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Intangible Assets - Estimated Aggregate Amortization Expense (Detail)
$ in Millions
Jun. 30, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 (remaining six months) $ 162.3
2020 311.8
2021 287.5
2022 258.3
2023 232.9
Thereafter 756.0
Total $ 2,008.8