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Business Segments, Property and Equipment Expenditures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property and equipment expenditures [Abstract]
Total Capital Expenditures	$ 2.3	$ 99.8	$ 1.3
Property, Plant and Equipment, Additions	153.7	316.0	149.1
Net capital expenditures	151.4	216.2	147.8
Reportable Subsegments [Member] | Americas [Member]
Property and equipment expenditures [Abstract]
Total Capital Expenditures	62.6	141.6	55.5
Reportable Subsegments [Member] | EMEA [Member]
Property and equipment expenditures [Abstract]
Total Capital Expenditures	44.5	54.2	42.9
Reportable Subsegments [Member] | Asia Pacific [Member]
Property and equipment expenditures [Abstract]
Total Capital Expenditures	20.3	16.1	14.4
LaSalle [Member]
Property and equipment expenditures [Abstract]
Total Capital Expenditures	1.2	67.9	8.4
Corporate [Member]
Property and equipment expenditures [Abstract]
Total Capital Expenditures	$ 25.1	$ 36.2	$ 27.9

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- Definition

The net cash outflow or inflow from purchases, sales and disposals of property, plant and equipment and other productive assets, including intangibles.

+ References

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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- Definition

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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