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Revenue Recognition - Topic 606 Disclosure of Impact of Adoption to Condensed Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Millions | 6 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |
Accounts receivable, net | $ (31.7) | $ 30.0
Other accrued liabilities | 6.5 | $ (6.6)
Adjustments [Member] | Topic 606 [Member] |  |
Cash flows from operating activities: |  |
Accounts receivable, net | (0.1) |
Other accrued liabilities | 0.1 |
Proforma as if previous standard was in effect [Member] | Topic 606 [Member] |  |
Cash flows from operating activities: |  |
Accounts receivable, net | (31.8) |
Other accrued liabilities | $ 6.6 |

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- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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