Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Redeemable convertible preferred stock, liquidation preference	$ 50	[1]	$ 50	[1]
Redeemable convertible preferred stock, shares outstanding	76,002	[1]	76,002	[1]
Common stock, par value	$ 0.01	[1]	$ 0.01	[1]
Common stock, shares issued	49,693,532	[1]	49,697,763	[1]
Common stock, shares outstanding	49,693,532	[1]	49,697,763	[1]
Treasury stock, shares	8,738,094	[1]	8,758,267	[1]
Allowance for Doubtful Accounts [Member]
Allowances for receivables	$ 38.3	[1]	$ 21.2	[1]

[1] See Note 23 - Restatement of Consolidated Financial Statements