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Goodwill and Intangible Assets - Estimated Aggregate Amortization Expense (Details)
$ in Millions
Oct. 31, 2019
USD ($)
Estimated aggregate future amortization expense  
Expense remainder of fiscal year $ 31.5
2021 55.4
2022 46.4
2023 38.7
2024 31.5
Thereafter $ 137.0