Consolidated Statements of Equity (Parenthetical) - $ / shares			3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 28, 2016	Mar. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (usd per share)	$ 0.15	$ 0.08	$ 0.15	$ 0.55	$ 0.45	$ 1.18	$ 1.83