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Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Jun. 30, 2016
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable intangible assets $ 531.6 $ 236.4
Gross Carrying Amount, total intangible assets 553.6 259.0
Accumulated Amortization (55.5) (31.5)
Net, amortizable intangible assets 476.1 204.9
Net, total intangible assets 498.1 227.5
Net, non-amortizable intangible assets 22.0 22.6
In-Process Research and Development [Member]    
Intangible Assets [Line Items]    
Net, non-amortizable intangible assets 22.0 22.6
Purchased Licenses and Technologies [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable intangible assets 523.9 228.7
Accumulated Amortization (52.0) (28.5)
Net, amortizable intangible assets 471.9 200.2
Customer Relationships [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable intangible assets 4.7 4.7
Accumulated Amortization (2.7) (2.4)
Net, amortizable intangible assets 2.0 2.3
Trademarks [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable intangible assets 3.0 3.0
Accumulated Amortization (0.8) (0.6)
Net, amortizable intangible assets $ 2.2 $ 2.4