Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Stockholders Equity [Abstract]
Dividends Declared Per Common Share	$ 0.70	$ 0.67	$ 0.67	$ 0.67	$ 0.67	$ 0.67	$ 2.04	$ 2.01