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Stock-Based Compensation Plans (Details) (USD $)
6 Months Ended
Dec. 31, 2013
Jun. 30, 2014
Restricted Stock [Member]
Jun. 30, 2014
Restricted Stock [Member]
Restricted Stock Awards      
Awards, Nonvested at December 31, 2012 933,740 993,905  
Weighted Average Grant Date Fair Value, Nonvested, December 31, 2011 $ 49.87   $ 54.39
Awards, Granted   249,440  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 66.28  
Awards, Vested   (148,965)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   $ 46.71  
Awards, Forfeited   (40,310)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value   $ 51.52