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Share-Based Compensation Arrangements	3 Months Ended
Share-Based Compensation Arrangements	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Share-Based Compensation Arrangements	Share-Based Compensation Arrangements During the three months ended March 31, 2021, the Corporation granted performance share unit awards and nonvested share unit awards. The Corporation granted performance share unit awards to certain key employees providing the opportunity to earn shares of common stock over a 3-year performance period. The weighted average fair value of the performance share unit awards was $46.15. 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. Based on the most recent performance assumption available, it is estimated that 51,156 shares will be earned. The Corporation granted to certain key employees 1,760 nonvested share units with 3-year cliff vesting. The weighted average grant date fair value of the nonvested share units was $46.15.