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Redeemable Preferred Stock - Redeemable Preferred Stock Activity (Details)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Increase (Decrease) in Temporary Equity [Roll Forward]  
Beginning balance $ 434.5
Dividends declared (5.1)
Redeemable preferred stock conversion to common stock (439.7)
Ending balance 0.0
Series A Preferred Stock  
Increase (Decrease) in Temporary Equity [Roll Forward]  
Beginning balance 434.5
Dividends accrued 10.3
Ending balance $ 0.0