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Intangible Assets - Estimated Aggregate Amortization Expense (Detail)
$ in Millions
Dec. 31, 2015
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2016 $ 232.7
2017 222.3
2018 208.3
2019 194.8
2020 178.1
Total $ 1,036.2