Financial Instruments and Risk Management - Fair Value (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Sep. 30, 2012
Fair Value Disclosures [Abstract]
Long-term Debt, Fair Value					$ 2,438.0
Long-term Debt	2,263.7				2,370.1
Net Monetary Assets in Venezuela	42
Not Designated as Hedging Instrument [Member]
Fair Value Disclosures [Abstract]
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]
Fair Value Disclosures [Abstract]
Derivative Asset (Liability) Fair Value	3.6				2.5
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Fair Value Disclosures [Abstract]
Derivative Asset (Liability) Fair Value	(0.4)				(0.7)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Fair Value Disclosures [Abstract]
Derivative Asset (Liability) Fair Value	0				1.6
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(1.9)	[1]	0	[1]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Disclosures [Abstract]
Deferred Compensation	(160.2)				(161.6)
Net Assets Liabilities at Fair Value	(155.2)				(164.4)
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Disclosures [Abstract]
Derivative Asset (Liability) Fair Value	1.4				(6.6)
Fair Value, Measurements, Recurring [Member] | Cash Flow Hedging [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Disclosures [Abstract]
Derivative Asset (Liability) Fair Value	0				1.6
Fair Value, Measurements, Recurring [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Disclosures [Abstract]
Derivative Asset (Liability) Fair Value	0				(0.3)
Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Share Option [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Disclosures [Abstract]
Derivative Asset (Liability) Fair Value	3.6				2.5
Fixed-rate Debt [Member]
Fair Value Disclosures [Abstract]
Long-term Debt, Fair Value	2,424.9
Long-term Debt	$ 2,263.7				$ 2,263.6

[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.