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Business Combinations, Goodwill by Segment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Goodwill [Line Items]      
Intangible Assets, Net (Including Goodwill) $ 2,932.5    
Goodwill 308.2 $ 234.4 $ 295.0
Finite-Lived Intangible Assets, Net 299.4    
Identifiable intangibles with indefinite useful lives 8.8    
Goodwill [Roll Forward]      
Goodwill 2,579.3 2,141.5  
Goodwill Additions, net of adjustments 26.0 118.6  
Goodwill, Translation Adjustments 19.0 4.2  
Goodwill 2,624.3 2,264.3  
Investment Management [Member]      
Goodwill [Roll Forward]      
Goodwill 15.4 17.6  
Goodwill Additions, net of adjustments 0.0 0.0  
Goodwill, Translation Adjustments 0.2 (0.3)  
Goodwill 15.6 17.3  
Americas [Member] | Reportable Subsegments [Member]      
Goodwill [Roll Forward]      
Goodwill 1,406.1 1,161.1  
Goodwill Additions, net of adjustments 2.8 87.4  
Goodwill, Translation Adjustments 0.1 0.8  
Goodwill 1,409.0 1,249.3  
EMEA [Member] | Reportable Subsegments [Member]      
Goodwill [Roll Forward]      
Goodwill 851.7 696.2  
Goodwill Additions, net of adjustments 17.7 26.9  
Goodwill, Translation Adjustments 12.2 (2.2)  
Goodwill 881.6 720.9  
Asia Pacific [Member] | Reportable Subsegments [Member]      
Goodwill [Roll Forward]      
Goodwill 306.1 266.6  
Goodwill Additions, net of adjustments 5.5 4.3  
Goodwill, Translation Adjustments 6.5 5.9  
Goodwill $ 318.1 $ 276.8