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Goodwill and Intangible Assets - Estimated Aggregate Finite-Lived Intangible Asset Amortization Expense (Detail)
$ in Millions
Jun. 30, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 $ 20.7
2018 20.3
2019 20.3
2020 12.2
2021 $ 10.5