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Redeemable Preferred Stock (Tables)
12 Months Ended
Dec. 31, 2021
Temporary Equity Disclosure [Abstract]  
Schedule of 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, 2021 and 2020 (in millions):
December 31,
20212020
Balance at beginning of period$434.5 $395.0 
Dividends accrued10.3 39.5 
Dividends declared(5.1)— 
Redeemable preferred stock conversion to common stock(439.7)— 
Balance at end of period$— $434.5