UNAUDITED CONSOLIDATED STATEMENT OF STOCKHOLDERS' DEFICIENCY (Parenthetical) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Tax withholdings related to net share settlements of restricted stock units and awards	$ 0.0	$ 0.6	$ 1.6	$ 3.5
Restricted Stock and Restricted Stock Units
Shares withheld for withholding taxes (in shares)	0	25,221	85,607	161,804
Restricted Stock and Restricted Stock Units \| Treasury Stock \| Class A Common Stock
Share repurchase price (in usd per share)	$ 0.00	$ 23.36	$ 18.86	$ 21.65

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