Consolidated Statements of Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Dividends declared per share (in dollars per share)	$ 0.75	$ 0.68
Dividend equivalents declared per share (in dollars per share)	$ 0.75	$ 0.68