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Intangible Assets - Estimated Aggregate Amortization Expense (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 287.2
2020 270.7
2021 247.3
2022 222.2
2023 198.2
Thereafter 547.4
Total $ 1,773.0