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Redeemable Preferred Stock (Tables)
9 Months Ended
Sep. 30, 2021
Temporary Equity Disclosure [Abstract]  
Schedule of Activity Related to Redeemable Preferred Stock
A summary of activity related to the Series A Preferred Stock follows (in millions):
Balance at December 31, 2020$434.5 
Dividends accrued10.3 
Dividends declared(5.1)
Redeemable preferred stock conversion to common stock(439.7)
Balance at September 30, 2021$—