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Summary of Significant Accounting Policies - Expected Annual Amortization Expense (Detail)
$ in Millions
Dec. 31, 2015
USD ($)
Finite Lived Intangible Assets Future Amortization Expense [Abstract]  
2016 $ 49.7
2017 30.5
2018 28.7
2019 28.4
2020 $ 26.6