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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, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Derivatives Not Designated as Hedging Instruments: |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | $ (299.5) | $ 166.6 | $ 140.4
Derivatives Not Designated as Hedging Instruments: | Foreign currency contracts | Other non-operating income (expense), net |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | 37.7 | 16.2 | (23.8)
Derivatives Not Designated as Hedging Instruments: | Commodity contracts | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | (344.1) | 155.4 | 166.0
Derivatives Not Designated as Hedging Instruments: | Commodity contracts | Revenues |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | 7.2 | (5.3) | (2.0)
Derivatives Not Designated as Hedging Instruments: | Commodity contracts | Operating and administrative expenses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | (0.3) | 0.3 | 0.2
Cash Flow Hedges: |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in AOCI | (10.5) | 1.8 | 2.2
Gain (Loss) Reclassified from AOCI into Income | (2.4) | (6.9) | 13.8
Cash Flow Hedges: | Foreign currency contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in AOCI | 1.2 | 0.4 | 0.2
Cash Flow Hedges: | Foreign currency contracts | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Reclassified from AOCI into Income | 2.4 | (3.0) | 17.8
Cash Flow Hedges: | Cross-currency swaps |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in AOCI | (0.1) | 1.2 | 0.5
Cash Flow Hedges: | Cross-currency swaps | Interest expense /other operating income, net |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Reclassified from AOCI into Income | (0.3) | 1.1 | (0.1)
Cash Flow Hedges: | Interest rate contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in AOCI | (11.6) | 0.2 | 1.5
Cash Flow Hedges: | Interest rate contracts | Interest expense |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Reclassified from AOCI into Income | (4.5) | (5.0) | (3.9)
Net Investment Hedges: | Foreign currency contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Foreign currency contracts | $ 17.4 | $ 0.0 | $ 0.0

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