Financial Instruments (Schedule of Gain/Loss Related to Derivative Instruments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Cash Flow Hedges [Member]
Derivative [Line Items]
Net gain (loss) recognized in OCI (effective portion)	$ 16.0		$ (9.3)
Net (gain) loss reclassified from OCI to sales/cost of sales (effective portion)	0.7		0.3
Net (gain) loss reclassified from OCI to other income, net (effective portion)	(15.1)		8.5
Net (gain) loss reclassified from OCI to interest expense (effective portion)	0		1.0
Net (gain) loss reclassified from OCI to other income, net (ineffective portion)	0.1		0.1
Cash Flow Hedges [Member] | Forward Exchange Contracts [Member]
Derivative [Line Items]
Net gain (loss) recognized in OCI (effective portion)	14.9		(12.8)
Net (gain) loss reclassified from OCI to sales/cost of sales (effective portion)	0.7		0.3
Net (gain) loss reclassified from OCI to other income, net (effective portion)	(15.1)		8.5
Net (gain) loss reclassified from OCI to interest expense (effective portion)	(0.4)		0.7
Net (gain) loss reclassified from OCI to other income, net (ineffective portion)	0.1		0.1
Cash Flow Hedges [Member] | Other Contracts [Member]
Derivative [Line Items]
Net gain (loss) recognized in OCI (effective portion)	1.1	[1]	3.5	[1]
Net (gain) loss reclassified from OCI to sales/cost of sales (effective portion)	0	[1]	0	[1]
Net (gain) loss reclassified from OCI to other income, net (effective portion)	0	[1]	0	[1]
Net (gain) loss reclassified from OCI to interest expense (effective portion)	0.4	[1]	0.3	[1]
Net (gain) loss reclassified from OCI to other income, net (ineffective portion)	0	[1]	0	[1]
Fair Value Hedges [Member]
Derivative [Line Items]
Net gain (loss) recognized in net income (loss)	(3.7)	[2]	(0.9)	[2]
Fair Value Hedges [Member] | Other Contracts [Member]
Derivative [Line Items]
Net gain (loss) recognized in net income (loss)	(3.7)	[1],[2]	(0.9)	[1],[2]
Net Investment Hedges [Member]
Derivative [Line Items]
Net gain (loss) recognized in OCI	(31.8)		46.6
Net Investment Hedges [Member] | Forward Exchange Contracts [Member]
Derivative [Line Items]
Net gain (loss) recognized in OCI	(13.3)		9.1
Net Investment Hedges [Member] | Foreign Currency Debt [Member]
Derivative [Line Items]
Net gain (loss) recognized in OCI	(18.8)		37.3
Net Investment Hedges [Member] | Other Contracts [Member]
Derivative [Line Items]
Net gain (loss) recognized in OCI	0.3	[1]	0.2	[1]
Hedges Not Designated [Member]
Derivative [Line Items]
Net gain (loss) recognized in net income (loss)	(0.1)	[3]	(2.1)	[3]
Hedges Not Designated [Member] | Forward Exchange Contracts [Member]
Derivative [Line Items]
Net gain (loss) recognized in net income (loss)	$ (0.1)	[3]	$ (2.1)	[3]

[1] Other includes the impact on other comprehensive income (OCI) and earnings related to interest rate and cross currency interest rate swaps.

[2] The impact of the fair value hedges noted above was largely offset by gains and losses resulting from the impact of changes in related interest rates on recognized outstanding debt.

[3] The impact of the non-designated hedges noted above was largely offset by gains and losses, respectively, resulting from the impact of changes in exchange rates on recognized assets and liabilities denominated in nonfunctional currencies