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Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Jun. 30, 2018
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Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortized intangible assets | $ 826.7 | $ 534.0
Gross Carrying Amount, total intangible assets | 850.0 | 557.5
Accumulated Amortization | (115.8) | (102.3)
Net, amortized intangible assets | 710.9 | 431.7
Net, total intangible assets | 734.2 | 455.2
Net, non-amortizable intangible assets | 23.3 | 23.5
In-Process Research and Development [Member] |  |
Intangible Assets [Line Items] |  |
Net, non-amortizable intangible assets | 23.3 | 23.5
Purchased Licenses and Technologies [Member] |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortized intangible assets | 819.1 | 526.4
Accumulated Amortization | (111.4) | (98.0)
Net, amortized intangible assets | 707.7 | 428.4
Customer Relationships [Member] |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortized intangible assets | 4.6 | 4.6
Accumulated Amortization | (3.4) | (3.3)
Net, amortized intangible assets | 1.2 | 1.3
Trademarks [Member] |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortized intangible assets | 3.0 | 3.0
Accumulated Amortization | (1.0) | (1.0)
Net, amortized intangible assets | $ 2.0 | $ 2.0

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