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CONSOLIDATED STATEMENT OF STOCKHOLDERS' DEFICIENCY (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Tax withholdings related to net share settlements of restricted stock units and awards $ 2.4 $ 1.7
Treasury Stock    
Shares withheld for withholding taxes (in shares) 218,757 148,620
Treasury Stock | Restricted Stock and Restricted Stock Units | Class A Common Stock    
Share repurchase price (in dollars per share) $ 11.19 $ 10.98