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Consolidated Statement of Changes in Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statement of Stockholders' Equity [Abstract]        
Dividends paid per common stock (in usd per share) $ 0.90 $ 0.90 $ 1.80 $ 1.70