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Acquired Intangibles and Goodwill - Schedule of Expected Annual Aggregate Amortization Expense (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 65.4  
2019 73.8  
2020 50.3  
2021 37.4  
2022 26.3  
2023 3.1  
Thereafter 0.8  
To be determined 29.6  
Acquired intangibles, net $ 286.7 $ 101.0