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Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($)
$ in Millions
Dec. 31, 2018
Jun. 30, 2018
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 2.1 $ 1.8
Property and equipment, accumulated depreciation $ 130.4 $ 127.4
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares issued 63,803,544 62,889,679
Common stock, shares outstanding 34,313,668 35,249,803
Common treasury shares 29,489,876 27,639,876