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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
	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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Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss)

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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