Distributions Paid and Payable (Details) - $ / shares	1 Months Ended																			9 Months Ended
	Oct. 31, 2021	Sep. 30, 2021	Aug. 31, 2021	Jul. 31, 2021	Jun. 30, 2021	May 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Feb. 28, 2021	Jan. 31, 2021	Sep. 30, 2020	Aug. 31, 2020	Jul. 31, 2020	Jun. 30, 2020	May 31, 2020	Apr. 30, 2020	Mar. 31, 2020	Feb. 29, 2020	Jan. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Distributions Paid and Payable
Distributions paid per common share (in dollars per share)		$ 0.2355	$ 0.2355	$ 0.2355	$ 0.2350	$ 0.2350	$ 0.2350	$ 0.2345	$ 0.2345	$ 0.2345	$ 0.2335	$ 0.2335	$ 0.2335	$ 0.2330	$ 0.2330	$ 0.2330	$ 0.2325	$ 0.2325	$ 0.2275	$ 2.1150	$ 2.0920
Distributions payable (in dollars per share)		$ 0.2360																		$ 0.2360
Subsequent event
Distributions Paid and Payable
Distributions paid per common share (in dollars per share)	$ 0.2360