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Acquired Intangibles and Goodwill - Schedule of Changes in Goodwill (Detail)
$ in Millions
6 Months Ended
Dec. 31, 2017
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Beginning balance $ 206.8
Acquisition activity 157.3
Post-acquisition adjustments 4.2
Ending balance $ 368.3