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Goodwill and Intangible Assets - Summary of Changes to Goodwill Balance (Detail)
$ in Millions
6 Months Ended
Dec. 31, 2016
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Beginning balance $ 195.3
Acquisitions 120.5
Adjustments to acquisitions 0.8
Translation adjustments (1.2)
Ending balance $ 315.4