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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		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net income/(loss)	$ 12.8	$ (82.4)	$ 16.6	$ (108.9)
Denominator:
Shares, basic	34.5	34.1	34.8	33.8
Effect of dilutive share-based awards	0.6		0.8
Shares, diluted	35.1	34.1	35.6	33.8
Net income/(loss) per share:
Basic	$ 0.37	$ (2.42)	$ 0.48	$ (3.22)
Diluted	$ 0.36	$ (2.42)	$ 0.47	$ (3.22)

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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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