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Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($)
$ in Millions
Mar. 31, 2017
Jun. 30, 2016
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 4.0 $ 3.7
Property and equipment, accumulated depreciation $ 103.7 $ 87.3
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares issued 60,245,389 59,532,148
Common stock, shares outstanding 34,303,913 35,212,141
Common treasury shares 25,941,476 24,320,007