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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
	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income/(loss)	$ 3.8	$ (26.5)
Denominator:
Shares, basic	35.1	33.5
Effect of dilutive share-based awards	1.0
Shares, diluted	36.1	33.5
Net income/(loss) per share:
Basic	$ 0.11	$ (0.79)
Diluted	$ 0.11	$ (0.79)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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