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Acquired Intangibles and Goodwill - Schedule of Expected Annual Aggregate Amortization Expense (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2020 $ 33.2  
2021 37.5  
2022 32.9  
2023 20.4  
2024 2.5  
2025 0.1  
Acquired intangibles, Net Carrying Value $ 126.6 $ 144.8