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Business Segments, Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	$ 13,672.6	$ 10,025.5
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	404.2	356.9
Reportable Subsegments [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	8,256.4	5,288.9
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	23.9	17.0
Reportable Subsegments [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	2,658.4	2,325.4
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	2.4	3.5
Reportable Subsegments [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	1,642.8	1,437.3
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	13.3	11.9
LaSalle [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	774.5	666.8
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	321.7	305.8
Corporate [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	340.5	307.1
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ 42.9	$ 18.7

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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