Consolidated Statements of Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Stock Transactions, Parenthetical Disclosures [Abstract]
Dividends on common stock, per common share	$ 0.35	$ 0.295	$ 0.940434953749262	$ 0.885
Repurchases of shares of common stock (in shares)	780,716	477,804	1,453,908	3,195,126
Series B Preferred Stock
Stock Transactions, Parenthetical Disclosures [Abstract]
Dividends on preferred stock				6.45%
Series C Preferred Stock
Stock Transactions, Parenthetical Disclosures [Abstract]
Dividends on preferred stock	5.70%	5.70%	5.70%	5.70%