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Goodwill and Other Intangible Assets - Summary of Estimated Future Annual Amortization Expense for Intangible Assets (Detail)
$ in Millions
Jun. 30, 2017
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2017 $ 58.3
2018 52.3
2019 45.5
2020 38.5
2021 30.2
2022 $ 24.3