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Business Segments, Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Segment Reporting, Asset Reconciling Item [Line Items] |  |
Identifiable Assets | $ 8,014.5 | $ 7,629.4
Investments In Real Estate Ventures | 376.2 | 355.4
Reportable Subsegments [Member] | Americas [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Identifiable Assets | 3,774.3 | 4,001.0
Investments In Real Estate Ventures | 14.5 | 10.7
Reportable Subsegments [Member] | EMEA [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Identifiable Assets | 2,264.3 | 1,864.7
Investments In Real Estate Ventures | 3.5 | 2.8
Reportable Subsegments [Member] | Asia Pacific [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Identifiable Assets | 1,139.4 | 1,065.3
Investments In Real Estate Ventures | 9.6 | 7.5
LaSalle [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Identifiable Assets | 548.6 | 558.6
Investments In Real Estate Ventures | 346.9 | 334.4
Corporate [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Identifiable Assets | 287.9 | 139.8
Investments In Real Estate Ventures | $ 1.7 | $ 0.0

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- Definition 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 + Details
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