Disclosures About Derivative Instruments and Hedging Activities (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Derivatives Not Designated as Hedging Instruments [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Gain (Loss) recognized in income	$ (16.0)	$ 0.2	$ (12.0)	$ (0.1)
Cash Flow Hedges [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Gain (loss) recognized in AOCI and noncontrolling interests	(72.8)	(16.5)	(192.4)	33.6
Gain (loss) reclassified from AOCI and noncontrolling interest into income	(34.3)	1.5	(100.8)	(29.4)
Commodity Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Gain (Loss) recognized in income			0
Commodity Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Cost of Sales [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Gain (Loss) recognized in income	(15.9)	0.2	(12.6)	(0.4)
Commodity Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Operating Expenses/Other Income [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Gain (Loss) recognized in income	(0.1)	0	0.1	0.3
Commodity Contracts [Member] | Cash Flow Hedges [Member] | Cost of Sales [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Gain (loss) recognized in AOCI and noncontrolling interests	(59.3)	(1.4)	(166.2)	25.4
Gain (loss) reclassified from AOCI and noncontrolling interest into income	(31.0)	3.9	(94.4)	(19.1)
Foreign Currency Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Income [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Gain (Loss) recognized in income			0.5	0
Foreign Currency Contracts [Member] | Cash Flow Hedges [Member] | Cost of Sales [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Gain (loss) recognized in AOCI and noncontrolling interests	3.1	(1.9)	2.8	(3.4)
Gain (loss) reclassified from AOCI and noncontrolling interest into income	0	0	2.0	(0.7)
Foreign Currency Contracts [Member] | Net Investment Hedges [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Gain (loss) recognized in AOCI and noncontrolling interests	0.9	(0.5)	0.9	(1.1)
Interest Rate Contracts [Member] | Cash Flow Hedges [Member] | Interest Expense/Other Income [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Gain (loss) recognized in AOCI and noncontrolling interests	(16.6)	(13.2)	(29.0)	11.6
Gain (loss) reclassified from AOCI and noncontrolling interest into income	$ (3.3)	$ (2.4)	$ (8.4)	$ (9.6)