Consolidated Statements of Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Dividends per share (in dollars per share)	$ 1.50	$ 1.34	$ 2.84	$ 2.50