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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount									$ 47.0	$ 125.9	$ 0.0
Revenues	$ 4,889.7	$ 3,969.8	$ 3,903.7	$ 3,555.2	$ 4,343.0	$ 3,522.2	$ 3,470.3	$ 3,117.7	16,318.4	14,453.2	12,991.2
Total operating expenses	4,577.3	3,778.9	3,753.9	3,501.4	4,081.1	3,384.4	3,339.5	3,102.3	15,611.5	13,907.3	12,535.5
Restructuring and acquisition charges	(45.5)	(3.7)	(11.1)	(0.7)	(17.4)	(3.4)	(5.4)	(4.5)	(38.8)	(30.7)	(68.5)
Total Operating income	312.4	190.9	149.8	53.8	261.9	137.8	130.8	15.4	706.9	545.9	455.7
Net Income available to common stockholders	$ 201.1	$ 134.9	$ 107.8	$ 40.3	$ 76.2	$ 98.3	$ 94.3	$ 7.2	$ 484.1	$ 276.0	$ 329.3
Earnings Per Share, Basic	$ 4.41	$ 2.96	$ 2.37	$ 0.89	$ 1.68	$ 2.17	$ 2.08	$ 0.16	$ 10.64	$ 6.09	$ 7.29
Earnings Per Share, Diluted	$ 4.37	$ 2.93	$ 2.35	$ 0.88	$ 1.66	$ 2.15	$ 2.06	$ 0.16	$ 10.54	$ 6.03	$ 7.23
Reportable Subsegments [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment	$ 1,059.2	$ 805.6	$ 846.6	$ 783.6	$ 1,000.6	$ 750.0	$ 721.2	$ 603.2
Revenues									$ 3,495.0	$ 3,075.0	$ 2,447.6
Total operating expenses	971.9	794.5	848.0	803.6	932.0	746.0	711.2	635.2
Total Operating income									77.0	50.6	65.7
Reportable Subsegments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment	934.3	790.0	812.9	711.3	887.9	749.4	743.7	626.3
Revenues									3,248.5	3,007.3	2,618.7
Total operating expenses	865.5	768.2	789.5	712.2	821.3	725.2	722.3	621.3
Total Operating income									113.1	117.2	88.9
Reportable Subsegments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment	2,745.9	2,201.6	2,152.5	1,941.0	2,362.1	1,920.6	1,932.5	1,799.9
Revenues									9,041.0	8,015.1	7,516.8
Total operating expenses	2,575.6	2,097.2	2,051.6	1,894.7	2,231.6	1,829.3	1,836.1	1,767.6
Total Operating income									421.9	350.5	286.0
LaSalle [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment	150.3	172.6	91.7	119.3	92.4	102.2	72.9	88.3
Revenues									533.9	355.8	408.1
Total operating expenses	$ 118.8	$ 115.3	$ 75.9	$ 90.2	$ 78.8	$ 80.5	$ 64.5	$ 73.7
Total Operating income									133.7	58.3	$ 83.6
Quarterly Results of Operations [Member]
Segment Reporting Information [Line Items]
Total operating expenses									15,611.5	13,907.3
Restructuring and acquisition charges									(38.8)	(30.7)
Total Operating income									706.9	545.9
Net Income available to common stockholders									484.1	$ 276.0
Earnings Per Share, Basic										$ 6.09
Earnings Per Share, Diluted										$ 6.03
Quarterly Results of Operations [Member] | Reportable Subsegments [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									3,495.0	$ 3,075.0
Total operating expenses									3,418.0	3,024.4
Quarterly Results of Operations [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									3,248.5	3,007.3
Total operating expenses									3,135.4	2,890.1
Quarterly Results of Operations [Member] | Reportable Subsegments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									9,041.0	8,015.1
Total operating expenses									8,619.1	7,664.6
Quarterly Results of Operations [Member] | LaSalle [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									533.9	355.8
Total operating expenses									$ 400.2	$ 297.5

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