Employee Benefit Plans Reconcilation of Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at beginning of the year	$ 406.0
Fair Value of Plan Assets at end of year	385.8	$ 406.0
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at beginning of year	841.7	615.9
Service cost	22.6	16.8	$ 19.1
Interest cost	30.6	28.3	27.0
Participants' contributions	0.0	0.0
Amendments	0.0	0.8
MMA retiree drug subsidy	0.0	0.0
Actuarial (Gain) Loss	(128.8)	202.3
Benefits Paid	(23.1)	(20.2)
Curtailments	(0.2)
Translation	(0.2)	(2.2)
Benefit Obligation at end of year	742.6	841.7	615.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at beginning of the year	406.0	397.4
Actual Return on Plan Assets	(2.2)	26.0
Employer Contribution	5.1	2.8
Participants' contributions	0.0	0.0
MMA retiree drug subsidy	0.0	0.0
Benefits Paid	(23.1)	(20.2)
Fair Value of Plan Assets at end of year	385.8	406.0	397.4
Funded Status	(356.8)	(435.7)
Other Postretirement Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at beginning of year	92.9	54.7
Service cost	4.2	2.4	2.8
Interest cost	3.2	2.6	2.8
Participants' contributions	1.3	1.5
Amendments	0.0	0.0
MMA retiree drug subsidy	0.2	0.1
Actuarial (Gain) Loss	(20.4)	34.9
Benefits Paid	(3.0)	(3.3)
Translation	0.0	0.0
Benefit Obligation at end of year	78.4	92.9	54.7
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	1.5	1.7
Participants' contributions	1.3	1.5
MMA retiree drug subsidy	0.2	0.1
Benefits Paid	(3.0)	(3.3)
Fair Value of Plan Assets at end of year	0.0	0.0	$ 0.0
Funded Status	$ (78.4)	$ (92.9)