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Per Share Information (Narrative) (Details)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 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 calculation8.38.68.38.6
Restricted Stock Awards [Member]
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from dilutive common shares calculation0.9 0.9