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Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($)
$ in Millions
Mar. 31, 2020
Jun. 30, 2019
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 1.7 $ 2.1
Property and equipment, accumulated depreciation $ 139.1 $ 133.1
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares issued 65,752,215 64,283,948
Common stock, shares outstanding 34,004,920 33,349,735
Common treasury shares 31,747,295 30,934,213