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Goodwill and Other Intangible Assets, Net - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 178.1
2020 148.0
2021 122.3
2022 87.5
2023 68.7
Thereafter $ 882.0