UNAUDITED CONSOLIDATED STATEMENT OF STOCKHOLDERS' DEFICIENCY (Parenthetical) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Tax withholdings related to net share settlements of restricted stock units and awards	$ 2.4	$ 0.4
Treasury Stock
Shares withheld for withholding taxes (in shares)	162,496	14,977
Restricted Stock and Restricted Stock Units \| Treasury Stock \| Class A Common Stock
Share repurchase price (in dollars per share)	$ 14.95	$ 23.47

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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