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Shareholders' Equity (Narrative) (Details) (USD $)
 1 Months Ended 12 Months Ended
Feb. 28, 2006
Oct. 31, 2005
Oct. 31, 2002
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stockholders' Equity Note [Abstract]            
Stock repurchase program, authorized amount $ 200,000,000 $ 100,000,000 $ 100,000,000      
Total stock repurchase authorization       400,000,000    
Shares repurchased under authorized repurchase programs       9,688,900    
Value of shares repurchased under authorized repurchase programs       297,700,000    
Stock Repurchased Under Repurchase Program During Period, Value       0 0 0
Remaining value of stock repurchase programs authorization       102,300,000    
Value of shares repurchased from employees, separate from other authorizations       $ 2,800,000 $ 4,000,000 $ 7,400,000