Financial Instruments and Risk Management - Derivatives (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Sep. 30, 2012
Derivative [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 2,552.9
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset (Liability) Fair Value	3.2				3.4
Derivative Instruments, Gain (Loss) Recognized in Income, Net	2.2	[1]	7.0	[1]
Not Designated as Hedging Instrument [Member] | Share Option [Member]
Derivative [Line Items]
Derivative Asset (Liability) Fair Value	3.6				2.5
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivative [Line Items]
Derivative Asset (Liability) Fair Value	0				1.6
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(1.9)	[1]	0	[1]
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Asset (Liability) Fair Value	(0.4)				(0.7)
Debt With Variable Interest Rates [Member]
Derivative [Line Items]
Debt, Long-term and Short-term, Combined Amount	289.2
Sales, General and Administrative [Member] | Not Designated as Hedging Instrument [Member] | Share Option [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	3.8	[1]	7.9	[1]
Other Financing [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(1.9)
Other Financing [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	0.3	[1]	(0.9)	[1]
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset (Liability) Fair Value	1.8	[2],[3]			(6.2)	[2],[3]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	6.7	[4]	(2.7)	[4]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(1.3)	[5],[6]	(1.9)	[5],[6]
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivative [Line Items]
Derivative Asset (Liability) Fair Value					0
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net			(0.4)	[4]
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Asset (Liability) Fair Value	1.8	[2],[3]			(5.9)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	1.6
Derivative, Number of Instruments Held	64
Derivative, Notional Amount	353
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	6.7	[4]	(3.7)	[4]
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Asset (Liability) Fair Value	0	[2],[3]			(0.3)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	0	[4]	1.4	[4]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(0.3)	[5],[6]	0	[5],[6]
Cash Flow Hedging [Member] | Other Financing [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(1.0)	[5],[6]	(2.1)	[5],[6]
Cash Flow Hedging [Member] | Cost of Sales [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net			0.2	[5],[6]
Cash Flow Hedging [Member] | Interest Expense [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (0.3)

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

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

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

[4] OCI is defined as other comprehensive income.

[5] Each of these derivative instruments had a high correlation to the underlying exposure being hedged for the periods indicated and had been deemed highly effective in offsetting associated risk.

[6] Gain/(Loss) reclassified to Income was recorded as follows: Foreign currency contracts in other financing and commodity contracts in Cost of products sold.