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Goodwill and Other Intangible Assets - Schedule of Changes in Goodwill by Segment (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]        
goodwill, gross, beginning balance $ 4,821,999,000 $ 4,821,999,000 $ 4,720,815,000  
Accumulated impairment losses   (1,093,506,000) (1,068,506,000) $ (1,068,506,000)
Goodwill, beginning balance 3,753,493,000 3,753,493,000 3,652,309,000  
Purchase accounting entries related to acquisitions   18,181,000 79,377,000  
Goodwill impairment (25,000,000.0) (25,000,000) 0  
Foreign exchange movement   74,935,000 21,807,000  
Goodwill, gross, ending balance   4,915,115,000 4,821,999,000  
Goodwill, ending balance   3,821,609,000 3,753,493,000  
Advisory Services        
Goodwill [Roll Forward]        
goodwill, gross, beginning balance 3,302,218,000 3,302,218,000 3,269,954,000  
Accumulated impairment losses   (761,448,000) (761,448,000) (761,448,000)
Goodwill, beginning balance 2,540,770,000 2,540,770,000 2,508,506,000  
Purchase accounting entries related to acquisitions   16,463,000 29,544,000  
Goodwill impairment   0    
Foreign exchange movement   30,107,000 2,720,000  
Goodwill, gross, ending balance   3,348,788,000 3,302,218,000  
Goodwill, ending balance   2,587,340,000 2,540,770,000  
Global Workplace Solutions        
Goodwill [Roll Forward]        
goodwill, gross, beginning balance 899,506,000 899,506,000 875,570,000  
Accumulated impairment losses   (175,473,000) (175,473,000) (175,473,000)
Goodwill, beginning balance 724,033,000 724,033,000 700,097,000  
Purchase accounting entries related to acquisitions   9,702,000 7,657,000  
Goodwill impairment   0    
Foreign exchange movement   28,589,000 16,279,000  
Goodwill, gross, ending balance   937,797,000 899,506,000  
Goodwill, ending balance   762,324,000 724,033,000  
Real Estate Investments        
Goodwill [Roll Forward]        
goodwill, gross, beginning balance 620,275,000 620,275,000 575,291,000  
Accumulated impairment losses   (156,585,000) (131,585,000) $ (131,585,000)
Goodwill, beginning balance $ 488,690,000 488,690,000 443,706,000  
Purchase accounting entries related to acquisitions   (7,984,000) 42,176,000  
Goodwill impairment   (25,000,000)    
Foreign exchange movement   16,239,000 2,808,000  
Goodwill, gross, ending balance   628,530,000 620,275,000  
Goodwill, ending balance   $ 471,945,000 $ 488,690,000