Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019
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