Derivative Instruments And Hedging Activities (Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Derivative Assets (Current) [Member] \| Foreign Exchange Contracts [Member]
Derivatives assets designated as hedging instruments under ASC 815	$ 1.2	$ 2.8
Derivatives assets not designated as hedging instruments under ASC 815	4.6	34.2
Derivative Assets (Current) [Member] \| Customer Supply Agreements [Member]
Derivatives assets not designated as hedging instruments under ASC 815	67.8	45.6
Foreign Exchange Contracts [Member] \| Deposits And Miscellaneous [Member]
Derivatives assets not designated as hedging instruments under ASC 815		2.0
Accounts Receivable [Member]
Total derivatives assets	49.0
Accounts Receivable [Member] \| Provisional Pricing Arrangements [Member]
Derivatives assets not designated as hedging instruments under ASC 815	49.0
Foreign Exchange Contracts [Member] \| Other Current Liabilities [Member]
Derivatives liabilities designated as hedging instruments under ASC 815	15.9
Derivative Assets [Member]
Derivatives assets designated as hedging instruments under ASC 815	1.2	2.8
Derivatives assets not designated as hedging instruments under ASC 815	121.4	81.8
Total derivatives assets	122.6	84.6
Foreign Exchange Contracts [Member] \| Derivative Liabilities [Member]
Derivatives liabilities designated as hedging instruments under ASC 815
Derivatives liabilities not designated as hedging instruments under ASC 815
Provisional Pricing Arrangements [Member] \| Derivative Liabilities [Member]
Derivatives liabilities not designated as hedging instruments under ASC 815
Customer Supply Agreements [Member] \| Derivative Liabilities [Member]
Derivatives liabilities not designated as hedging instruments under ASC 815
Derivative Liabilities [Member]
Derivatives liabilities designated as hedging instruments under ASC 815	15.9
Derivatives liabilities not designated as hedging instruments under ASC 815
Total derivative liabilities	$ 15.9

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-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.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

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- Definition

Aggregate fair value of all derivative assets designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-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 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

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- Definition

Aggregate fair value of all derivative liabilities designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

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- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-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 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

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- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-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 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

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