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Intangible Assets - Estimated Aggregate Amortization Expense (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 257.2
2019 243.3
2020 226.7
2021 203.4
2022 180.6
Total $ 1,111.2