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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Allowance for doubtful accounts on trade receivables $ 4.2 $ 3.5
Accumulated depreciation on property, plant and equipment 243.1 226.0
Accumulated amortization on intangible assets $ 19.0 $ 29.7
Treasury Stock, at cost, shares (shares) 754,853 754,853
Class A Common Stock
   
Common Stock, par value (usd per share) $ 0.01 $ 0.01
Common Stock, shares authorized (shares) 900,000,000 900,000,000
Common Stock, shares issued (shares) 53,231,651 49,986,651
Treasury Stock, at cost, shares (shares) 754,853 754,853
Class B Common Stock
   
Common Stock, par value (usd per share) $ 0.01 $ 0.01
Common Stock, shares authorized (shares) 200,000,000 200,000,000
Common Stock, shares issued (shares) 0 3,125,000
Common Stock, shares outstanding (shares) 0 3,125,000