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Derivative Instruments and Hedging Activities - Effects of Derivative Instruments on Condensed Consolidated Statements of Income and Changes in AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Not Designated as Hedging Instruments |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | $ 166.6 | $ 140.4 | $ (67.3)
Not Designated as Hedging Instruments | Foreign currency contracts | Gain (loss) on foreign currency contracts, net |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | 16.2 | (23.8) | 0.0
Not Designated as Hedging Instruments | Commodity contracts | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | 155.4 | 166.0 | (65.0)
Not Designated as Hedging Instruments | Commodity contracts | Revenues |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | (5.3) | (2.0) | (2.2)
Not Designated as Hedging Instruments | Commodity contracts | Operating and administrative expenses / other operating income, net |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | 0.3 | 0.2 | (0.1)
Cash Flow Hedges |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in AOCI | 1.8 | 2.2 | (28.8)
Gain (Loss) Reclassified from AOCI and Noncontrolling Interests into Income | (6.9) | 13.8 | 13.1
Cash Flow Hedges | Foreign currency contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in AOCI | 0.4 | 0.2 | 3.6
Cash Flow Hedges | Foreign currency contracts | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Reclassified from AOCI and Noncontrolling Interests into Income | (3.0) | 17.8 | 17.2
Cash Flow Hedges | Cross-currency swaps |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in AOCI | 1.2 | 0.5 | 0.1
Cash Flow Hedges | Cross-currency swaps | Interest expense /other operating income, net |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Reclassified from AOCI and Noncontrolling Interests into Income | 1.1 | (0.1) | 0.4
Cash Flow Hedges | Interest rate contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in AOCI | 0.2 | 1.5 | (32.5)
Cash Flow Hedges | Interest rate contracts | Interest expense |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Reclassified from AOCI and Noncontrolling Interests into Income | $ (5.0) | $ (3.9) | $ (4.5)

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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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