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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, 2016
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2017 $ 28.6
2018 27.8
2019 24.1
2020 20.3
2021 20.0
2022 and thereafter 51.1
Total $ 171.9