v2.4.0.6
Stockholder's Equity (Details) (USD $)
 1 Months Ended 2 Months Ended 12 Months Ended
Feb. 13, 2013
Feb. 16, 2012
Feb. 17, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Common Stock Activity [Abstract]              
Shares of Common Stock Sold       13,570,000      
Public Offering Price of Common Stock Sold       $ 105.50      
Common Stock, Par (in dollars per share)       $ 0.01 $ 0.01    
Proceeds From Issuance Or Sale Of Equity       $ 1,388,000,000      
An aggregate maximum of shares of common stock authorized for repurchase       10,000,000      
Remaining shares available for purchase under share repurchase authorization       6,386,200      
Dividends Common Stock Cash $ 0.1875 $ 0.17 $ 0.16        
Common Stock Issued Under Equity Compensation Plans       2,471,000 1,395,000 1,482,000  
Treasury Stock Purchased       (575,000) (267,000) (115,000)  
Common Stock Issued Under Employee Stock Purchase Plan       164,000 135,000 114,000  
Treasury Stock Issued Under Other Equity Compensation Plans       553,000 109,000 87,000  
Common Stock Sold         13,570,000    
Common Shares Issued       271,958,495 269,323,084 254,223,000 252,627,000
Treasury Shares Outstanding       (326,264) (303,633) (146,000) (118,000)
Common Shares Outstanding       271,632,000 269,019,000 254,077,000 252,509,000
Series E Junior Participating Preferred Stock (Series E) Authorized       1,500,000      
Series E Junior Participating Preferred Stock (Series E) Authorized, total, following two-for-one stock split       3,000,000