CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts on trade receivables	$ 10.5	$ 9.3
Accumulated depreciation on property, plant and equipment	271.7	250.5
Accumulated amortization on intangible assets	$ 61.1	$ 39.3
Class A Common Stock [Member]
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)	54,088,174	53,925,029
Treasury Stock, at cost, shares (shares)	859,921	777,181