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Goodwill and Other Intangible Assets - Narrative (Details) |  | 3 Months Ended | 12 Months Ended | 19 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2019 segment | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) acquisition | Dec. 31, 2019 USD ($) acquisition | Dec. 31, 2018 USD ($) acquisition | Dec. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Global business segments | segment | 3 |  |  |  |  |
Goodwill impairment |  | $ 25,000,000.0 | $ 25,000,000 | $ 0 |  |
Number of in-fill acquisitions completed | acquisition |  |  | 6 | 8 | 6 |
Equity interest acquired |  |  |  |  | 50.00% |
Other intangible assets |  |  | $ 1,367,913,000 | $ 1,379,546,000 |  | $ 1,379,546,000
Other intangible assets, accumulated amortization |  |  | 1,556,537,000 | 1,358,528,000 |  | 1,358,528,000
Intangible assets |  |  | 2,800,228,000 | 2,612,936,000 |  | 2,612,936,000
Amortization expense |  |  | 227,100,000 | 225,700,000 | $ 258,700,000 |
Estimated annual amortization expense, 2021 |  |  | 202,400,000 |  |  |
Estimated annual amortization expense, 2022 |  |  | 180,100,000 |  |  |
Estimated annual amortization expense, 2023 |  |  | 156,200,000 |  |  |
Estimated annual amortization expense, 2024 |  |  | 134,200,000 |  |  |
Estimated annual amortization expense, 2025 |  |  | 115,600,000 |  |  |
Global Workplace Solutions |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  | 0 |  |  |
Real Estate Investments |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  | 25,000,000 |  |  |
Intangible asset impairment |  |  | 6,000,000.0 | 89,800,000 |  |
Customer relationships |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Other intangible assets, accumulated amortization |  |  | $ 603,866,000 | 519,162,000 |  | 519,162,000
Intangible assets, amortization period |  |  | 20 years |  |  |
Intangible assets |  |  | $ 880,104,000 | 857,772,000 |  | 857,772,000
Mortgage servicing rights |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Other intangible assets, accumulated amortization |  |  | $ 370,634,000 | 319,927,000 |  | 319,927,000
Intangible assets, amortization period |  |  | 10 years |  |  |
Intangible assets |  |  | $ 927,525,000 | 803,419,000 |  | 803,419,000
Management contracts |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Other intangible assets, accumulated amortization |  |  | $ 145,612,000 | 138,891,000 |  | 138,891,000
Intangible assets, amortization period |  |  | 13 years |  |  |
Intangible assets |  |  | $ 152,312,000 | 142,767,000 |  | 142,767,000
Amortizable trade name and customer relationships | Global Workplace Solutions |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible asset impairment |  |  | $ 28,500,000 |  |  |
FacilitySource |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Final net purchase price |  |  |  |  |  | $ 266,500,000
Cash paid to acquire business |  |  |  | $ 3,500,000 | $ 263,000,000.0 |
New England Joint Venture |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Equity interest acquired |  |  |  |  | 50.00% |
Telford Homes | Trademark |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, amortization period |  |  | 20 years |  |  |
Intangible assets |  |  | $ 26,700,000 |  |  |
Global Workplace Solutions | Trademark |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, amortization period |  |  | 20 years |  |  |
Intangible assets |  |  | $ 280,000,000 |  |  |

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