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Goodwill and Other Intangible Assets - Schedule of Estimated Annual Amortization Expense Related to Other Intangible Assets (Detail)
$ in Millions
Mar. 31, 2016
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2016 $ 64.7
2017 58.8
2018 52.9
2019 48.7
2020 45.2
2021 and thereafter 136.3
Total $ 406.6