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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 |

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