Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 4.4	$ 5.8	$ 13.1	$ 17.0
Interest Cost	7.9	7.6	23.7	22.9
Expected Return on Plan Assets	(5.9)	(6.2)	(17.6)	(18.5)
Amortization of prior service credit	0.0	0.0	0.0	0.0
Amortization of net loss	3.7	7.2	11.0	21.7
Net Periodic Benefit Cost	10.1	14.4	30.2	43.1
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	0.7	1.1	2.1	3.2
Interest Cost	0.8	0.8	2.3	2.4
Expected Return on Plan Assets	0.0	0.0	0.0	0.0
Amortization of prior service credit	(0.2)	(0.2)	(0.5)	(0.5)
Amortization of net loss	0.0	0.4	0.0	1.1
Net Periodic Benefit Cost	$ 1.3	$ 2.1	$ 3.9	$ 6.2