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Convertible Senior Debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Oct. 31, 2009	Jul. 31, 2011	Jul. 31, 2013
Schedule of convertible senior debt
Convertible senior debt	$ 700,000,000us-gaap_ConvertibleSubordinatedDebt	$ 700,000,000us-gaap_ConvertibleSubordinatedDebt
Convertible Senior Notes [Member]
Schedule of convertible senior debt
Convertible senior debt	700,000,000	700,000,000
Convertible Senior Notes [Member] \| Notes due 2016 [Member]
Schedule of convertible senior debt
Interest rate	5.00%	5.00%	5.00%
Convertible senior debt	50,000,000	50,000,000
Convertible Senior Notes [Member] \| Notes due 2018 [Member]
Schedule of convertible senior debt
Interest rate	4.25%	4.25%		4.25%
Convertible senior debt	350,000,000	350,000,000
Convertible Senior Notes [Member] \| Notes due 2020 [Member]
Schedule of convertible senior debt
Interest rate	3.625%	3.625%			3.625%
Convertible senior debt	$ 300,000,000	$ 300,000,000

Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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