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Stock-Based Compensation Plans (Details)
9 Months Ended
Sep. 30, 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 244,820
Awards, Vested | shares (243,730)
Awards, Forfeited | shares (29,380)
Awards, Nonvested at June 30, 2016 | shares 865,070
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 54.35
Weighted Average Grant Date Fair Value, Vested | $ / shares 58.48
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 73.22
Weighted Average Grant Date Fair Value, Nonvested, June 30, 2016 | $ / shares $ 67.87