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Goodwill and Intangible Assets - Summary of Changes to Goodwill Balance (Detail) - USD ($) $ in Millions | 12 Months Ended
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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 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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