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.