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Goodwill and Intangible Assets - Summary of Changes to Goodwill Balance (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Beginning balance $ 316.1 $ 195.3
Acquisitions   116.3
Adjustments to acquisitions 1.9 3.6
Translation adjustments 0.6 0.9
Ending balance $ 318.6 $ 316.1