Disclosures About Derivative Instruments and Hedging Activities (Details 1) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Assets	$ 24.2	$ 14.9
Total Derivatives Liability	(55.4)	(132.9)
Designated as Hedging Instrument [Member]
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Assets	17.0	5.1
Total Derivatives Liability	(42.0)	(115.5)
Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Assets	0	0
Derivatives Not Designated as Hedging Instruments [Member] | Commodity Contracts [Member]
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Liability	(6.7)	(8.0)
Derivative Financial Instruments and Other Assets [Member] | Designated as Hedging Instrument [Member] | Commodity Contracts [Member]
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Assets	16.1	3.3
Derivative Financial Instruments and Other Assets [Member] | Designated as Hedging Instrument [Member] | Foreign currency contracts [Member]
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Assets	0.9	1.8
Derivative Financial Instruments and Other Assets [Member] | Designated as Hedging Instrument [Member] | Cross Currency Interest Rate Contract [Member]
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Assets	0	0
Derivative Financial Instruments and Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Commodity Contracts [Member]
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Assets	7.2	4.5
Derivative Financial Instruments and Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member] | Commodity Contracts [Member]
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Liability	(2.6)	(43.6)
Derivative Financial Instruments and Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member] | Foreign currency contracts [Member]
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Liability	(7.2)	0
Derivative Financial Instruments and Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member] | Cross Currency Interest Rate Contract [Member]
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Liability	(1.2)	0
Derivative Financial Instruments and Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Liability	(31.0)	(71.9)
Derivative Financial Instruments and Other Noncurrent Liabilities [Member] | Accounted for Under ASC 980 [Member] | Commodity Contracts [Member]
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Liability	(6.7)	(9.4)
Derivative Financial Instruments [Member] | Accounted for Under ASC 980 [Member] | Commodity Contracts [Member]
Balance sheet location and fair value of derivative assets and liabilities
Total Derivatives Assets	$ 0	$ 5.3