Consolidated Statements of Equity (Unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Dividends declared per share (in dollars per share)	$ 1.43	$ 1.30
Dividend equivalents declared per share (in dollars per share)	$ 1.43	$ 1.30