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Per Share Information (Narrative) (Details)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
6.25% Convertible Preferred Stock [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from dilutive common shares calculation 8.6 8.6 8.6 8.6
Restricted Stock Awards [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from dilutive common shares calculation 0.9   0.9