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Goodwill and Other Intangible Assets - Schedule of Estimated Annual Amortization Expense Related to Other Intangible Assets (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2019 $ 23.4
2020 19.6
2021 19.4
2022 19.3
2023 19.2
2024 and thereafter 12.4
Total $ 113.3