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Intangible Assets - Estimated Aggregate Amortization Expense (Detail)
$ in Millions
Sep. 30, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 (remaining three months) $ 85.3
2020 328.9
2021 304.7
2022 275.6
2023 249.2
Thereafter 829.8
Total $ 2,073.5