Subsequent Events - Equity (Details) - $ / shares	1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 31, 2016	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Equity
Dividends per share declared (in dollars per share)			$ 0.54	$ 0.51	$ 1.62	$ 1.53
Dividend Declared | Common Stock
Equity
Dividends per share declared (in dollars per share)		$ 0.18
Dividend Declared | Subsequent Event | Common Stock
Equity
Per share percentage increase in dividends declared	5.60%
Dividend Payable, October 31, 2016 | Subsequent Event | Common Stock
Equity
Dividends per share declared (in dollars per share)	$ 0.19
Dividend Payable, November 30, 2016 | Subsequent Event | Common Stock
Equity
Dividends per share declared (in dollars per share)	0.19
Dividend Payable, December 31, 2016 | Subsequent Event | Common Stock
Equity
Dividends per share declared (in dollars per share)	$ 0.19