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Intangible Assets - Estimated Aggregate Amortization Expense (Detail)
$ in Millions
Mar. 31, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 (remaining nine months) $ 226.3
2020 286.7
2021 262.8
2022 237.5
2023 213.5
Thereafter 614.6
Total $ 1,841.4