Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Jun. 30, 2014
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable intangible assets	$ 206.8	$ 208.8
Gross Carrying Amount, total intangible assets	211.6	213.6
Accumulated Amortization	(19.0)	(8.3)
Net, amortizable intangible assets	187.8	200.5
Net, total intangible assets	192.6	205.3
Net, non-amortizable intangible assets	4.8	4.8
In-Process Research And Development
Intangible Assets [Line Items]
Net, non-amortizable intangible assets	4.8	4.8
Purchased Licenses And Technologies
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable intangible assets	199.1	201.1
Accumulated Amortization	(16.7)	(6.6)
Net, amortizable intangible assets	182.4	194.5
Customer Relationships
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable intangible assets	4.7	4.7
Accumulated Amortization	(1.9)	(1.5)
Net, amortizable intangible assets	2.8	3.2
Trademarks
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable intangible assets	3.0	3.0
Accumulated Amortization	(0.4)	(0.2)
Net, amortizable intangible assets	$ 2.6	$ 2.8