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Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Jun. 30, 2015
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable intangible assets $ 206.8 $ 206.8
Gross Carrying Amount, total intangible assets 211.6 211.6
Accumulated Amortization (25.3) (19.0)
Net, amortizable intangible assets 181.5 187.8
Net, total intangible assets 186.3 192.6
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 199.1 199.1
Accumulated Amortization (22.6) (16.7)
Net, amortizable intangible assets 176.5 182.4
Customer Relationships    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable intangible assets 4.7 4.7
Accumulated Amortization (2.2) (1.9)
Net, amortizable intangible assets 2.5 2.8
Trademarks    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable intangible assets 3.0 3.0
Accumulated Amortization (0.5) (0.4)
Net, amortizable intangible assets $ 2.5 $ 2.6