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Stockholders' Deficit - Dividends Declared and Paid per Share (Details) - $ / shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Equity [Abstract]    
Dividends declared per common share (USD per share) $ 0 $ 0.76
Dividends paid per common share (USD per share) $ 0 $ 0.69