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Goodwill and Intangible Assets - Estimated Aggregate Amortization Expense (Details)
$ in Millions
Jan. 31, 2019
USD ($)
Estimated aggregate future amortization expense  
Expense remainder of fiscal year $ 17.7
2020 64.4
2021 54.6
2022 45.7
2023 38.1
Thereafter $ 170.9