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Earnings Per Share (Narrative) (Details)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2012
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Earnings Per Share [Abstract]            
Anti-dilutive effect shares   0.3 0.8 0.3 2.2  
Warrant's exercise price   68.31 68.31 68.31 68.31  
Number of stock repurchase plans           2
Repurchases of common stock, shares 2         6
Stock repurchase plan, shares authorized           8