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Intangible Assets and Goodwill - Schedule of Estimated Amortization Expense (Detail)
$ in Millions
Mar. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remainder of Fiscal 2018 $ 188.6
Fiscal 2019 366.4
Fiscal 2020 355.2
Fiscal 2021 333.3
Fiscal 2022 $ 320.9