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Employee Benefit Plans - Future Benefit Payments (Details)
$ in Millions
Jan. 31, 2020
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 29.3
2021 30.4
2022 31.1
2023 32.6
2024 33.9
2025-2029 197.5
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 2.0
2021 2.1
2022 2.2
2023 2.4
2024 2.5
2025-2029 $ 16.1