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Condensed Consolidated Statement of Shareholders' Equity Consolidated Statement of Shareholders Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]        
Dividends declared per common share $ 1.16 $ 1.01 $ 2.32 $ 2.02