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Consolidated Statements of Equity (unaudited) (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Common stock dividends:        
Dividends on common stock (in dollars per share) $ 0.98 $ 0.9 $ 1.96 $ 1.8