Accelerated Share Repurchase	9 Months Ended
Accelerated Share Repurchase	Sep. 30, 2012
Payments for Repurchase of Equity [Abstract]
Accelerated Share Repurchase	Accelerated Share Repurchase In December 2011, the Company entered into an agreement to repurchase shares of its common stock under an accelerated share repurchase program. Pursuant to the agreement, the Company initially purchased 2,771,004 shares for $100. In April 2012, the Company received an additional 4,653 shares based on its volume-weighted average stock price during the term of the transaction. In July 2012, the Company entered into an agreement to repurchase shares of its common stock under an accelerated repurchase program. Pursuant to the agreement, the Company initially purchased 5,016,190 shares for $200. The actual number of shares repurchased will be based on the volume-weighted average share price of the Company's stock during the term of the transaction subject to provisions that establish a minimum number of shares to be repurchased.

Tabular disclosure of accelerated share repurchase (ASR) programs. An ASR is a combination of transactions that permits an entity to purchase a targeted number of shares immediately with the final purchase price of those shares determined by an average market price over a fixed period of time. An accelerated share repurchase program is intended to combine the immediate share retirement benefits of a tender offer with the market impact and pricing benefits of a disciplined daily open market stock repurchase program. ASRs can be disclosed as part of stockholders' equity.

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