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Post Retirement Benefit Plans - Future Benefit Payments Next Five Years and Thereafter (Details)
$ in Millions
Oct. 31, 2019
USD ($)
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 59.7
2021 60.2
2022 62.0
2023 65.6
2024 67.2
2025-2029 323.6
Other Postretirement Benefits Plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 1.3
2021 1.3
2022 1.2
2023 1.1
2024 1.0
2025-2029 $ 4.2