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Business Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Operating Income (Loss) | $ 1,043.5 | $ 559.1 | $ 715.4
Restructuring and acquisition charges | (84.7) | (142.4) | (184.4)
Depreciation and amortization | 217.5 | 226.4 | 202.4
Equity in earnings (losses) | (209.4) | (8.0) | (36.3)
Segment revenue: |  |  |
Revenues | 19,367.0 | 16,589.9 | 17,983.2
Revenue Before Reimbursements | 11,045.6 | 8,900.1 | 10,030.6
Americas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 138.5 | 151.4 | 126.5
Equity in earnings (losses) | (142.2) | (19.0) | (1.7)
Operating Income (Loss), Including Income (Loss) from Equity Method Investments | 1,073.8 | 554.9 | 613.1
Segment revenue: |  |  |
Revenues | 11,887.1 | 10,005.2 | 10,578.9
EMEA [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 42.2 | 40.0 | 43.1
Equity in earnings (losses) | 0.0 | 0.0 | 1.0
Operating Income (Loss), Including Income (Loss) from Equity Method Investments | (5.6) | (16.0) | 46.0
Segment revenue: |  |  |
Revenues | 3,477.7 | 3,092.8 | 3,470.7
Asia Pacific [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 30.2 | 27.8 | 26.4
Equity in earnings (losses) | (4.6) | (1.4) | (2.3)
Operating Income (Loss), Including Income (Loss) from Equity Method Investments | 130.2 | 116.4 | 129.6
Segment revenue: |  |  |
Revenues | 3,502.1 | 3,070.1 | 3,407.5
LaSalle Investment Management [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 6.6 | 7.2 | 6.4
Equity in earnings (losses) | (62.6) | 12.4 | (33.3)
Operating Income (Loss), Including Income (Loss) from Equity Method Investments | 139.2 | 54.2 | 147.4
Segment revenue: |  |  |
Revenues | 500.1 | 421.8 | 526.1
Leasing [Member] | Americas [Member] |  |  |
Segment revenue: |  |  |
Revenues | 2,179.1 | 1,451.2 | 1,960.5
Leasing [Member] | EMEA [Member] |  |  |
Segment revenue: |  |  |
Revenues | 347.3 | 245.6 | 302.7
Leasing [Member] | Asia Pacific [Member] |  |  |
Segment revenue: |  |  |
Revenues | 267.6 | 187.4 | 260.8
Capital Markets [Member] | Americas [Member] |  |  |
Segment revenue: |  |  |
Revenues | 1,525.9 | 952.0 | 914.2
Capital Markets [Member] | EMEA [Member] |  |  |
Segment revenue: |  |  |
Revenues | 473.4 | 330.7 | 411.9
Capital Markets [Member] | Asia Pacific [Member] |  |  |
Segment revenue: |  |  |
Revenues | 194.2 | 124.7 | 216.1
Property & Facility Management [Member] | Americas [Member] |  |  |
Segment revenue: |  |  |
Revenues | 6,375.3 | 5,878.2 | 5,607.9
Property & Facility Management [Member] | EMEA [Member] |  |  |
Segment revenue: |  |  |
Revenues | 1,504.7 | 1,456.6 | 1,551.6
Property & Facility Management [Member] | Asia Pacific [Member] |  |  |
Segment revenue: |  |  |
Revenues | 2,342.7 | 2,150.6 | 2,205.2
Project & Development Services [Member] | Americas [Member] |  |  |
Segment revenue: |  |  |
Revenues | 1,366.3 | 1,333.5 | 1,689.6
Project & Development Services [Member] | EMEA [Member] |  |  |
Segment revenue: |  |  |
Revenues | 870.8 | 785.6 | 904.3
Project & Development Services [Member] | Asia Pacific [Member] |  |  |
Segment revenue: |  |  |
Revenues | 447.8 | 411.0 | 527.6
Advisory, Consulting and Other [Member] | Americas [Member] |  |  |
Segment revenue: |  |  |
Revenues | 440.5 | 390.3 | 406.7
Advisory, Consulting and Other [Member] | EMEA [Member] |  |  |
Segment revenue: |  |  |
Revenues | 281.5 | 274.3 | 300.2
Advisory, Consulting and Other [Member] | Asia Pacific [Member] |  |  |
Segment revenue: |  |  |
Revenues | 249.8 | 196.4 | 197.8
Advisory Fees [Member] | LaSalle Investment Management [Member] |  |  |
Segment revenue: |  |  |
Revenues | 364.7 | 336.4 | 326.4
Transaction Fees & Other [Member] | LaSalle Investment Management [Member] |  |  |
Segment revenue: |  |  |
Revenues | 41.5 | 43.9 | 61.3
Incentive Fees [Member] | LaSalle Investment Management [Member] |  |  |
Segment revenue: |  |  |
Revenues | $ 93.9 | $ 41.5 | $ 138.4

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