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Business Segments, Assets (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	$ 7,629.4	$ 6,187.1
Investments In Real Estate Ventures	355.4	311.5
Reportable Subsegments [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	4,001.0	3,174.7
Investments In Real Estate Ventures	10.7	9.4
Reportable Subsegments [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	1,864.7	1,486.7
Investments In Real Estate Ventures	2.8	1.0
Reportable Subsegments [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	1,065.3	901.2
Investments In Real Estate Ventures	7.5	3.8
LaSalle [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	558.6	513.9
Investments In Real Estate Ventures	334.4	297.3
Corporate [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	139.8	110.6
Investments In Real Estate Ventures	$ 0.0	$ 0.0

X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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