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Intangible Assets - Estimated Aggregate Amortization Expense (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
2021 $ 378.4  
2022 352.3  
2023 327.1  
2024 291.3  
2025 251.3  
Thereafter 799.5  
Amortizable intangible assets, net $ 2,399.9 $ 2,318.7