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Goodwill and Other Intangible Assets, Net - Estimated Amortization Expense Related to Intangible Assets (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 17.6
2020 17.5
2021 17.5
2022 16.3
2023 12.7
Thereafter $ 27.3