Stock Repurchase Program

12 Months Ended

Dec. 31, 2012

Stockholders' Equity Note [Abstract]

Treasury Stock

Stock Repurchase Program

In October 2007, our Board of Directors approved a five-year $2,000.0 share repurchase program ("$2.0 billion program") which began in December 2007. The program expired on December 17, 2012. We repurchased approximately 4.8 million shares for $180.8 under the $2.0 billion program through its expiration.