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Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | $ 224.3 | $ 10.8 | $ 305.0 | $ 75.4
Restructuring and acquisition charges | (18.1) | (28.2) | (35.3) | (42.3)
Depreciation and amortization | 54.5 | 56.9 | 107.5 | 111.9
Equity in earnings (losses) | (40.8) | (14.7) | (89.3) | 13.6
Segment revenue: |  |  |  |
Revenue Before Reimbursements | 2,507.5 | 1,828.5 | 4,637.1 | 4,061.5
Revenue | 4,495.0 | 3,670.4 | 8,532.1 | 7,766.4
Exclusive of LaSalle Investment Company II [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 1.6 | 1.8 | 3.3 | 3.6
Equity in earnings (losses) | (23.3) | (11.3) | (36.3) | 29.0
Operating Income (Loss), Including Income (Loss) from Equity Method Investments | 39.8 | 25.4 | 59.2 | (0.7)
Segment revenue: |  |  |  |
Revenue | 115.8 | 99.9 | 207.0 | 204.8
Americas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 34.3 | 39.1 | 67.4 | 76.5
Equity in earnings (losses) | (16.5) | (2.9) | (51.0) | (15.6)
Operating Income (Loss), Including Income (Loss) from Equity Method Investments | 206.6 | 42.5 | 351.6 | 137.1
Segment revenue: |  |  |  |
Revenue | 2,701.5 | 2,229.0 | 5,145.4 | 4,752.1
EMEA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 11.0 | 9.0 | 21.9 | 18.2
Equity in earnings (losses) | 0.0 | 0.0 | 0.0 | 0.0
Operating Income (Loss), Including Income (Loss) from Equity Method Investments | 0.3 | (33.4) | (35.5) | (53.9)
Segment revenue: |  |  |  |
Revenue | 809.8 | 626.2 | 1,526.0 | 1,382.1
Asia Pacific [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 7.6 | 7.0 | 14.9 | 13.6
Equity in earnings (losses) | (1.0) | (0.5) | (2.0) | 0.2
Operating Income (Loss), Including Income (Loss) from Equity Method Investments | 36.5 | 19.2 | 54.3 | 21.6
Segment revenue: |  |  |  |
Revenue | 867.9 | 715.3 | 1,653.7 | 1,427.4
Leasing [Member] | Americas [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 484.2 | 278.1 | 847.9 | 697.0
Leasing [Member] | EMEA [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 74.0 | 46.7 | 128.4 | 94.8
Leasing [Member] | Asia Pacific [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 52.7 | 33.8 | 84.1 | 59.2
Capital Markets [Member] | Americas [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 296.0 | 140.8 | 512.9 | 388.2
Capital Markets [Member] | EMEA [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 99.4 | 50.0 | 173.6 | 123.2
Capital Markets [Member] | Asia Pacific [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 53.0 | 24.0 | 82.3 | 45.7
Property & Facility Management [Member] | Americas [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 1,517.2 | 1,439.5 | 3,012.0 | 2,898.3
Property & Facility Management [Member] | EMEA [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 361.9 | 320.5 | 706.0 | 695.5
Property & Facility Management [Member] | Asia Pacific [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 587.5 | 515.2 | 1,162.6 | 1,047.2
Project & Development Services [Member] | Americas [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 303.0 | 275.3 | 572.8 | 581.7
Project & Development Services [Member] | EMEA [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 204.8 | 164.3 | 388.5 | 367.5
Project & Development Services [Member] | Asia Pacific [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 109.9 | 97.2 | 208.2 | 192.0
Advisory, Consulting and Other [Member] | Americas [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 101.1 | 95.3 | 199.8 | 186.9
Advisory, Consulting and Other [Member] | EMEA [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 69.7 | 44.7 | 129.5 | 101.1
Advisory, Consulting and Other [Member] | Asia Pacific [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 64.8 | 45.1 | 116.5 | 83.3
Advisory Fees [Member] | Exclusive of LaSalle Investment Company II [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 89.6 | 80.9 | 173.1 | 166.5
Transaction Fees & Other [Member] | Exclusive of LaSalle Investment Company II [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | 11.0 | 4.8 | 18.7 | 18.4
Incentive Fees [Member] | Exclusive of LaSalle Investment Company II [Member] |  |  |  |
Segment revenue: |  |  |  |
Revenue | $ 15.2 | $ 14.2 | $ 15.2 | $ 19.9

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