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Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage of assets from countries having restrictions |  |  |  |  |  |  |  |  | 6.00% | 5.00% |
Segment revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 7,932.4 | $ 6,803.8 | $ 5,965.7
Total segment fee revenue | $ 2,535.5 | $ 1,947.0 | $ 1,834.7 | $ 1,615.2 | $ 2,158.2 | $ 1,705.2 | $ 1,603.6 | $ 1,336.8 |  |  |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 167.2 | 141.8 | 108.1
Total operating expenses | 2,243.3 | 1,828.9 | 1,730.4 | 1,592.9 | 1,931.9 | 1,634.2 | 1,489.7 | 1,307.4 | 7,395.5 | 6,363.2 | 5,435.9
Total Operating income | 292.2 | 118.1 | 104.3 | 22.3 | 226.3 | 71.0 | 113.9 | 29.4 | 536.9 | 440.6 | 529.8
Equity in earnings (losses) |  |  |  |  |  |  |  |  | 44.4 | 33.8 | 77.4
Segment Reconciling Items: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 7,932.4 | 6,803.8 | 5,965.7
Total segment operating expenses before restructuring and acquisition charges |  |  |  |  |  |  |  |  | 7,364.8 | 6,294.7 | 5,401.8
Operating income before restructuring and acquisition charges |  |  |  |  |  |  |  |  | 567.6 | 509.1 | 563.9
Restructuring and acquisition charges | 17.4 | 3.4 | 5.4 | 4.5 | 32.6 | 18.0 | 10.3 | 7.6 | 30.7 | 68.5 | 34.1
Total Operating income | 292.2 | 118.1 | 104.3 | 22.3 | 226.3 | 71.0 | 113.9 | 29.4 | 536.9 | 440.6 | 529.8
Reportable Subsegments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment revenue: |  |  |  |  |  |  |  |  |  |  |
Total segment fee revenue |  |  |  |  |  |  |  |  | 6,696.1 | 5,756.8 | 5,165.2
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Gross contract costs |  |  |  |  |  |  |  |  | (1,220.6) | (1,023.5) | (801.3)
Reportable Subsegments [Member] | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Segment revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,354.5 | 2,965.9 | 2,605.5
Gross contract costs |  |  |  |  |  |  |  |  | (177.1) | (192.0) | (212.1)
Derivative, Gain (Loss) on Derivative, Net |  |  |  |  |  |  |  |  | 15.7 | 23.5 | (0.8)
Total segment fee revenue |  |  |  |  |  |  |  |  | 3,161.7 | 2,750.4 | 2,394.2
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Compensation, operating and administrative expenses |  |  |  |  |  |  |  |  | 2,915.7 | 2,611.7 | 2,283.5
Depreciation and amortization |  |  |  |  |  |  |  |  | 97.5 | 84.3 | 62.9
Total operating expenses | 887.8 | 723.3 | 716.8 | 685.3 | 795.2 | 707.3 | 622.2 | 571.1 | 3,013.2 | 2,696.0 | 2,346.4
Gross contract costs |  |  |  |  |  |  |  |  | (177.1) | (192.0) | (212.1)
Total fee based segment operating expenses |  |  |  |  |  |  |  |  | 2,836.1 | 2,504.0 | 2,134.3
Total Operating income |  |  |  |  |  |  |  |  | 341.3 | 269.9 | 259.1
Equity in earnings (losses) |  |  |  |  |  |  |  |  | (0.2) | 1.3 | 5.8
Operating Income (Loss), Including Income (Loss) from Equity Method Investments |  |  |  |  |  |  |  |  | 341.1 | 271.2 | 264.9
Segment Reconciling Items: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,354.5 | 2,965.9 | 2,605.5
Total Operating income |  |  |  |  |  |  |  |  | 341.3 | 269.9 | 259.1
Reportable Subsegments [Member] | EMEA [Member] |  |  |  |  |  |  |  |  |  |  |
Segment revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,586.0 | 2,077.5 | 1,803.1
Gross contract costs |  |  |  |  |  |  |  |  | (654.0) | (563.3) | (397.4)
Total segment fee revenue |  |  |  |  |  |  |  |  | 1,932.0 | 1,514.2 | 1,405.7
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Compensation, operating and administrative expenses |  |  |  |  |  |  |  |  | 2,487.4 | 1,972.7 | 1,648.1
Depreciation and amortization |  |  |  |  |  |  |  |  | 44.6 | 37.4 | 27.5
Total operating expenses | 786.7 | 633.0 | 583.4 | 528.9 | 635.6 | 523.5 | 465.8 | 385.2 | 2,532.0 | 2,010.1 | 1,675.6
Gross contract costs |  |  |  |  |  |  |  |  | (654.0) | (563.3) | (397.4)
Total fee based segment operating expenses |  |  |  |  |  |  |  |  | 1,878.0 | 1,446.8 | 1,278.2
Total Operating income |  |  |  |  |  |  |  |  | 54.0 | 67.4 | 127.5
Equity in earnings (losses) |  |  |  |  |  |  |  |  | 0.3 | (0.1) | 0.8
Operating Income (Loss), Including Income (Loss) from Equity Method Investments |  |  |  |  |  |  |  |  | 54.3 | 67.3 | 128.3
Segment Reconciling Items: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,586.0 | 2,077.5 | 1,803.1
Total Operating income |  |  |  |  |  |  |  |  | 54.0 | 67.4 | 127.5
Reportable Subsegments [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Segment revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,636.6 | 1,352.6 | 1,160.1
Gross contract costs |  |  |  |  |  |  |  |  | (389.5) | (268.2) | (191.8)
Total segment fee revenue |  |  |  |  |  |  |  |  | 1,247.1 | 1,084.4 | 968.3
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Compensation, operating and administrative expenses |  |  |  |  |  |  |  |  | 1,499.9 | 1,247.2 | 1,055.8
Depreciation and amortization |  |  |  |  |  |  |  |  | 22.1 | 17.3 | 15.5
Total operating expenses | 472.6 | 388.8 | 360.2 | 300.4 | 383.2 | 313.5 | 303.3 | 264.6 | 1,522.0 | 1,264.5 | 1,071.3
Gross contract costs |  |  |  |  |  |  |  |  | (389.5) | (268.2) | (191.8)
Total fee based segment operating expenses |  |  |  |  |  |  |  |  | 1,132.5 | 996.3 | 879.5
Total Operating income |  |  |  |  |  |  |  |  | 114.6 | 88.1 | 88.8
Equity in earnings (losses) |  |  |  |  |  |  |  |  | 3.2 | 1.1 | 0.7
Operating Income (Loss), Including Income (Loss) from Equity Method Investments |  |  |  |  |  |  |  |  | 117.8 | 89.2 | 89.5
Segment Reconciling Items: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,636.6 | 1,352.6 | 1,160.1
Total Operating income |  |  |  |  |  |  |  |  | 114.6 | 88.1 | 88.8
LaSalle [Member] |  |  |  |  |  |  |  |  |  |  |
Segment revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 355.3 | 407.8 | 397.0
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Compensation, operating and administrative expenses |  |  |  |  |  |  |  |  | 294.6 | 321.3 | 306.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 3.0 | 2.8 | 2.2
Total operating expenses | $ 78.8 | $ 80.4 | $ 64.6 | $ 73.8 | $ 85.3 | $ 71.9 | $ 88.1 | $ 78.9 | 297.6 | 324.1 | 308.5
Total Operating income |  |  |  |  |  |  |  |  | 57.7 | 83.7 | 88.5
Equity in earnings (losses) |  |  |  |  |  |  |  |  | 41.1 | 31.5 | 70.1
Operating Income (Loss), Including Income (Loss) from Equity Method Investments |  |  |  |  |  |  |  |  | 98.8 | 115.2 | 158.6
Segment Reconciling Items: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 355.3 | 407.8 | 397.0
Total Operating income |  |  |  |  |  |  |  |  | $ 57.7 | $ 83.7 | $ 88.5

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