Debt (Senior Notes) (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long term debt	$ 5,261,029,000	$ 5,168,226,000
Senior Notes
Debt Instrument [Line Items]
Debt instrument fair value	2,610,000,000
Senior Notes \| 2018 Senior Notes
Debt Instrument [Line Items]
Long term debt	826,500,000	818,774,000
Discount on debt	10,300,000	11,000,000
Mark to market adjustment	36,800,000	29,800,000
Senior Notes \| 2020 Senior Notes
Debt Instrument [Line Items]
Long term debt	1,014,020,000	1,014,643,000
Premium on debt	14,000,000	14,600,000
Interest rate swaps \| 2018 Senior Notes
Debt Instrument [Line Items]
Long term debt	500,000,000
Variable interest rate of debt	3.43%
Senior Notes And Senior Convertible Notes
Debt Instrument [Line Items]
Debt instrument fair value		3,150,000,000
Convertible Debt [Member]
Debt Instrument [Line Items]
Debt instrument fair value	987,900,000	1,000,000,000
Convertible Debt [Member] \| Senior Convertible Notes
Debt Instrument [Line Items]
Long term debt	0	593,983,000
Discount on debt		6,000,000
Convertible Debt [Member] \| Cash Convertible Notes
Debt Instrument [Line Items]
Long term debt	914,556,000	937,160,000
Discount on debt	$ 86,500,000	$ 97,800,000

Adjustments to interest rate swap mark to market

No definition available.

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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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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- Definition

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

+ References

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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- Definition

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

+ References

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- Definition

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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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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