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Employee Benefit Plans - Additional Information (Q3) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Defined Benefit Pension Plans | Foreign Plan
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected plan contributions	$ 7.3	$ 7.3

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- Definition

Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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