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Condensed Consolidated Statements of Changes in Common Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dividends per share (in dollars per share) $ 1.30 $ 1.07 $ 3.78 $ 3.11