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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. Fair value of convertible debt at the balance sheet date.

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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.

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Description of the conversion terms of a debt instrument which may include the conversion ratio (including all potential conversion ratios if contingently adjustable), type of debt or equity security into which the debt is convertible, the dollars of debt or the number of shares into which the instrument is convertible (or potentially convertible into), the conversion period, any contingencies associated with the conversion terms, and the existence and amount of a beneficial conversion feature.

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Interest rate stated in the contractual debt agreement.

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Date when the debt instrument was issued, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

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Contracts and securities that allow the holder to buy common stock from the entity. A call option that gives the holder the right, but not the obligation, to purchase shares of common stock from the entity in accordance with an agreement upon payment of a specified amount. A warrant is a security that gives the holder the right to purchase common stock in accordance with the terms of the instrument, usually upon payment of a specified amount. The dilutive effect of which is reflected in diluted EPS by application of the treasury stock method unless another method is required to be applied.

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Aggregate notional amount of all derivatives designated as cash flow hedging instruments. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.

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The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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Convertible Debt - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2006	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Issuance date	11/13/2006
Proceed from issuance of senior unsecured obligations	$ 3,450.0
Debt Instrument Convertible Terms Of Conversion Feature	(1) during the five business-day period after any five consecutive trading-day period (the “measurement period”) in which the price per Note for each day of that measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate on each such day; (2) during any calendar quarter, if the last reported sale price of our common stock for 20 or more trading days in a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter exceeds 130% of the applicable conversion price in effect on the last trading day of the immediately preceding calendar quarter; or (3) upon the occurrence of certain events specified in the Notes. Additionally, the 2013 Notes will become convertible during the last three months prior to their maturity.
Shares of our common stock converted per one thousand dollars of principal amount of Notes	62.1978
Conversion premium	27.50%
Conversion price	$ 16.08
Conversion premium based on the closing price	55.00%
Closing price per share	$ 12.61
Convertible debt, converted amount				24.2
Convertible debt, carrying amount		3,425.8		3,425.8
Convertible debt, fair value		4,707.6		4,707.6
Carrying amount of the equity component		524.2		524.2
Semi annual Interest rate		1.75%		1.75%
Debt Instrument Frequency Of Periodic Payment		Semi-annually
Debt Instrument, unamortized discount on 2011 Notes		10.8		10.8
Debt Instrument, unamortized discount on 2013 Notes		134.4		134.4
Effective interest rate		5.60%	5.60%	5.60%	5.60%
Aggregate notional amount of interest rate swap contracts designated as cash flow hedges						900.0
Lower Limit \| Group 1 \| Sold Warrants
Expiration date for the purchased options	Feb. 15, 2012
Lower Limit \| Group 2 \| Sold Warrants
Expiration date for the purchased options	Feb. 18, 2014
Upper Limit \| Group 1 \| Sold Warrants
Expiration date for the purchased options	Mar. 15, 2012
Upper Limit \| Group 2 \| Sold Warrants
Expiration date for the purchased options	Mar. 18, 2014
Group 1 \| Purchased Options
Number of common stock , subject to customary anti-dilution adjustments	215,000,000
Group 2 \| Purchased Options
Expiration date for the purchased options	Dec. 01, 2011
Convertible Notes 1 Point 75 Percent Due 2011
Semi annual Interest rate		1.75%		1.75%
Debt amortization period, text block		will be fully amortized by December 31, 2011		will be fully amortized by December 31, 2011
Convertible Notes 1 Point 75 Percent Due 2013
Debt Instrument Convertible Latest Date	9/1/2013
Semi annual Interest rate		1.75%		1.75%
Debt amortization period, text block		will be fully amortized by December 31, 2013		will be fully amortized by December 31, 2013
Semi Annual Payment, First Payment
Interest rate payment dates		December 1
Semi Annual Payment, Second Payment
Interest rate payment dates		June 1
Purchased Options
Expiration date for the purchased options	Dec. 01, 2013
Payment for Notes	669.1
Sold Warrants
Number of common stock , subject to customary anti-dilution adjustments	215,000,000
Common stock at an exercise price	$ 19.55
Proceeds from the sale of the warrants	$ 391.1