Subsequent Events - Additional Information (Details) - $ / shares									3 Months Ended		9 Months Ended
	Oct. 06, 2020	Jul. 07, 2020	Apr. 06, 2020	Feb. 03, 2020	Oct. 14, 2019	Jul. 09, 2019	Apr. 03, 2019	Feb. 04, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Subsequent Events [Abstract]
Dividends payable, date declared	Oct. 06, 2020	Jul. 07, 2020	Apr. 06, 2020	Feb. 03, 2020	Oct. 14, 2019	Jul. 09, 2019	Apr. 03, 2019	Feb. 04, 2019
Dividends declared per share (in dollars per share)	$ 0.34								$ 0.48	$ 0.48	$ 1.44	$ 1.44
Dividends payable, date to be paid	Oct. 23, 2020	Jul. 24, 2020	Apr. 24, 2020	Feb. 21, 2020	Nov. 01, 2019	Jul. 26, 2019	Apr. 22, 2019	Feb. 22, 2019
Dividends payable, date of record	Oct. 16, 2020	Jul. 17, 2020	Apr. 17, 2020	Feb. 14, 2020	Oct. 25, 2019	Jul. 19, 2019	Apr. 15, 2019	Feb. 15, 2019