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Derivative Financial Instruments and Hedging - Summary of Notional Amounts and Fair Value (Q3) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Gross notional amount	$ 1,583.0	$ 1,184.8
Derivative, Fair Value, Net	(1.3)	5.6
Other current assets
Derivative [Line Items]
Derivative asset fair value	4.7	5.6
Other current liabilities
Derivative [Line Items]
Liabilities at fair value	(6.0)	0.0
Designated
Derivative [Line Items]
Gross notional amount	787.0	805.1
Derivative, Fair Value, Net	(6.0)	3.5
Designated | Other current assets
Derivative [Line Items]
Derivative asset fair value	0.0	3.5
Designated | Other current liabilities
Derivative [Line Items]
Liabilities at fair value	(6.0)	0.0
Non-Designated
Derivative [Line Items]
Gross notional amount	796.0	379.7
Derivative, Fair Value, Net	4.7	2.1
Non-Designated | Other current assets
Derivative [Line Items]
Derivative asset fair value	4.7	2.1
Non-Designated | Other current liabilities
Derivative [Line Items]
Liabilities at fair value	$ 0.0	$ 0.0

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
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