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Share-Based Compensation Arrangements	9 Months Ended
Share-Based Compensation Arrangements	Sep. 30, 2019
Share-based Payment Arrangement [Abstract]
Share-Based Compensation Arrangements	Share-Based Compensation Arrangements During the nine months ended September 30, 2019, the Corporation granted performance share unit awards and nonvested share unit awards. Performance share awards were granted to certain executive and non-executive officers to provide them with the opportunity to earn shares of common stock of the Corporation. The performance share awards were valued at fair market value as determined by the closing price of the Corporation’s common stock on the award date. The weighted average fair value of the performance share awards was $52.83. The number of shares to be vested will be contingent upon the Corporation’s attainment of certain performance measures as detailed in the performance share award agreements. The performance share awards will earned over a 3-year performance period and the current performance assumption results in 43,360 shares being earned. The Corporation granted to non-executive officers and directors 10,870 nonvested share units, with 3-year cliff vesting. The weighted average grant date fair value of the nonvested share units was $51.43.