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Acquired Intangibles and Goodwill - Schedule of Changes in Goodwill (Detail)
$ in Millions
9 Months Ended
Mar. 31, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Beginning balance $ 206.8
Acquisition activity 157.3
Post-acquisition adjustments 40.1
Ending balance $ 404.2