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Business Segments, Assets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	$ 10,025.5	$ 9,254.4
Investments In Real Estate Ventures	356.9	376.2
Reportable Subsegments [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	5,288.9	4,745.4
Investments In Real Estate Ventures	17.0	14.5
Reportable Subsegments [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	2,325.4	2,367.5
Investments In Real Estate Ventures	3.5	3.5
Reportable Subsegments [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	1,437.3	1,305.0
Investments In Real Estate Ventures	11.9	9.6
LaSalle [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	666.8	548.6
Investments In Real Estate Ventures	305.8	346.9
Corporate [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	307.1	287.9
Investments In Real Estate Ventures	$ 18.7	$ 1.7

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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