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Redeemable Preferred Stock (Tables)
9 Months Ended
Sep. 30, 2020
Temporary Equity Disclosure [Abstract]  
Activity Related to Redeemable Preferred Stock
A summary of activity related to the Series A Preferred Stock follows (in millions):
Balance at December 31, 2019$395.0 
Dividends accrued (there were no cash dividends declared)
29.2 
Balance at September 30, 2020$424.2