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Derivatives (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | --- | ---
4.00% Notes, Due October 1, 2026 [Member] |  |  |
Derivative [Line Items] |  |  |
Interest rate |  | 4.00% | 4.00%
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate | 1.76% | 1.76% |
Notional value | $ 300.0 | $ 300.0 |
Derivative net (loss) gain estimated to be reclassified from AOCI into earnings over the next 12 months | 1.4 |  |
Cash Flow Hedging [Member] | Commodity Swaps [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative net (loss) gain estimated to be reclassified from AOCI into earnings over the next 12 months | (0.3) |  |
Cash Flow Hedging [Member] | Foreign Exchange Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Notional value | 261.6 | 330.5 |
Derivative net (loss) gain estimated to be reclassified from AOCI into earnings over the next 12 months | (3.9) |  |
Fair Value Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Credit reserve on derivative assets | 0.1 | 0.1 |
Posted cash collateral | 0.0 | 0.0 |
Posted standby letters of credit | 0.0 | 0.0 |
Not Designated as Hedging [Member] | Foreign Exchange Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Notional value | $ 105.2 | $ 109.7 |

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- 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 + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of credit risk valuation adjustment to derivative assets to properly reflect the credit quality of the counterparties. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + 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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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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