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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares
3 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]            
Dividends declared $ 1.4 $ 1.4 $ 1.4 $ 1.3 $ 1.3 $ 1.3