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Goodwill and Other Intangible Assets, Net - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 340.0
2019 328.3
2020 267.6
2021 224.0
2022 205.4
Thereafter $ 2,659.9