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Income Taxes - Schedule of Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended												12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2017	[1]	Sep. 30, 2017	[1]	Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income (loss) before income taxes, United States													$ (0.6)	$ 122.3		$ 39.2
Income (loss) before income taxes, Foreign													0.6	(2.2)		(3.0)
Income before income tax	$ (7.7)	$ 3.3	$ 3.6	$ 0.8	$ 18.0		$ 13.3		$ 5.6		$ 83.2		$ 0.0	$ 120.1	[1]	$ 36.2	[1]
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.

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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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