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Goodwill and Intangible Assets - Summary of Changes to Goodwill Balance (Detail)
$ in Millions
6 Months Ended
Dec. 31, 2017
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Beginning balance $ 316.1
Adjustments to acquisitions 1.9
Translation adjustments 1.4
Ending balance $ 319.4