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Derivative Instruments and Hedging Activities - Effects of Derivative Instruments on the Condensed Consolidated Statements of Income and Changes in AOCI (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Derivatives Not Designated as Hedging Instruments |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | $ (154.0) | $ 18.4
Cash Flow Hedges |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in AOCI | (1.9) | (0.6)
Gain (Loss) Reclassified from AOCI into Income | (1.0) | 0.5
Foreign currency contracts | Derivatives Not Designated as Hedging Instruments | Other non-operating income (expense), net |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | 8.9 | (4.8)
Foreign currency contracts | Cash Flow Hedges |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in AOCI | 1.0 | (1.4)
Foreign currency contracts | Cash Flow Hedges | Cost of sales |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Reclassified from AOCI into Income | 0.8 | 0.8
Foreign currency contracts | Net Investment Hedges |  |
Derivative Instruments, Gain (Loss) |  |
Gain (loss) recognized in AOCI, net investment hedge | 0.9 | 0.0
Cross-currency contracts | Cash Flow Hedges |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in AOCI | (0.1) | 0.1
Cross-currency contracts | Cash Flow Hedges | Interest expense/other operating income, net |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Reclassified from AOCI into Income | (0.3) | 0.2
Interest rate contracts | Cash Flow Hedges |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in AOCI | (2.8) | 0.7
Interest rate contracts | Cash Flow Hedges | Interest expense |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Reclassified from AOCI into Income | (1.5) | (0.5)
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Cost of sales |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | (159.7) | 24.4
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Revenues |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | (2.8) | (1.3)
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Operating and administrative expenses |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | $ (0.4) | $ 0.1

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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- Definition The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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