Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	1 Months Ended				3 Months Ended
	Oct. 31, 2019	Aug. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Common stock, dividends declared per share (in usd per share)	$ 1.45	$ 1.45	$ 1.45	$ 1.45	$ 1.45	$ 1.45	$ 1.32	$ 1.32