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Goodwill and Intangible Assets - Estimated Aggregate Amortization Expense (Details)
$ in Millions
Jan. 31, 2018
USD ($)
Estimated aggregate future amortization expense  
Expense remainder of fiscal year $ 10.0
2019 34.8
2020 27.9
2021 22.6
2022 18.3
Thereafter $ 57.2