CONSOLIDATED STATEMENT OF STOCKHOLDERS' DEFICIENCY (Parenthetical) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Tax withholdings related to net share settlements of restricted stock units and awards	$ 1.7	$ 1.6
Treasury Stock
Shares withheld for withholding taxes (in shares)	148,620	92,260
Restricted Stock and Restricted Stock Units \| Treasury Stock \| Class A Common Stock
Share repurchase price (in dollars per share)	$ 10.98	$ 17.75

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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