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Goodwill and Intangible Assets - Summary of Changes to Goodwill Balance (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019		Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$ 318.6	[1]	$ 316.1
Acquisitions	94.9
Adjustments to acquisitions	4.4		1.9
Translation adjustments	(0.7)		0.6
Ending balance	$ 417.2		$ 318.6	[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

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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