v2.4.0.6

Convertible Note Hedge and Warrant Transactions (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended					12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2010 Convertible Note Call Options [Member]	Sep. 30, 2010 Convertible Note Call Options [Member]	Dec. 31, 2010 Convertible Note Warrants [Member]	Sep. 30, 2010 Convertible Note Warrants [Member]
Forward Contract Indexed to Issuer's Equity [Line Items]
Option Indexed to Issuer's Equity, Indexed Shares					40.1
Option Indexed to Issuer's Equity, Strike Price				$ 8.61		$ 11.59
Forward Contract Indexed to Issuer's Equity, Indexed Shares							40.1
Purchase of call options	$ 0	$ 0	$ 69.0
Proceeds from Issuance of Warrants	0	0	32.7
Proceeds from settlement of call options	0	369.5	0
Payments for Repurchase of Warrants	0	298.4	0
Adjustments To Additional Paid In Capital Settlement Of Options and Warrants, Net		$ 71.1

X

- Definition

Adjustments To Additional Paid In Capital Settlement Of Options and Warrants, Net

+ References

No definition available.

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- Definition

The aggregate amount received by the entity to settle the right to purchase the entity's equity shares at a predetermined price.

+ References

No definition available.

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- Definition

The aggregate amount paid by the entity to acquire the right to purchase the entity's equity shares at a predetermined price.

+ References

No definition available.

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- Definition

The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 4

-Section 08

-Paragraph i

-Subparagraph 2



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(2))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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- Definition

The number of issuer's shares to which the option contract is indexed.

+ References

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

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 00-19

-Paragraph 50

-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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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The exercise (or strike) price stated in the contract. The fixed price at which the option holder can purchase, in the case of a call option, or sell, in the case of a put option, on the underlying security.

+ References

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-Publisher FASB

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-Number 00-19

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-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

The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt.

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-Publisher FASB

-Name Accounting Standards Codification

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-Glossary Financing Activities

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- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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