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Series A Convertible Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 04, 2015
Mar. 31, 2022
Dec. 31, 2021
Class of Stock [Line Items]      
Temporary Equity, Shares Issued   300,000 300,000
Series A Convertible Preferred Stock      
Class of Stock [Line Items]      
Dividend rate 5.50%    
Dividend rate for preferred shares; accrued but unpaid dividend 8.00%    
Dividends, Preferred Stock, Cash   $ 4  
Conversion price per share at option of holder (in dollars per share) $ 30.00    
Conversion rate per preferred share (in shares) 33.333    
Financial instruments subject to redemption, settlement terms, maximum number of shares (in shares)   9,200,000