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Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($)
$ in Millions
Dec. 31, 2017
Jun. 30, 2017
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 2.6 $ 2.6
Property and equipment, accumulated depreciation $ 122.5 $ 106.8
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares issued 61,933,342 60,579,911
Common stock, shares outstanding 34,293,466 34,638,435
Common treasury shares 27,639,876 25,941,476