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Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Business Combination, Step Acquisition [Abstract]    
Net loss attributable to noncontrolling interest, exclusive of impairment $ (1.0)  
Redeemable noncontrolling interest $ 9.0 $ 10.0