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Business Combinations, Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]    
Finite-Lived Intangible Assets, Net $ 625.8  
Indefinite-lived Intangible Assets (Excluding Goodwill) 54.0  
Goodwill [Roll Forward]    
Goodwill 4,168.2 $ 2,697.8
Additions, net of adjustments   1,461.5
Goodwill, Written off Related to Sale of Business Unit (0.7) (4.4)
Impact of exchange rate movements 57.2 13.3
Goodwill 4,224.7 4,168.2
LaSalle [Member]    
Goodwill [Roll Forward]    
Goodwill 57.1 22.2
Additions, net of adjustments   35.5
Goodwill, Written off Related to Sale of Business Unit 0.0 0.0
Impact of exchange rate movements 0.7 (0.6)
Goodwill 57.8 57.1
Americas [Member]    
Goodwill [Roll Forward]    
Goodwill 2,877.6 1,452.0
Additions, net of adjustments   1,424.4
Goodwill, Written off Related to Sale of Business Unit 0.0 0.0
Impact of exchange rate movements 0.4 1.2
Goodwill 2,878.0 2,877.6
EMEA [Member]    
Goodwill [Roll Forward]    
Goodwill 915.9 906.8
Additions, net of adjustments   1.6
Goodwill, Written off Related to Sale of Business Unit (0.7) (4.4)
Impact of exchange rate movements 44.5 11.9
Goodwill 959.7 915.9
Asia Pacific [Member]    
Goodwill [Roll Forward]    
Goodwill 317.6 316.8
Additions, net of adjustments   0.0
Goodwill, Written off Related to Sale of Business Unit 0.0 0.0
Impact of exchange rate movements 11.6 0.8
Goodwill $ 329.2 $ 317.6