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Other Intangible Assets - Schedule of Future Amortization Estimated Expense (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2020 $ 22.7
2021 19.5
2022 17.9
2023 14.5
2024 $ 12.5