CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Allowance for doubtful accounts on trade receivables	$ 11.1	$ 10.5
Accumulated depreciation on property, plant and equipment	304.7	271.7
Accumulated amortization on intangible assets	$ 84.8	$ 61.1
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)	53,956,073	54,088,174
Treasury Stock, at cost, shares (shares)	1,024,908	859,921