Employee Benefit Plans Projected Benefit Obligation, Plan Assets and Accumulated Benefit Obligation (Details) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 578.1	$ 530.1
Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	662.0	661.5
Fair Value of Plan Assets	578.1	530.1
Funded Status	(83.9)	(131.4)
Accumulated Benefit Obligation	600.2	599.0
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	112.6	103.6
Fair Value of Plan Assets	0.0	0.0
Funded Status	(112.6)	(103.6)
Accumulated Benefit Obligation	98.5	90.9
Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	21.0	18.6
Fair Value of Plan Assets	0.0	0.0
Funded Status	(21.0)	(18.6)
Accumulated Benefit Obligation	19.3	16.9
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	795.6	783.7	$ 742.6
Fair Value of Plan Assets	578.1	530.1	$ 385.8
Funded Status	(217.5)	(253.6)
Accumulated Benefit Obligation	$ 718.0	$ 706.8