Debt (Cash Convertible Notes) (Details) (USD $)	0 Months Ended	6 Months Ended
Sep. 15, 2008	Jun. 30, 2012 D	Dec. 31, 2011
Debt Instrument [Line Items]
Long term debt		$ 5,261,029,000	$ 5,168,226,000
Debt instrument, maturity date		Sep. 15, 2015
Convertible Debt
Debt Instrument [Line Items]
Debt instrument fair value		987,900,000	1,000,000,000
Convertible Debt \| Cash Convertible Notes
Debt Instrument [Line Items]
Long term debt		914,556,000	937,160,000
Debt		488,500,000	477,200,000
Face amount of debt	575,000,000	575,000,000	575,000,000
Discount on debt		86,500,000	97,800,000
Convertible debt instrument, carrying amount of the equity component		426,100,000	460,000,000
Debt instrument, maturity date	Sep. 15, 2015
Trading days		20
Consecutive trading days		30
Ratio of observed share price to conversion reference price		130.00%
Conversion reference price of notes		$ 13.32
Reference principal amount of cash convertible notes		1,000
Initial conversion reference rate, per $1,000 principal amount of notes		75.0751
Call Options \| Cash Convertible Notes
Debt Instrument [Line Items]
Convertible debt instrument, fair value of associated derivative transaction		$ 426,100,000	$ 460,000,000

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- Definition

Ratio Of Observed Share Price To Conversion Reference Price

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- Definition

Reference principal amount of Cash Convertible Notes to which the ratio is applied to the debt for purposes of determining the number of shares of the equity security into which the debt will be converted.

+ References

No definition available.

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- Definition

Trading Days

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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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The price per share of the conversion feature embedded in the debt instrument.

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The ratio applied to the debt for purposes of determining the number of shares of the equity security into which the debt will be converted.

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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.

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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.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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No definition available.

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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