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Convertible Senior Notes (Warrants) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]
Proceeds from sale of warrants	$ 38.4
Shares exercisable upon conversion	9,800,000
Strike price	$ 34.20
Dilutive effect of warrants	107,263

- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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