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Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Consolidated Balance Sheets |  |
Accounts receivable, allowance for doubtful accounts | $ 23.6 | $ 25.6
Accumulated depreciation | $ 1,007.2 | $ 900.9
Class A Common Stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Class A Common Stock, shares authorized | 1,000.0 | 1,000.0
Class A Common Stock, shares issued | 308.3 | 308.0
Class A Common Stock, shares outstanding | 308.3 | 308.0

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