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Goodwill and Intangible Assets - Summary of Changes to Goodwill Balance (Detail)
$ in Millions
3 Months Ended
Sep. 30, 2015
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Beginning balance $ 177.2
Acquisitions 0.0
Translation adjustments 0.1
Ending balance $ 177.3