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Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Millions | Dec. 31, 2020 | Jun. 30, 2020
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Statement Of Financial Position [Abstract] |  |
Allowance for doubtful accounts receivable | $ 5.8 | $ 5.8
Property and equipment, accumulated depreciation | $ 129.0 | $ 131.2
Common stock, par value | $ 0.001 | $ 0.001
Common stock, shares authorized | 120,000,000 | 120,000,000
Common stock, shares issued | 66,677,341 | 65,871,648
Common stock, shares outstanding | 34,928,146 | 34,122,453
Common treasury shares | 31,749,195 | 31,749,195

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