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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING (FY) (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Summary of Notional Amounts and Fair Value | The following table summarizes the gross notional amounts and fair values of the designated and non-designated hedges discussed in the above sections as of September 30, 2018.
In millions |  | Designated |  |  | Non-Designated |  |  | Total |
Gross notional amount |  | $ | 787.0 |  |  | $ | 796.0 |  |  | $ | 1,583.0 |
Fair Value: |  |  |  |  |  |  |  |  |  |  |  |
Other current assets |  | $ | — |  |  | $ | 4.7 |  |  | $ | 4.7 |
Other current liabilities |  |  | (6.0 | ) |  |  | — |  |  |  | (6.0 | )
Total |  | $ | (6.0 | ) |  | $ | 4.7 |  |  | $ | (1.3 | )
The following table summarizes the gross notional amounts and fair values of the designated and non-designated hedges discussed in the above sections as of December 31, 2017.
In millions |  | Designated |  |  | Non-Designated |  |  | Total |
Gross notional amount |  | $ | 805.1 |  |  | $ | 379.7 |  |  | $ | 1,184.8 |
Fair Value: |  |  |  |  |  |  |  |  |  |  |  |
Other current assets |  | $ | 3.5 |  |  | $ | 2.1 |  |  | $ | 5.6 |
Other current liabilities |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 3.5 |  |  | $ | 2.1 |  |  | $ | 5.6 |
| The following table summarizes the gross notional amounts and fair values of the designated and non-designated hedged discussed in the above sections:
In millions |  | Designated |  |  | Non-Designated |  |  | Total |
Gross notional amount |  | $ | 805.1 |  |  | $ | 379.7 |  |  | $ | 1,184.8 |
Fair Value: |  |  |  |  |  |  |  |  |  |  |  |
Other current assets |  |  | 3.5 |  |  |  | 2.1 |  |  |  | 5.6 |
Other current liabilities |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 3.5 |  |  | $ | 2.1 |  |  | $ | 5.6 |

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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