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Summary of Significant Accounting Policies - Expected Annual Amortization Expense (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Finite Lived Intangible Assets Future Amortization Expense [Abstract]  
2019 $ 49.6
2020 47.9
2021 46.5
2022 45.8
2023 $ 44.3