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Intangible Assets - Estimated Aggregate Amortization Expense (Detail)
$ in Millions
Jun. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 (remaining six months) $ 137.7
2019 263.9
2020 247.3
2021 224.0
2022 200.7
Thereafter 657.4
Total $ 1,731.0