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Acquired Intangibles and Goodwill - Schedule of Expected Annual Aggregate Amortization Expense (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Jun. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 45.5  
2019 78.8  
2020 55.3  
2021 42.5  
2022 31.3  
2023 6.3  
Thereafter 3.8  
Acquired intangibles, net $ 263.5 $ 101.0