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Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Jun. 30, 2019
Intangible Assets [Line Items]    
Gross Carrying Amount, amortized intangible assets $ 822.9 $ 823.3
Gross Carrying Amount, total intangible assets 845.6 846.3
Accumulated Amortization (192.1) (161.6)
Net, amortized intangible assets 630.8 661.7
Net, total intangible assets 653.5 684.7
Net, non-amortizable intangible assets 22.7 23.0
In-Process Research and Development [Member]    
Intangible Assets [Line Items]    
Net, non-amortizable intangible assets 22.7 23.0
Purchased Licenses and Technologies [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortized intangible assets 815.2 815.7
Accumulated Amortization (186.8) (156.6)
Net, amortized intangible assets 628.4 659.1
Customer Relationships [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortized intangible assets 4.7 4.6
Accumulated Amortization (4.0) (3.8)
Net, amortized intangible assets 0.7 0.8
Trademarks [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortized intangible assets 3.0 3.0
Accumulated Amortization (1.3) (1.2)
Net, amortized intangible assets $ 1.7 $ 1.8