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Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | ---
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount, amortized intangible assets | $ 825.5 | $ 534.0 |
Gross Carrying Amount, total intangible assets | 848.6 | 557.5 |
Accumulated Amortization | (131.0) | (102.3) |
Net, amortized intangible assets | 694.5 | 431.7 |
Net, total intangible assets | 717.6 | 455.2 | [1]
Net, non-amortizable intangible assets | 23.1 | 23.5 |
In-Process Research and Development [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Net, non-amortizable intangible assets | 23.1 | 23.5 |
Purchased Licenses and Technologies [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount, amortized intangible assets | 817.9 | 526.4 |
Accumulated Amortization | (126.4) | (98.0) |
Net, amortized intangible assets | 691.5 | 428.4 |
Customer Relationships [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount, amortized intangible assets | 4.6 | 4.6 |
Accumulated Amortization | (3.5) | (3.3) |
Net, amortized intangible assets | 1.1 | 1.3 |
Trademarks [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount, amortized intangible assets | 3.0 | 3.0 |
Accumulated Amortization | (1.1) | (1.0) |
Net, amortized intangible assets | $ 1.9 | $ 2.0 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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