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Intangible Assets - Estimated Aggregate Amortization Expense (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2020 $ 366.5
2021 342.7
2022 316.6
2023 290.3
2024 254.0
Thereafter 748.6
Total $ 2,318.7