Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable intangible assets	$ 534.0	$ 533.3
Gross Carrying Amount, total intangible assets	557.5	556.4
Accumulated Amortization	(102.3)	(64.9)
Net, amortizable intangible assets	431.7	468.4
Net, total intangible assets	455.2	491.5
Net, non-amortizable intangible assets	23.5	23.1
In-Process Research and Development [Member]
Intangible Assets [Line Items]
Net, non-amortizable intangible assets	23.5	23.1
Purchased Licenses and Technologies [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable intangible assets	526.4	525.7
Accumulated Amortization	(98.0)	(61.3)
Net, amortizable intangible assets	428.4	464.4
Customer Relationships [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable intangible assets	4.6	4.6
Accumulated Amortization	(3.3)	(2.8)
Net, amortizable intangible assets	1.3	1.8
Trademarks [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable intangible assets	3.0	3.0
Accumulated Amortization	(1.0)	(0.8)
Net, amortizable intangible assets	$ 2.0	$ 2.2