CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]
Dividends per common share declared (in dollars per share)	$ 0.68	$ 2.72	$ 2.72	$ 2.72