeemable Noncontrolling Interest	7.9		$ 7.9		$ 8.6
Document Period End Date			Sep. 30, 2020
Payment for Contingent Consideration Liability, Total			$ 58.5
Goodwill	4,164.0	$ 4,083.2	4,164.0	4,083.2	4,168.2	$ 2,697.8
Reportable Subsegments [Member] | Americas [Member]
Business Acquisition [Line Items]
Goodwill	2,876.5	2,845.2	2,876.5	2,845.2	2,877.6	1,452.0
Reportable Subsegments [Member] | EMEA [Member]
Business Acquisition [Line Items]
Goodwill	910.5	869.9	910.5	869.9	915.9	906.8
Reportable Subsegments [Member] | Asia Pacific [Member]
Business Acquisition [Line Items]
Goodwill	320.2	312.2	320.2	312.2	317.6	316.8
Investment Management [Member]
Business Acquisition [Line Items]
Goodwill	56.8	55.9	56.8	55.9	$ 57.1	$ 22.2
HFF Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs	$ 13.8	$ 60.1	$ 55.2	$ 69.8

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