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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, 2017 | Dec. 31, 2016
Derivatives Not Designated as Hedging Instruments |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | $ 18.4 | $ 109.8
Cash Flow Hedges |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in AOCI | (0.6) | 18.3
Gain (Loss) Reclassified from AOCI into Income | 0.5 | 6.6
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Cost of sales |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | 24.4 | 108.5
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Revenues |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | (1.3) | 0.1
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Operating and administrative expenses |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | 0.1 | (0.1)
Foreign currency contracts | Derivatives Not Designated as Hedging Instruments | (Losses) gains on foreign currency contracts, net |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | (4.8) | 1.3
Foreign currency contracts | Cash Flow Hedges |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in AOCI | (1.4) | 17.2
Foreign currency contracts | Cash Flow Hedges | Cost of sales |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Reclassified from AOCI into Income | 0.8 | 7.9
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 | 0.2 | (0.3)
Interest rate contracts | Cash Flow Hedges |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in AOCI | 0.7 | 1.2
Interest rate contracts | Cash Flow Hedges | Interest expense |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Reclassified from AOCI into Income | $ (0.5) | $ (1.0)

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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 gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + 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 (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or 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 (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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