CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIENCY (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Treasury stock authorized to satisfy minimum statutory tax withholding requirements	83,582	138,433	147,161
Total value	$ 1.2	$ 1.4	$ 2.5
Class A Common Stock [Member]
Treasury stock authorized to satisfy minimum statutory tax withholding requirements
Treasury Stock [Member] | Class A Common Stock [Member]
Treasury stock authorized to satisfy minimum statutory tax withholding requirements	83,582	138,433	147,161
Weighted average price per share	$ 14.20	$ 10.07	$ 16.84
Total value	$ 1.2	$ 1.4	$ 2.5