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Goodwill and Intangible Assets - Estimated Aggregate Amortization Expense (Details)
$ in Millions
Jan. 31, 2020
USD ($)
Estimated aggregate future amortization expense  
Expense remainder of fiscal year $ 15.3
2021 56.3
2022 47.0
2023 39.2
2024 31.9
Thereafter $ 135.3