Disclosures About Derivative Instruments and Hedging Activities (Details 2) (USD $) In Millions	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
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 or (Loss) Recognized in Income	$ 2.1	$ 1.3	$ (0.6)
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 or (Loss) Recognized in Income	0.3	0.2	0.7
Commodity Contracts [Member] | Cash Flow Hedges [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Derivative instruments gain loss recognized in other comprehensive income and noncontrolling interests effective portion	2.2	(41.7)	(241.1)
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
Derivative instruments gain loss reclassified from other comprehensive income and noncontrolling interest into income effective portion	(17.4)	(21.0)	(305.8)
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 or (Loss) Recognized in Income	(6.1)
Foreign currency contracts [Member] | Cash Flow Hedges [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Derivative instruments gain loss recognized in other comprehensive income and noncontrolling interests effective portion	6.9	3.2	(2.1)
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
Derivative instruments gain loss reclassified from other comprehensive income and noncontrolling interest into income effective portion	(0.8)	0.7	5.0
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
Derivative instruments gain loss recognized in other comprehensive income and noncontrolling interests effective portion	0.2	5.0	(2.0)
Interest Rate Contracts [Member] | Cash Flow Hedges [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Derivative instruments gain loss recognized in other comprehensive income and noncontrolling interests effective portion	(35.8)	(12.6)	(46.7)
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
Derivative instruments gain loss reclassified from other comprehensive income and noncontrolling interest into income effective portion	(14.1)	(28.2)	(7.0)
Cash Flow Hedges [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Derivative instruments gain loss recognized in other comprehensive income and noncontrolling interests effective portion	(26.7)	(51.1)	(289.9)
Derivative instruments gain loss reclassified from other comprehensive income and noncontrolling interest into income effective portion	(32.3)	(48.5)	(307.8)
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 or (Loss) Recognized in Income	$ (3.7)	$ 1.5	$ 0.1