Financial Instruments (Schedule of Outstanding Currency Price Risk Management Instruments) (Details) (Forward Exchange Contracts [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
Jun. 30, 2012	Sep. 30, 2011
Derivative [Line Items]
US$ Notional	$ 2,380.9	$ 2,374.2
Years Average Maturity	1.1	.8
Cash Flow Hedges [Member]
Derivative [Line Items]
US$ Notional	1,337.8	1,512.1
Years Average Maturity	.5	.4
Maximum length of time of hedged exposures, years	2.2
Net Investment Hedges [Member]
Derivative [Line Items]
US$ Notional	721.7	635.8
Years Average Maturity	2.8	2.0
Hedges Not Designated [Member]
Derivative [Line Items]
US$ Notional	$ 321.4	$ 226.3
Years Average Maturity	.1	.1

Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration