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Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
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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