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8.00% Series A Convertible Preferred Stock (Tables)
9 Months Ended
Sep. 30, 2021
Temporary Equity Disclosure [Abstract]  
Summary of Preferred Stock Activity
The following table summarizes the preferred stock activity for the nine months ended September 30, 2021 (in millions, except per share data):

Preferred Stock
Shares Issued and OutstandingCarrying Value
Balance at December 31, 2020288,497 $251.5 
Dividends paid/accrued dividends5,769 — 
Conversion of preferred stock(294,266)(251.5)
Balance at September 30, 2021— $—