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Intangible Assets and Goodwill - Estimated Amortization Expense (Detail)
$ in Millions
Dec. 31, 2015
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2016 $ 36.7
2017 31.6
2018 15.6
2019 5.4
2020 5.4
Thereafter 2.7
Total estimated amortization expense $ 97.4