Equity and Redeemable Preferred Stock - Narrative (Details) $ / shares in Units, $ in Millions		1 Months Ended		3 Months Ended
	Mar. 31, 2021 d $ / shares	Mar. 31, 2021 $ / shares shares	Jul. 31, 2020 shares	Sep. 30, 2021 USD ($)	Mar. 31, 2021 $ / shares	Jul. 02, 2020 $ / shares
Class of Stock [Line Items]
Preferred stock, accretion of redemption value, period					10 years
Dividends | $				$ 10
Series A Mandatory Convertible Preferred Stock
Class of Stock [Line Items]
Accrued preferred stock dividends | $				$ 7
Series A Mandatory Convertible Preferred Stock | Underwritten Public Offering
Class of Stock [Line Items]
Sale of stock, shares issued (in shares)			2,300,000
Preferred stock, dividend rate, percentage			6.00%
Preferred stock, par value (in usd per share) | $ / shares						$ 0
Series A Mandatory Convertible Preferred Stock | Underwritten Public Offering | Maximum
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion (in shares)			4.6512
Series A Mandatory Convertible Preferred Stock | Underwritten Public Offering | Minimum
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion (in shares)			3.8760
Series B-1 Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock, par value (in usd per share) | $ / shares	$ 0	$ 0			$ 0
Trading days | d	20
Shares issued (in shares)		75,000
Debt instrument conversion, conversion price per share (in usd per share) | $ / shares	$ 85	$ 85			$ 85
Common stock , conversion, if volume weighted average price, percentage exceeds applicable conversion price	150.00%
Consecutive trading days | d	30
Default on payment obligation, cure period	30 days
Default on payment obligation, dividend rate, quarterly increase, percentage	2.00%
Series B-1 Convertible Preferred Stock | Maximum
Class of Stock [Line Items]
Preferred stock, default on payment obligation, dividend rate, percentage	14.00%
Series B-1 Convertible Preferred Stock | Minimum
Class of Stock [Line Items]
Preferred stock, default on payment obligation, dividend rate, percentage	8.00%