Employee Benefit Plans (Tables)

6 Months Ended

Jul. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures

Net periodic pension and other postretirement benefit expense included the following components:

	Three Months Ended July 31,
	Pension Benefits						Other Postretirement Benefits
(in millions)	2016			2015			2016			2015
Net Periodic Benefit Cost:
Service cost	$	3.9		$	5.3		$	0.6		$	1.0
Interest cost	7.8			7.6			0.7			0.8
Expected return on plan assets	(5.9		)	(6.2		)	—			—
Amortization of prior service credit	—			—			(0.2		)	(0.2		)
Amortization of net loss	3.5			7.0			(0.1		)	0.4
Net expense	$	9.3		$	13.7		$	1.0		$	2.0

	Six Months Ended July 31,
	Pension Benefits						Other Postretirement Benefits
(in millions)	2016			2015			2016			2015
Net Periodic Benefit Cost:
Service cost	$	8.7		$	11.3		$	1.4		$	2.1
Interest cost	15.8			15.3			1.6			1.6
Expected return on plan assets	(11.7		)	(12.3		)	—			—
Amortization of prior service credit	—			—			(0.4		)	(0.4		)
Amortization of net loss	7.3			14.4			—			0.8
Net expense	$	20.1		$	28.7		$	2.6		$	4.1