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Goodwill and Other Intangible Assets, Net - Estimated Amortization Expense Related to Intangible Assets (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 $ 18.1
2018 18.1
2019 17.9
2020 17.9
2021 16.2
Thereafter $ 40.5