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Intangible Assets - Estimated Aggregate Amortization Expense (Detail)
$ in Millions
Dec. 31, 2016
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 $ 239.6
2018 226.8
2019 213.1
2020 197.0
2021 174.5
Total $ 1,051.0