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Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Jun. 30, 2019
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Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortized intangible assets | $ 822.2 | $ 823.3
Gross Carrying Amount, total intangible assets | 844.5 | 846.3
Accumulated Amortization | (176.7) | (161.6)
Net, amortized intangible assets | 645.5 | 661.7
Net, total intangible assets | 667.8 | 684.7
Net, non-amortizable intangible assets | 22.3 | 23.0
In-Process Research and Development [Member] |  |
Intangible Assets [Line Items] |  |
Net, non-amortizable intangible assets | 22.3 | 23.0
Purchased Licenses and Technologies [Member] |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortized intangible assets | 814.5 | 815.7
Accumulated Amortization | (171.5) | (156.6)
Net, amortized intangible assets | 643.0 | 659.1
Customer Relationships [Member] |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortized intangible assets | 4.7 | 4.6
Accumulated Amortization | (3.9) | (3.8)
Net, amortized intangible assets | 0.8 | 0.8
Trademarks [Member] |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortized intangible assets | 3.0 | 3.0
Accumulated Amortization | (1.3) | (1.2)
Net, amortized intangible assets | $ 1.7 | $ 1.8

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