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Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Millions	Dec. 31, 2019	Jun. 30, 2019
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 1.7	$ 2.1
Property and equipment, accumulated depreciation	$ 134.2	$ 133.1
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	65,388,813	64,283,948
Common stock, shares outstanding	33,898,937	33,349,735
Common treasury shares	31,489,876	30,934,213

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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