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Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Receivables, Net, Current [Abstract] |  |
Allowances for doubtful accounts | $ 23.9 | $ 25.9
Property and equipment, accumulated depreciation | $ 9,643.4 | $ 9,570.7

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