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Earnings Per Share (Narrative) (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
0 Months Ended 3 Months Ended 6 Months Ended
Aug. 29, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2011
Earnings Per Share [Line Items]            
Anti-dilutive effect shares   0.8 0.9 2.2 2.2  
Notes conversion price     $ 54.65   $ 54.65  
Date of accelerated repurchase agreement       August 29, 2011    
Amount paid for common stock under accelerated repurchase agreement (in shares) 4          
Payment amount allocated to treasury stock for accelerated share repurchase agreement   $ 346,206,000   $ 346,206,000   $ 136,631,000
Warrants exercise price   $ 68.31 $ 68.31 $ 68.31 $ 68.31  
Bank Of America N.A. [Member]
           
Earnings Per Share [Line Items]            
Amount paid for common stock under accelerated repurchase agreement 209,700,000          
Payment amount allocated to treasury stock for accelerated share repurchase agreement   $ 209,700,000   $ 209,700,000    
Convertible Notes Payable [Member]
           
Earnings Per Share [Line Items]            
Notes conversion price   $ 54.65   $ 54.65    
Convertible Notes Payable [Member] | Warrants [Member]
           
Earnings Per Share [Line Items]            
Warrants exercise price   $ 68.31   $ 68.31