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Acquisitions - Pro Forma Results of Acquisitions (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Business Combinations [Abstract] |  |  |  |
Revenue | $ 193.5 | $ 196.9 | $ 577.7 | $ 582.3
Income from operations | 17.0 | 7.7 | 109.0 | 23.3
Net income (loss) | $ 11.4 | $ 4.2 | $ 124.6 | $ (9.1)
Net income (loss) per share, basic | $ 0.16 | $ 0.06 | $ 1.80 | $ (0.13)
Net income (loss) per share, diluted | $ 0.16 | $ 0.06 | $ 1.74 | $ (0.13)

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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