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Share-Based Compensation (Details 2) (Restricted stock [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Restricted stock [Member]
 
Restricted Stock  
Unvested units at the beginning of the period (in shares) 0.5
Units vested (in shares) (0.1)
Units forfeited (in shares) 0
Unvested units at the end of the period (in shares) 0.4
Weighted Average Grant Date Value  
Unvested units at the beginning of the period (in dollars per share) $ 176.38
Units vested (in dollars per share) $ 121.94
Units forfeited (in dollars per share) $ 94.83
Unvested units at the end of the period (in dollars per share) $ 182.44