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Employee Benefit Plans Future Benefit Payments (Details)
$ in Millions
Jan. 31, 2018
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 27.1
2020 27.4
2021 28.5
2022 29.8
2023 30.6
2024-2028 175.1
Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 1.9
2020 2.0
2021 2.1
2022 2.2
2023 2.4
2024-2028 $ 14.8