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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 Dividend | Mar. 31, 2019 Dividend | Mar. 31, 2018 Dividend | Dec. 31, 2020 $ / shares | [1] | Dec. 31, 2019 $ / shares | [1] | Dec. 31, 2018 $ / shares
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |
Dividends declared per common share (in USD per share) | $ / shares |  |  |  | $ 1.75 | $ 1.71 | $ 1.66
Number of dividends declared per quarter | Dividend | 2 | 2 | 2 |  |  |
[1] | * Two dividends were declared in each of the first quarters of 2020, 2019 and 2018.

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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