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Business Combinations, Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]    
Finite-Lived Intangible Assets, Net $ 286.2  
Indefinite-Lived Intangible Assets (Excluding Goodwill) 8.8  
Goodwill [Roll Forward]    
Goodwill 2,141.5 $ 1,907.9
Additions, net of adjustments 539.8 288.3
Impact of exchange rate movements (102.0) (54.7)
Goodwill 2,579.3 2,141.5
LaSalle [Member]    
Goodwill [Roll Forward]    
Goodwill 17.6 18.4
Additions, net of adjustments 0.0 0.0
Impact of exchange rate movements (2.2) (0.8)
Goodwill 15.4 17.6
Americas [Member] | Reportable Subsegments [Member]    
Goodwill [Roll Forward]    
Goodwill 1,161.1 1,008.3
Additions, net of adjustments 244.3 153.7
Impact of exchange rate movements 0.7 (0.9)
Goodwill 1,406.1 1,161.1
EMEA [Member] | Reportable Subsegments [Member]    
Goodwill [Roll Forward]    
Goodwill 696.2 650.4
Additions, net of adjustments 253.8 92.7
Impact of exchange rate movements (98.3) (46.9)
Goodwill 851.7 696.2
Asia Pacific [Member] | Reportable Subsegments [Member]    
Goodwill [Roll Forward]    
Goodwill 266.6 230.8
Additions, net of adjustments 41.7 41.9
Impact of exchange rate movements (2.2) (6.1)
Goodwill $ 306.1 $ 266.6