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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, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income	$ 5.0	$ 19.8	$ 4.0	$ 6.7	$ 12.8	$ 3.8	$ 28.8	$ 23.3
Denominator:
Shares, basic	34.0			34.4			33.5	34.7
Effect of dilutive share-based awards	1.0			0.6			1.0	0.8
Shares, diluted	35.0			35.0			34.5	35.5
Net income per share:
Basic	$ 0.15			$ 0.19			$ 0.86	$ 0.67
Diluted	$ 0.14			$ 0.19			$ 0.83	$ 0.66

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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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