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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions | Dec. 31, 2016 | Jun. 30, 2016
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Statement of Financial Position [Abstract] |  |
Allowance for doubtful accounts | $ 7.8 | $ 6.8
Common stock, shares outstanding | 68.1 | 69.1

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