Employee Benefit Plans Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Health Care Cost Trend Rate Assumed for Next Fiscal Year	7.25%
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	$ 7.1	$ 4.3
Pension/postretirement benefit obligations	$ 428.1	524.2
Health Care Cost Trend Rate	4.75%
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	$ 3.9
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	$ 2.8
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Years of Service	10 years
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
Qualified Plan [Member] | Equity Securities, Investment Summary [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	50.00%
Qualified Plan [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	35.00%
Qualified Plan [Member] | Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	15.00%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer Contribution	$ 1.5	$ 1.7
Excess Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Years of Service	10 years