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Redeemable Preferred Stock (Tables)
12 Months Ended
Dec. 31, 2020
Temporary Equity Disclosure [Abstract]  
Activity Related to Redeemable Preferred Stock
The following table presents a summary of activity related to the redeemable preferred stock for the years ended December 31, 2020 and 2019 (in millions):
December 31,
20202019
Balance at beginning of period$395.0 $359.3 
Dividends accrued (there were no cash dividends declared)
39.5 35.7 
Balance at end of period$434.5 $395.0