Financial Instruments and Risk Management - Fair Value (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended																	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Not Designated as Hedging Instrument [Member]		Dec. 31, 2012 Not Designated as Hedging Instrument [Member]		Dec. 31, 2013 Not Designated as Hedging Instrument [Member] Share Option [Member]	Dec. 31, 2012 Not Designated as Hedging Instrument [Member] Share Option [Member]	Dec. 31, 2013 Not Designated as Hedging Instrument [Member] Foreign Exchange Contract [Member]	Dec. 31, 2012 Not Designated as Hedging Instrument [Member] Foreign Exchange Contract [Member]	Dec. 31, 2012 Not Designated as Hedging Instrument [Member] Commodity Contract [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Share Option [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Share Option [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Foreign Exchange Contract [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Foreign Exchange Contract [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fixed-rate Debt [Member]	Dec. 31, 2012 Fixed-rate Debt [Member]	Dec. 31, 2013 Sales, General and Administrative [Member] Not Designated as Hedging Instrument [Member] Share Option [Member]	Dec. 31, 2012 Sales, General and Administrative [Member] Not Designated as Hedging Instrument [Member] Share Option [Member]	Sep. 30, 2012 Sales, General and Administrative [Member] Not Designated as Hedging Instrument [Member] Commodity Contract [Member]	Dec. 31, 2013 Other Financing [Member] Not Designated as Hedging Instrument [Member] Foreign Exchange Contract [Member]	Dec. 31, 2012 Other Financing [Member] Not Designated as Hedging Instrument [Member] Foreign Exchange Contract [Member]	Dec. 31, 2013 Cash Flow Hedging [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2012 Cash Flow Hedging [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2013 Cash Flow Hedging [Member] Designated as Hedging Instrument [Member] Foreign Exchange Contract [Member]	Sep. 30, 2013 Cash Flow Hedging [Member] Designated as Hedging Instrument [Member] Foreign Exchange Contract [Member]	Dec. 31, 2012 Cash Flow Hedging [Member] Designated as Hedging Instrument [Member] Interest Rate Swap [Member]
Fair Value Disclosures [Abstract]
Deferred Compensation												$ (174.4)	$ (167.6)
Derivative Asset (Liability) Fair Value			7.0		4.5		0.8	7.7	6.2	(3.2)	0			0.8	7.7	10.0	(1.7)								3.8	[1],[2]	1.5	[1],[2]	3.8	1.5	0
Derivative Instruments, Gain (Loss) Recognized in Income, Net			16.2	[3]	2.2	[3]														7.4	3.8	(1.9)	8.8	0.3
Net Assets Liabilities at Fair Value												(163.6)	(161.6)
Long-term Debt, Fair Value	2,226.5	2,262.3
Long-term Debt	2,138.8	2,138.8																2,138.8	2,138.8
Net Monetary Assets in Venezuela	$ 64.9

[1] All derivative liabilities are presented in other current liabilities or other liabilities.

[2] All derivative assets are presented in other current assets or other assets.

[3] Gain/(Loss) recognized in Income was recorded as follows: Share option in Selling, general and administrative expense and foreign currency contracts in Other financing items, net.