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Business Segments, Property and Equipment Expenditures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items]
Document Period End Date	Dec. 31, 2019
Property and equipment expenditures [Abstract]
Net investment activity (less than wholly-owned)	$ 79.2	$ 14.3	$ 2.3
Payments to Acquire Investment Property (less than wholly-owned)		47.1
Property, Plant and Equipment, Additions	267.0	209.0	153.7
Net capital expenditures	187.8	161.9	151.4
Reportable Subsegments [Member] | Americas [Member]
Property and equipment expenditures [Abstract]
Payments to Acquire Property, Plant, and Equipment	135.6	109.1	62.6
Reportable Subsegments [Member] | EMEA [Member]
Property and equipment expenditures [Abstract]
Payments to Acquire Property, Plant, and Equipment	41.6	39.0	44.5
Reportable Subsegments [Member] | Asia Pacific [Member]
Property and equipment expenditures [Abstract]
Payments to Acquire Property, Plant, and Equipment	43.4	25.4	20.3
LaSalle [Member]
Property and equipment expenditures [Abstract]
Payments to Acquire Property, Plant, and Equipment	7.6	3.0	1.2
Corporate [Member]
Property and equipment expenditures [Abstract]
Payments to Acquire Property, Plant, and Equipment	$ 38.8	$ 32.5	$ 25.1

X

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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Payments to Acquire investment property (less than wholly-owned)

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The net cash outflow or inflow from purchases, sales and disposals of property, plant and equipment and other productive assets, including intangibles.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
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Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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