Preferred Stock (Details) $ / shares in Units, $ in Millions	1 Months Ended
	Oct. 31, 2021 USD ($)	Aug. 31, 2021 USD ($)	May 31, 2021 shares	Sep. 30, 2021 $ / shares shares	Dec. 31, 2020 shares
Class of Stock [Line Items]
Preferred stock dividends accumulated | $		$ 9
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares				$ 1,000
Preferred stock, convertible, conversion rate (in shares)				44.9585
Preferred stock, shares authorized (in shares) | shares			200,000	20,000,000	20,000,000
Subsequent Event
Class of Stock [Line Items]
Preferred stock dividends declared amount | $	$ 10
Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock, dividend rate			6.50%
Convertible Preferred Stock | Private Placement
Class of Stock [Line Items]
Number of shares of Series A, cumulative convertible preferred stock | shares			600,000