Capital Stock	12 Months Ended
Dec. 31, 2011
Stockholders' Equity Note [Abstract]
Capital Stock	8. CAPITAL STOCK Stock Repurchase Programs The Company’s Board of Directors authorized an ongoing stock repurchase program with a total repurchase authority granted to the Company of $3.0 billion. The Company may use the approved dollar authority to repurchase stock at any time until the approved amount is exhausted. The objective of the Company’s stock repurchase program is to improve stockholders’ returns. At December 31, 2011, approximately $186.6 million was available to repurchase common stock pursuant to the stock repurchase program. All shares repurchased are recorded as treasury stock in the Company's consolidated balance sheets. A portion of the funds used to repurchase stock over the course of the program was provided by proceeds from employee stock option exercises and the related tax benefit. The Company is authorized to make open market purchases of its common stock using general corporate funds. Additionally, from time to time, the Company may enter into structured stock repurchase arrangements with large financial institutions using general corporate funds in order to lower the average cost to acquire shares. These programs include terms that require the Company to make up-front payments to the counterparty financial institution and result in the receipt of stock during or at the end of the term of the agreement or the receipt of either stock or cash at the maturity of the agreement, depending on market conditions. During the year ended December 31, 2011, the Company expended approximately $424.8 million on open market purchases, repurchasing 6,275,470 shares of outstanding common stock at an average price of $67.70. As of December 31, 2011, the Company did not have any prepaid notional amounts outstanding under structured stock repurchase programs and during the year it did not make any up-front payments to financial institutions related to structured stock repurchase agreements. During the year ended December 31, 2010, the Company expended approximately $434.8 million on open market purchases, repurchasing 8,157,400 shares of outstanding common stock at an average price of $53.31. In addition, during the third quarter of 2010, the Company made an up-front payment of $15.0 million to a financial institution related to a structured stock repurchase agreement. At the maturity of the agreement in the fourth quarter of 2010, the Company received $16.1 million in cash, including premiums, and did not take delivery of any shares related to the agreement due to market conditions. As of December 31, 2010, the Company did not have any prepaid notional amounts outstanding relating to its structured stock repurchase programs. During the year ended December 31, 2009, the Company expended approximately $214.9 million on open market purchases, repurchasing 6,475,830 shares of outstanding common stock at an average price of $33.19. As of December 31, 2009, the Company did not have any prepaid notional amounts outstanding under its structured stock repurchase programs and during the year it did not make any up-front payments to financial institutions related to structured stock repurchase agreements. Shares for Tax Withholding During the years ended December 31, 2011, 2010 and 2009, the Company withheld 182,203 shares, 123,489 shares and 46,732 shares, respectively, from stock units that vested. Amounts withheld to satisfy minimum tax withholding obligations that arose on the vesting of stock units was $13.3 million, $6.3 million and $1.8 million, for 2011, 2010 and 2009, respectively. These shares are reflected as treasury stock in the Company's consolidated balance sheets and statement of equity and the related cash outlays reduce the Company's total stock repurchase authority. Preferred Stock The Company is authorized to issue 5,000,000 shares of preferred stock, $0.01 par value per share. No shares of such preferred stock were issued and outstanding at December 31, 2011 or 2010.

8. CAPITAL STOCK

Stock Repurchase Programs

The Company’s Board of Directors authorized an ongoing stock repurchase program with a total repurchase authority granted to the Company of $3.0 billion. The Company may use the approved dollar authority to repurchase stock at any time until the approved amount is exhausted. The objective of the Company’s stock repurchase program is to improve stockholders’ returns. At December 31, 2011, approximately $186.6 million was available to repurchase common stock pursuant to the stock repurchase program. All shares repurchased are recorded as treasury stock in the Company's consolidated balance sheets. A portion of the funds used to repurchase stock over the course of the program was provided by proceeds from employee stock option exercises and the related tax benefit.

The Company is authorized to make open market purchases of its common stock using general corporate funds. Additionally, from time to time, the Company may enter into structured stock repurchase arrangements with large financial institutions using general corporate funds in order to lower the average cost to acquire shares. These programs include terms that require the Company to make up-front payments to the counterparty financial institution and result in the receipt of stock during or at the end of the term of the agreement or the receipt of either stock or cash at the maturity of the agreement, depending on market conditions.

During the year ended December 31, 2011, the Company expended approximately $424.8 million on open market purchases, repurchasing 6,275,470 shares of outstanding common stock at an average price of $67.70. As of December 31, 2011, the Company did not have any prepaid notional amounts outstanding under structured stock repurchase programs and during the year it did not make any up-front payments to financial institutions related to structured stock repurchase agreements.

During the year ended December 31, 2010, the Company expended approximately $434.8 million on open market purchases, repurchasing 8,157,400 shares of outstanding common stock at an average price of $53.31. In addition, during the third quarter of 2010, the Company made an up-front payment of $15.0 million to a financial institution related to a structured stock repurchase agreement. At the maturity of the agreement in the fourth quarter of 2010, the Company received $16.1 million in cash, including premiums, and did not take delivery of any shares related to the agreement due to market conditions. As of December 31, 2010, the Company did not have any prepaid notional amounts outstanding relating to its structured stock repurchase programs.

During the year ended December 31, 2009, the Company expended approximately $214.9 million on open market purchases, repurchasing 6,475,830 shares of outstanding common stock at an average price of $33.19. As of December 31, 2009, the Company did not have any prepaid notional amounts outstanding under its structured stock repurchase programs and during the year it did not make any up-front payments to financial institutions related to structured stock repurchase agreements.

Shares for Tax Withholding

During the years ended December 31, 2011, 2010 and 2009, the Company withheld 182,203 shares, 123,489 shares and 46,732 shares, respectively, from stock units that vested. Amounts withheld to satisfy minimum tax withholding obligations that arose on the vesting of stock units was $13.3 million, $6.3 million and $1.8 million, for 2011, 2010 and 2009, respectively. These shares are reflected as treasury stock in the Company's consolidated balance sheets and statement of equity and the related cash outlays reduce the Company's total stock repurchase authority.

Preferred Stock

The Company is authorized to issue 5,000,000 shares of preferred stock, $0.01 par value per share. No shares of such preferred stock were issued and outstanding at December 31, 2011 or 2010.