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Goodwill and Intangible Assets - Summary of Changes to Goodwill Balance (Detail)
$ in Millions
9 Months Ended
Mar. 31, 2019
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Beginning balance $ 318.6 [1]
Acquisitions (see Note 3) 98.3
Translation adjustments (1.0)
Ending balance $ 415.9
[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 contained in Part I, Item 1 of this report for additional information.