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Condensed Consolidated Statement of Shareholders' Equity Consolidated Statement of Shareholders Equity (Parenthetical) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement of Stockholders' Equity [Abstract]        
Dividends declared per common share $ 2.41 $ 2.17 $ 4.73 $ 4.19