Derivative Instuments (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2011 year day	Sep. 30, 2010	Dec. 31, 2010
Interest Rate Risk
Cash and Short-Term Deposits, Average Interest Rate	1.00%
Convertible Bonds, Fixed Interest Rate	2.75%
Convertible Bond, Principal Amount	$ 1,100.0
Credit Risk
Entity-Wide Revenue, Major Customer, USA, Percent			44.00%
Foreign Exchange Risk
Swap and Foreign Exchange Contract, Number Outstanding	26
Swap and Forward Contract, Days-to-Maturity, Maximum	90
Foreign Currency Contract, Asset, Fair Value Disclosure	5.6		3.7
Foreign Currency Contracts, Liability, Fair Value Disclosure	2.3		2.7
Foreign Exchange Contract, Gain (Loss), Net	$ 10.5	$ (21.3)

Average interest rate received on cash and liquid investments.

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- Definition

Percentage of revenues for the major customers in the USA over total revenues to consolidated external customers.

+ Details

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- Definition

Maximum number of days to maturity for swaps and forward contracts.

+ Details

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- Details

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- Definition

The effective interest rate on the liability component of convertible debt instrument which may be settled in cash upon conversion, including partial cash settlement.

+ References

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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number APB14-1

-Paragraph 33

-Subparagraph a

+ Details

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

+ Details

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- Definition

Net gain (loss) included in earnings for the period from the net change in fair value of derivative instrument not designated as hedging instrument.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(1)(b)

+ Details

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ Details

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date.

+ Details

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Balance Type:	debit
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- Definition

+ Details

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- Details

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- Details

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