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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Dec. 31, 2015
Dec. 31, 2014
Consolidated Balance Sheets    
Accounts receivable, allowance for doubtful accounts $ 25.6 $ 20.2
Class A Common Stock, par value (in dollars per share) $ 0.001 $ 0.001
Class A Common Stock, shares authorized 1,000.0 500.0
Class A Common Stock, shares issued 308.0 309.9
Class A Common Stock, shares outstanding 308.0 309.9