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Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Jun. 30, 2016
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable intangible assets $ 531.2 $ 236.4
Gross Carrying Amount, total intangible assets 552.7 259.0
Accumulated Amortization (46.3) (31.5)
Net, amortizable intangible assets 484.9 204.9
Net, total intangible assets 506.4 227.5
Net, non-amortizable intangible assets 21.5 22.6
In-Process Research and Development [Member]    
Intangible Assets [Line Items]    
Net, non-amortizable intangible assets 21.5 22.6
Purchased Licenses and Technologies [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable intangible assets 523.5 228.7
Accumulated Amortization (43.0) (28.5)
Net, amortizable intangible assets 480.5 200.2
Customer Relationships [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable intangible assets 4.7 4.7
Accumulated Amortization (2.6) (2.4)
Net, amortizable intangible assets 2.1 2.3
Trademarks [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable intangible assets 3.0 3.0
Accumulated Amortization (0.7) (0.6)
Net, amortizable intangible assets $ 2.3 $ 2.4