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Debt (Convertible Debenture Terms) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Debt Instruments [Abstract]
Outstanding Principle Amount	$ 1,500.0
Unamortized Debt Discount	536.0
Net Debt Carrying Amount	964.0
Equity Component Carrying Amount	$ 543.6
Conversion rate (shares of common stock per $1,000 of principal amount) as a percent	13.2790
Conversion price (per $1,000 of principal amount) per share	$ 75.3065

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.

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