CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares	3 Months Ended							12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends to common stockholders, per share (in dollars per share)	$ 0.4500	$ 0.4500	$ 0.7925	$ 0.7925	$ 0.7925	$ 0.7925	$ 0.7925	$ 2.14250	$ 3.17000	$ 3.16250