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Intangible Assets - Estimated Aggregate Amortization Expense (Detail)
$ in Millions
Sep. 30, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 (remaining three months) $ 65.4
2018 253.8
2019 239.5
2020 222.8
2021 198.7
Total $ 980.2