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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, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income/(loss)	$ (13.7)	$ 4.5	$ (122.6)	$ 31.0
Denominator:
Shares, basic	34.5	34.8	34.0	34.9
Effect of dilutive share-based awards		0.6		0.8
Shares, diluted	34.5	35.4	34.0	35.7
Net income/(loss) per share:
Basic	$ (0.40)	$ 0.13	$ (3.61)	$ 0.89
Diluted	$ (0.40)	$ 0.13	$ (3.61)	$ 0.87

X

- Definition

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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