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Shareholders' Equity and Stock-Based Compensation (Details 4) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock option activity, Shares      
Exercised (in shares) (8) (174) (154)
Restricted stock shares and restricted stock units
      
Unvested Restricted Stock shares and Restricted Stock Units      
Outstanding at the beginning of the period (in shares) 1,935 1,440 1,516
Granted (in shares) 652 823 836
Vested (in shares) (754) (264) (636)
Forfeited (in shares) (296) (64) (276)
Outstanding at the end of the period (in shares) 1,537 1,935 1,440
Weighted-Average Grant-Date Fair Value      
Outstanding at the beginning of the period (in dollars per share) $ 54.70 $ 54.38 $ 50.97
Granted (in dollars per share) $ 61.66 $ 50.64 $ 62.72
Vested (in dollars per share) $ 54.34 $ 39.75 $ 51.47
Forfeited (in dollars per share) $ 52.20 $ 57.77 $ 67.21
Outstanding at the end of the period (in dollars per share) $ 58.39 $ 54.70 $ 54.38
Unrecognized compensation cost      
Unrecognized compensation cost related to restricted stock share and restricted stock unit $ 19.8    
Weighted-average period over which unrecognized compensation costs will be recognized 1 year 9 months 18 days    
Stock options
      
Stock option activity, Shares      
Options outstanding and exercisable at the beginning of the period (in shares) 13 364 635
Exercised (in shares) (8) (174) (154)
Terminated (in shares) (5) (177) (117)
Options outstanding and exercisable at the end of the period (in shares)   13 364
Weighted-Average Exercise Price      
Options outstanding and exercisable at the beginning of the period (in dollars per share) $ 62.45 $ 54.87 $ 63.82
Exercised (in dollars per share) $ 50.79 $ 39.58 $ 65.44
Terminated (in dollars per share) $ 85.36 $ 69.42 $ 89.10
Options outstanding and exercisable at the end of the period (in dollars per share)   $ 62.45 $ 54.87
Stock option outstanding and exercisable      
Aggregate intrinsic value of options exercised $ 0.4 $ 5.9 $ 2.5