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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