Employee Benefit Plans Reconcilation of Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at beginning of the year	$ 385.8
Fair Value of Plan Assets at end of year	530.1	$ 385.8
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at beginning of year	742.6	841.7
Service cost	17.4	22.6	$ 16.8
Interest cost	31.6	30.6	28.3
Participants' contributions	0.0	0.0
MMA retiree drug subsidy	0.0	0.0
Actuarial (Gain) Loss	15.9	(128.8)
Benefits Paid	(24.3)	(23.1)
Curtailments	0.0	(0.2)
Translation	0.5	(0.2)
Benefit Obligation at end of year	783.7	742.6	841.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at beginning of the year	385.8	406.0
Actual Return on Plan Assets	42.9	(2.2)
Employer Contribution	125.7	5.1
Participants' contributions	0.0	0.0
MMA retiree drug subsidy	0.0	0.0
Benefits Paid	(24.3)	(23.1)
Fair Value of Plan Assets at end of year	530.1	385.8	406.0
Funded Status	(253.6)	(356.8)
Other Postretirement Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at beginning of year	78.4	92.9
Service cost	2.8	4.2	2.4
Interest cost	3.1	3.2	2.6
Participants' contributions	1.2	1.3
MMA retiree drug subsidy	0.0	0.2
Actuarial (Gain) Loss	(10.5)	(20.4)
Benefits Paid	(2.5)	(3.0)
Curtailments	0.0	0.0
Translation	0.0	0.0
Benefit Obligation at end of year	72.5	78.4	92.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at beginning of the year	0.0	0.0
Actual Return on Plan Assets	0.0	0.0
Employer Contribution	1.3	1.5
Participants' contributions	1.2	1.3
MMA retiree drug subsidy	0.0	0.2
Benefits Paid	(2.5)	(3.0)
Fair Value of Plan Assets at end of year	0.0	0.0	$ 0.0
Funded Status	$ (72.5)	$ (78.4)