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Intangible Assets - Estimated Aggregate Amortization Expense (Detail)
$ in Millions
Jun. 30, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 (remaining six months) $ 127.1
2018 244.7
2019 230.6
2020 214.4
2021 191.7
Total $ 1,008.5