Debt (Senior Notes) (Narrative) (Details) (USD $)	1 Months Ended
Sep. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long term debt	$ 4,941,764,000	$ 5,168,226,000
Senior Notes
Debt Instrument [Line Items]
Debt instrument fair value	2,600,000,000
Senior Notes \| 2020 Senior Notes
Debt Instrument [Line Items]
Long term debt	1,013,697,000	1,014,643,000
Premium on debt	13,700,000	14,600,000
Senior Notes \| 2018 Senior Notes
Debt Instrument [Line Items]
Long term debt	836,657,000	818,774,000
Fair value adjustment	46,700,000	29,800,000
Discount on debt	10,000,000	11,000,000
Interest rate swaps \| 2018 Senior Notes
Debt Instrument [Line Items]
Long term debt	500,000,000
Variable interest rate of debt	3.39%
Senior Notes And Senior Convertible Notes
Debt Instrument [Line Items]
Debt instrument fair value		3,150,000,000
Convertible Debt [Member] \| Cash Convertible Notes
Debt Instrument [Line Items]
Long term debt	1,019,108,000	937,160,000
Discount on debt	80,700,000	97,800,000
Debt instrument fair value	$ 1,100,000,000	$ 1,000,000,000

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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

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- Definition

The effective interest rate at the end of the reporting period.

+ References

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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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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

Adjustment to the amount at which a liability incurred or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale.

+ References

No definition available.

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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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