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Stock-Based Compensation Plans (Details)
3 Months Ended
Mar. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Awards, Nonvested at December 31, 2015 | shares 893,360
Awards, Granted | shares 193,070
Awards, Vested | shares (185,220)
Awards, Forfeited | shares (5,780)
Awards, Nonvested at March 31, 2016 | shares 895,430
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Nonvested, December 31, 2015 | $ / shares $ 69.16
Weighted Average Grant Date Fair Value, Granted | $ / shares 52.69
Weighted Average Grant Date Fair Value, Vested | $ / shares 56.51
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 77.32
Weighted Average Grant Date Fair Value, Nonvested, March 31, 2016 | $ / shares $ 68.17