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Goodwill and Other Intangible Assets - Summary of Estimated Future Annual Amortization Expense for Intangible Assets (Detail)
$ in Millions
Jun. 30, 2016
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2016 $ 64.7
2017 55.0
2018 48.7
2019 42.7
2020 36.0
2021 $ 28.2