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UNAUDITED CONSOLIDATED STATEMENT OF STOCKHOLDERS' DEFICIENCY (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Tax withholdings related to net share settlements of restricted stock units and awards $ 0.0 $ 0.1 $ 1.6 $ 3.6
Restricted Stock and Restricted Stock Units        
Shares withheld for withholding taxes (in shares) 0 5,493 85,607 167,297
Restricted Stock and Restricted Stock Units | Treasury Stock | Class A Common Stock        
Share repurchase price (in usd per share) $ 0.00 $ 15.60 $ 18.86 $ 21.42