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Goodwill and Intangible Assets - Summary of Changes to Goodwill Balance (Detail)
$ in Millions
3 Months Ended
Sep. 30, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Beginning balance $ 318.6
Acquisitions 94.9
Translation adjustments (0.2)
Ending balance $ 413.3