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Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Jun. 30, 2018
Intangible Assets [Line Items]    
Gross Carrying Amount, amortized intangible assets $ 822.9 $ 534.0
Gross Carrying Amount, total intangible assets 845.7 557.5
Accumulated Amortization (146.2) (102.3)
Net, amortized intangible assets 676.7 431.7
Net, total intangible assets 699.5 455.2 [1]
Net, non-amortizable intangible assets 22.8 23.5
In-Process Research and Development [Member]    
Intangible Assets [Line Items]    
Net, non-amortizable intangible assets 22.8 23.5
Purchased Licenses and Technologies [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortized intangible assets 815.3 526.4
Accumulated Amortization (141.4) (98.0)
Net, amortized intangible assets 673.9 428.4
Customer Relationships [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortized intangible assets 4.6 4.6
Accumulated Amortization (3.6) (3.3)
Net, amortized intangible assets 1.0 1.3
Trademarks [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortized intangible assets 3.0 3.0
Accumulated Amortization (1.2) (1.0)
Net, amortized intangible assets $ 1.8 $ 2.0
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.