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Stock-Based Compensation Plans - Summary of the Restricted Stock Awards (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Awards  
Nonvested (in shares) | shares 702,778
Granted (in shares) | shares 246,721
Vested (in shares) | shares (236,334)
Forfeited (in shares) | shares (31,365)
Nonvested (in shares) | shares 681,800
Weighted Average Grant Date Fair Value  
Nonvested (in dollars per share) | $ / shares $ 68.23
Granted (in dollars per share) | $ / shares 74.09
Vested (in dollars per share) | $ / shares 64.38
Forfeited (in dollars per share) | $ / shares 69.71
Nonvested (in dollars per share) | $ / shares $ 71.60