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Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Numerator:                
Net income/(loss) $ 6.7 $ 12.8 $ 3.8 $ (13.7) $ (82.4) $ (26.5) $ 23.3 $ (122.6)
Denominator:                
Shares, basic 34.4     34.5     34.7 34.0
Effect of dilutive share-based awards 0.6           0.8  
Shares, diluted 35.0     34.5     35.5 34.0
Net income/(loss) per share:                
Basic $ 0.19     $ (0.40)     $ 0.67 $ (3.61)
Diluted $ 0.19     $ (0.40)     $ 0.66 $ (3.61)