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Business Combinations, Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]    
Finite-Lived Intangible Assets, Net $ 632.6  
Indefinite-lived Intangible Assets (Excluding Goodwill) 50.0  
Goodwill [Roll Forward]    
Goodwill 2,697.8 $ 2,709.3
Additions, net of adjustments 1,461.5 59.0
Goodwill, Written off Related to Sale of Business Unit (4.4) (3.9)
Impact of exchange rate movements 13.3 (66.6)
Goodwill 4,168.2 2,697.8
Asia Pacific [Member]    
Goodwill [Roll Forward]    
Goodwill, Written off Related to Sale of Business Unit 0.0 (3.9)
EMEA [Member]    
Goodwill [Roll Forward]    
Goodwill, Written off Related to Sale of Business Unit (4.4) 0.0
LaSalle [Member]    
Goodwill [Roll Forward]    
Goodwill 22.2 16.5
Additions, net of adjustments 35.5 6.4
Goodwill, Written off Related to Sale of Business Unit 0.0 0.0
Impact of exchange rate movements (0.6) (0.7)
Goodwill 57.1 22.2
Americas [Member]    
Goodwill [Roll Forward]    
Goodwill, Written off Related to Sale of Business Unit 0.0 0.0
Americas [Member] | Reportable Subsegments [Member]    
Goodwill [Roll Forward]    
Goodwill 1,452.0 1,412.2
Additions, net of adjustments 1,424.4 42.0
Impact of exchange rate movements 1.2 (2.2)
Goodwill 2,877.6 1,452.0
EMEA [Member] | Reportable Subsegments [Member]    
Goodwill [Roll Forward]    
Goodwill 906.8 957.6
Additions, net of adjustments 1.6 1.9
Impact of exchange rate movements 11.9 (52.7)
Goodwill 915.9 906.8
Asia Pacific [Member] | Reportable Subsegments [Member]    
Goodwill [Roll Forward]    
Goodwill 316.8 323.0
Additions, net of adjustments 0.0 8.7
Impact of exchange rate movements 0.8 (11.0)
Goodwill $ 317.6 $ 316.8