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Other Intangible Assets - Schedule of Future Amortization Estimated Expense (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2019 $ 23.2
2020 22.7
2021 19.5
2022 17.8
2023 $ 14.5