CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	1 Months Ended	3 Months Ended								9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018
Statement of Stockholders' Equity [Abstract]
Common stock dividends declared (in dollars per share)	$ 0.78	$ 0.78	$ 0.70	$ 0.70	$ 0.70	$ 0.7	$ 0.60	$ 0.60	$ 0.60	$ 2.18	$ 1.90