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Goodwill and Other Intangible Assets - Schedule of Changes in Goodwill by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Goodwill [Roll Forward]          
goodwill, gross, beginning balance     $ 6,088,681 $ 4,915,115  
Accumulated impairment losses $ (1,119,911)   (1,119,911) (1,093,506) $ (1,093,506)
Goodwill, beginning balance     4,995,175 3,821,609  
Reallocation       0  
Purchase accounting entries related to acquisitions     80,352 1,245,294  
Goodwill impairment (21,900)   (26,405) 0  
Foreign exchange movement     (180,740) (71,728)  
Goodwill, gross, ending balance 5,988,293   5,988,293 6,088,681 4,915,115
Goodwill, ending balance 4,868,382   4,868,382 4,995,175 3,821,609
Advisory Services          
Goodwill [Roll Forward]          
goodwill, gross, beginning balance     3,298,494 3,348,788  
Accumulated impairment losses (761,448)   (761,448) (761,448) (761,448)
Goodwill, beginning balance     2,537,046 2,587,340  
Reallocation       (101,390)  
Purchase accounting entries related to acquisitions     19,909 77,616  
Goodwill impairment     0 0  
Foreign exchange movement     (35,973) (26,520)  
Goodwill, gross, ending balance 3,282,430   3,282,430 3,298,494 3,348,788
Goodwill, ending balance 2,520,982   2,520,982 2,537,046 2,587,340
Global Workplace Solutions          
Goodwill [Roll Forward]          
goodwill, gross, beginning balance     2,174,029 937,797  
Accumulated impairment losses (175,473)   (175,473) (175,473) (175,473)
Goodwill, beginning balance     1,998,556 762,324  
Reallocation       101,390  
Purchase accounting entries related to acquisitions     60,443 1,167,678  
Goodwill impairment     0 0 (25,000)
Foreign exchange movement     (123,837) (32,836)  
Goodwill, gross, ending balance 2,110,635   2,110,635 2,174,029 937,797
Goodwill, ending balance 1,935,162   1,935,162 1,998,556 762,324
Real Estate Investments          
Goodwill [Roll Forward]          
goodwill, gross, beginning balance     616,158 628,530  
Accumulated impairment losses (182,990)   (182,990) (156,585) (156,585)
Goodwill, beginning balance     459,573 471,945  
Reallocation       0  
Purchase accounting entries related to acquisitions     0 0  
Goodwill impairment (21,900) $ (26,400) (26,405) 0  
Foreign exchange movement     (20,930) (12,372)  
Goodwill, gross, ending balance 595,228   595,228 616,158 628,530
Goodwill, ending balance $ 412,238   $ 412,238 $ 459,573 $ 471,945