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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 $ / shares | Mar. 31, 2021 Dividend | Sep. 30, 2020 $ / shares | [1] | Mar. 31, 2020 Dividend | Sep. 30, 2021 $ / shares | [1] | Sep. 30, 2020 $ / shares | [1]
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ / shares | $ 0.45 |  | $ 0.44 |  | $ 1.79 | $ 1.75
Number of dividends declared per quarter | Dividend |  | 2 |  | 2 |  |
[1] | Two dividends were declared in each of the first quarters of 2021 and 2020.

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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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