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Stock-Based Compensation Plans (Details)
3 Months Ended
Mar. 31, 2017
$ / 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 850,422
Awards, Granted | shares 166,339
Awards, Vested | shares (183,164)
Awards, Forfeited | shares (68,678)
Awards, Nonvested at June 30, 2016 | shares 764,919
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 $ 67.25
Weighted Average Grant Date Fair Value, Granted | $ / shares 78.57
Weighted Average Grant Date Fair Value, Vested | $ / shares 68.38
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 68.34
Weighted Average Grant Date Fair Value, Nonvested, June 30, 2016 | $ / shares $ 69.36