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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Condensed Consolidated Balance Sheets |  |
Accounts receivable, allowance for doubtful accounts | $ 38.8 | $ 33.6
Accumulated depreciation | $ 1,517.7 | $ 1,487.2

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