CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Allowance for doubtful accounts on trade receivables	$ 6.1	$ 4.2
Accumulated depreciation on property, plant and equipment	244.5	243.1
Accumulated amortization on intangible assets	$ 34.6	$ 19.0
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)	53,925,029	53,231,651
Treasury Stock, at cost, shares (shares)	754,853	754,853