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Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Millions	Dec. 31, 2020	Jun. 30, 2020
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

X

- Definition

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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