Consolidated Statements of Equity (Parenthetical) - $ / shares	3 Months Ended				12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Dividends per share (in dollars per share)	$ 0.59	$ 0.59	$ 0.59	$ 0.59	$ 2.36	$ 2.21	$ 2.08