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Business Segments, Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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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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