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Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Jun. 30, 2017
Intangible Assets [Line Items]    
Gross Carrying Amount, amortized intangible assets $ 534.8 $ 533.3
Gross Carrying Amount, total intangible assets 558.8 556.4
Accumulated Amortization (83.6) (64.8)
Net, amortized intangible assets 451.2 468.5
Net, total intangible assets 475.2 491.6
Net, non-amortizable intangible assets 24.0 23.1
In-Process Research and Development [Member]    
Intangible Assets [Line Items]    
Net, non-amortizable intangible assets 24.0 23.1
Purchased Licenses and Technologies [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortized intangible assets 527.2 525.7
Accumulated Amortization (79.6) (61.2)
Net, amortized intangible assets 447.6 464.5
Customer Relationships [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortized intangible assets 4.6 4.6
Accumulated Amortization (3.1) (2.8)
Net, amortized intangible assets 1.5 1.8
Trademarks [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortized intangible assets 3.0 3.0
Accumulated Amortization (0.9) (0.8)
Net, amortized intangible assets $ 2.1 $ 2.2