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Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($)
$ in Millions
Sep. 30, 2016
Jun. 30, 2016
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 3.8 $ 3.7
Property and equipment, accumulated depreciation $ 93.2 $ 87.3
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares issued 59,679,709 59,532,148
Common stock, shares outstanding 34,851,639 35,212,141
Common treasury shares 24,828,070 24,320,007