Employee Benefit Plans Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Health Care Cost Trend Rate Assumed for Next Fiscal Year	7.00%
Liability, Defined Benefit Plan, Current	$ 8.6	$ 7.5
Pension/postretirement benefit obligations	$ 287.4	318.6
Health Care Cost Trend Rate	4.75%
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Years of Service	10 years
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer Contribution	$ 1.3	1.3
Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Average Compensation Term Of Employment	five years of the last 10 years
Years of Service	10 years
Employer Contribution	$ 15.0	$ 120.0
Qualified Plan [Member] | Equity Securities, Investment Summary [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50.00%
Qualified Plan [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	35.00%
Qualified Plan [Member] | Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	15.00%