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Earnings per Share (Details 2) (Class A common stock)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Long-term performance based plans
   
Dilutive securities excluded from computation of earnings per share    
Dilutive securities excluded from computation of earnings per share (in shares) 0.7 0.7
Stock awards
   
Antidilutive Securities Excluded From Computation Of Earnings Per Share    
Anti-dilutive securities excluded from computation of earnings per share (in shares) 0.7 2.1