Common Stock and Preferred Stock - At-the-Market Offering Program Narrative (Details) - USD ($)	2 Months Ended	5 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2020	Jul. 22, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common stock, value, issued		$ 10,000	$ 10,000		$ 7,000
At-The-Market Offering Program
Class of Stock [Line Items]
Shares available for sale (in shares)				9,000,000
Number of shares sold (in shares)	9,000,000		9,000,000
Consideration received on sale of shares		156,700,000
Payments of stock issuance costs		5,000,000.0
Common stock, value, issued		$ 900	$ 900