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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, 2017
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2018 $ 27.8
2019 24.1
2020 20.3
2021 20.0
2022 19.3
2023 and thereafter 31.8
Total $ 143.3