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Goodwill and Intangible Assets - Estimated Aggregate Amortization Expense (Details)
$ in Millions
Oct. 31, 2017
USD ($)
Estimated aggregate future amortization expense  
Expense remainder of fiscal year $ 20.2
2019 34.2
2020 27.5
2021 22.2
2022 18.0
Thereafter $ 56.2