Financing Activities - Distributions (Details) - $ / shares	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Distributions (Numeric) [Abstract]
Current quarterly common stock dividend (in dollars per share)	$ 0.4125	$ 0.4125	$ 0.4100	$ 1.2375	$ 1.23
Annualized current quarterly common stock dividend (in dollars per share)	$ 1.65