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Goodwill and Intangible Assets - Estimated Aggregate Amortization Expense (Details)
$ in Millions
Jul. 31, 2018
USD ($)
Estimated aggregate future amortization expense  
Expense remainder of fiscal year $ 56.7
2020 67.5
2021 58.4
2022 49.2
2023 41.2
Thereafter $ 160.2