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Acquisitions - Pro Forma Results of Acquisitions (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Business Combinations [Abstract] |  |  |  |
Revenue | $ 194.0 | $ 196.5 | $ 384.2 | $ 385.4
Income from operations | 4.4 | 13.2 | 91.9 | 12.4
Net income (loss) | $ 32.1 | $ 5.9 | $ 113.2 | $ (13.3)
Net income (loss) per share, basic | $ 0.46 | $ 0.09 | $ 1.64 | $ (0.19)
Net income (loss) per share, diluted | $ 0.45 | $ 0.09 | $ 1.59 | $ (0.19)

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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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