Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Jun. 30, 2019
Intangible Assets [Line Items]
Gross Carrying Amount, amortized intangible assets	$ 822.5	$ 823.3
Gross Carrying Amount, total intangible assets	827.3	846.3
Accumulated Amortization	(207.3)	(161.6)
Net, amortized intangible assets	615.2	661.7
Net, total intangible assets	620.0	684.7
Net, non-amortizable intangible assets	4.8	23.0
In-Process Research and Development [Member]
Intangible Assets [Line Items]
Net, non-amortizable intangible assets	4.8	23.0
Purchased Licenses and Technologies [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, amortized intangible assets	814.9	815.7
Accumulated Amortization	(201.8)	(156.6)
Net, amortized intangible assets	613.0	659.1
Customer Relationships [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, amortized intangible assets	4.7	4.6
Accumulated Amortization	(4.1)	(3.8)
Net, amortized intangible assets	0.5	0.8
Trademarks [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, amortized intangible assets	3.0	3.0
Accumulated Amortization	(1.4)	(1.2)
Net, amortized intangible assets	$ 1.7	$ 1.8