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Goodwill and Other Intangible Assets - Summary of Estimated Intangible Asset Amortization Expense (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2019 $ 0.8
2020 0.6
2021 0.3
2022 0.2
2023 0.2
Thereafter 1.8
Total $ 3.9