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Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock option exercises/deferred stock unit conversions, shares | 408,563 | 399,224 | 548,238
Stock Redeemed or Called During Period, Shares | 6,000,000 |  |
Stock Issued During Period, Shares, New Issues | 150,000 |  |
Treasury Stock, Shares, Acquired | 206,951 | 716,062 | 1,037,982
Stock Issued During Period, Shares, Treasury Stock Reissued | 140,264 |  |
Preferred Stock, Dividends Per Share, Declared | $ 0.34 | $ 1.34 | $ 1.34
Common Stock, Dividends, Per Share, Cash Paid | $ 2.85 | $ 2.80 | $ 2.58

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