CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Statement Of Stockholders Equity [Abstract]
Dividends declared on common stock (in dollars per share)	$ 0.685	$ 0.65	$ 1.37	$ 1.30
Dividends declared on preferred stock (in dollars per depositary share)	$ 36,875	$ 0.36875	$ 0.7375	$ 0.7375