CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts on trade receivables	$ 11.8	$ 11.1
Accumulated depreciation on property, plant and equipment	342.6	304.7
Accumulated amortization on intangible assets	$ 97.1	$ 84.8
Class A Common Stock
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, authorized (in shares)	900,000,000	900,000,000
Common Stock, issued (in shares)	53,910,742	53,956,073
Treasury stock (in shares)	1,071,271	1,024,908