Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 3.9	$ 5.3	$ 8.7	$ 11.3
Interest Cost	7.8	7.6	15.8	15.3
Expected Return on Plan Assets	(5.9)	(6.2)	(11.7)	(12.3)
Amortization of prior service credit	0.0	0.0	0.0	0.0
Amortization of net loss	3.5	7.0	7.3	14.4
Net Periodic Benefit Cost	9.3	13.7	20.1	28.7
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	0.6	1.0	1.4	2.1
Interest Cost	0.7	0.8	1.6	1.6
Expected Return on Plan Assets	0.0	0.0	0.0	0.0
Amortization of prior service credit	(0.2)	(0.2)	(0.4)	(0.4)
Amortization of net loss	(0.1)	0.4	0.0	0.8
Net Periodic Benefit Cost	$ 1.0	$ 2.0	$ 2.6	$ 4.1