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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 5,400.5	$ 4,495.6	$ 4,266.5	$ 3,820.6	$ 4,889.7	$ 3,969.8	$ 3,903.7	$ 3,555.2	$ 17,983.2	$ 16,318.4	$ 14,453.2
Total operating expenses	5,032.2	4,324.0	4,116.4	3,795.2	4,577.3	3,778.9	3,753.9	3,501.4	17,267.8	15,611.5	13,907.3
Restructuring and acquisition charges	70.1	70.0	25.7	18.6	45.5	3.7	(11.1)	0.7	184.4	38.8	30.7
Total Operating income	368.3	171.6	150.1	25.4	312.4	190.9	149.8	53.8	715.4	706.9	545.9
Net Income available to common stockholders	$ 273.7	$ 128.9	$ 110.5	$ 21.3	$ 201.1	$ 134.9	$ 107.8	$ 40.3	$ 534.4	$ 484.1	$ 276.0
Earnings Per Share, Basic	$ 5.31	$ 2.50	$ 2.42	$ 0.47	$ 4.41	$ 2.96	$ 2.37	$ 0.89	$ 10.98	$ 10.64	$ 6.09
Earnings Per Share, Diluted	$ 5.23	$ 2.47	$ 2.40	$ 0.46	$ 4.37	$ 2.93	$ 2.35	$ 0.88	$ 10.87	$ 10.54	$ 6.03
Reportable Subsegments [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment	$ 1,066.4	$ 862.6	$ 818.3	$ 723.4	$ 1,059.2	$ 805.6	$ 846.6	$ 783.6
Revenues									$ 3,470.7	$ 3,495.0	$ 3,075.0
Total operating expenses	1,002.5	848.8	819.6	752.8	971.9	794.5	848.0	803.6
Total Operating income									47.0	77.0	50.6
Reportable Subsegments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment	969.8	833.8	855.2	748.7	934.3	790.0	812.9	711.3
Revenues									3,407.5	3,248.5	3,007.3
Total operating expenses	900.6	803.0	828.6	748.0	865.5	768.2	789.5	712.2
Total Operating income									127.3	113.1	117.2
Reportable Subsegments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment	3,177.6	2,687.6	2,463.6	2,250.1	2,745.9	2,201.6	2,152.5	1,941.0
Revenues									10,578.9	9,041.0	8,015.1
Total operating expenses	2,923.7	2,511.2	2,343.1	2,189.5	2,575.6	2,097.2	2,051.6	1,894.7
Total Operating income									611.4	421.9	350.5
LaSalle [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment	186.7	111.6	129.4	98.4	150.3	172.6	91.7	119.3
Revenues									526.1	533.9	355.8
Total operating expenses	$ 135.3	$ 91.0	$ 99.4	$ 86.3	$ 118.8	$ 115.3	$ 75.9	$ 90.2
Total Operating income									114.1	133.7	$ 58.3
Quarterly Results of Operations [Member]
Segment Reporting Information [Line Items]
Total operating expenses									17,267.8	15,611.5
Restructuring and acquisition charges									184.4	38.8
Total Operating income									715.4	706.9
Net Income available to common stockholders									534.4	$ 484.1
Earnings Per Share, Basic										$ 10.64
Earnings Per Share, Diluted										$ 10.54
Quarterly Results of Operations [Member] | Reportable Subsegments [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									3,470.7	$ 3,495.0
Total operating expenses									3,423.7	3,418.0
Quarterly Results of Operations [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									3,407.5	3,248.5
Total operating expenses									3,280.2	3,135.4
Quarterly Results of Operations [Member] | Reportable Subsegments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									10,578.9	9,041.0
Total operating expenses									9,967.5	8,619.1
Quarterly Results of Operations [Member] | LaSalle [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									526.1	533.9
Total operating expenses									$ 412.0	$ 400.2

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