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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Condensed Consolidated Balance Sheets |  |
Allowance for doubtful accounts | $ 43.3 | $ 44.8
Accumulated depreciation | $ 1,767.5 | $ 1,738.6

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