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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions | Dec. 31, 2017 | Jun. 30, 2017
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Statement Of Financial Position [Abstract] |  |
Allowance for doubtful accounts | $ 9.5 | $ 8.2
Common stock, shares outstanding | 69.4 | 68.4

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