Subsequent Events - Equity (Details) - $ / shares	1 Months Ended							3 Months Ended
	Apr. 30, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Mar. 31, 2016	Feb. 29, 2016	Jan. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Equity
Dividends per share declared (in dollars per share)								$ 0.57	$ 0.54
Common Stock
Equity
Dividends per share declared (in dollars per share)		$ 0.19	$ 0.19	$ 0.19	$ 0.18	$ 0.18	$ 0.18
Dividend Payable, April 28, 2017 | Subsequent Event | Common Stock
Equity
Dividends per share declared (in dollars per share)	$ 0.19
Dividend Payable, May 31, 2017 | Subsequent Event | Common Stock
Equity
Dividends per share declared (in dollars per share)	0.19
Dividend Payable, June 30, 2017 | Subsequent Event | Common Stock
Equity
Dividends per share declared (in dollars per share)	$ 0.19