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Business Combinations (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 86.0      
Business Combinations, Guaranteed Deferred Acquisition Obligation 0.0 $ 6.5    
Business Combination, contingent earn-out consideration 0.0 1.5    
Redeemable Noncontrolling Interest $ 8.6   $ 8.6  
Document Period End Date Mar. 31, 2020      
Payment for Contingent Consideration Liability, Total $ 12.9      
Goodwill 4,104.3 2,738.3 4,168.2 $ 2,697.8
Reportable Subsegments [Member] | Americas [Member]        
Business Acquisition [Line Items]        
Goodwill 2,874.7 1,455.6 2,877.6 1,452.0
Reportable Subsegments [Member] | EMEA [Member]        
Business Acquisition [Line Items]        
Goodwill 869.3 910.7 915.9 906.8
Reportable Subsegments [Member] | Asia Pacific [Member]        
Business Acquisition [Line Items]        
Goodwill 304.2 317.5 317.6 316.8
Investment Management [Member]        
Business Acquisition [Line Items]        
Goodwill 56.1 54.5 $ 57.1 $ 22.2
HFF Acquisition [Member]        
Business Acquisition [Line Items]        
Business Combination, Integration Related Costs $ 21.3 $ 6.5