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Acquisitions - Pro Forma Results of Acquisitions (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Business Combinations [Abstract]    
Revenue $ 190.2 $ 188.9
Income from operations 87.4 (0.8)
Net income (loss) $ 81.1 $ (19.2)
Net income (loss) per share, basic $ 1.18 $ (0.28)
Net income (loss) per share, diluted $ 1.15 $ (0.28)