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Acquisitions - Pro Forma Results of Acquisitions (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Business Combinations [Abstract] |  |  |  |
Revenue | $ 216.8 | $ 221.3 | $ 429.3 | $ 430.2
Income from operations | 6.1 | (7.3) | 17.6 | 61.9
Net income | $ 2.6 | $ 13.2 | $ 11.2 | $ 74.0
Net income per share, basic | $ 0.04 | $ 0.18 | $ 0.15 | $ 1.03
Net income per share, diluted | $ 0.03 | $ 0.18 | $ 0.15 | $ 1.00

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