Employee Benefit Plans (Tables)

9 Months Ended

Oct. 31, 2017

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 October 31,
	Pension Benefits						Other Postretirement Benefits
(in millions)	2017			2016			2017			2016
Net Periodic Benefit Cost:
Service cost	$	4.3		$	4.4		$	0.7		$	0.7
Interest cost	7.9			7.9			0.8			0.8
Expected return on plan assets	(8.2		)	(5.9		)	—			—
Amortization of prior service cost (credit)	0.1			—			(0.2		)	(0.2		)
Amortization of net loss	3.3			3.7			—			—
Net expense	$	7.4		$	10.1		$	1.3		$	1.3

	Nine Months Ended October 31,
	Pension Benefits						Other Postretirement Benefits
(in millions)	2017			2016			2017			2016
Net Periodic Benefit Cost:
Service cost	$	13.0		$	13.1		$	2.1		$	2.1
Interest cost	23.9			23.7			2.2			2.3
Expected return on plan assets	(24.7		)	(17.6		)	—			—
Amortization of prior service cost (credit)	0.2			—			(0.5		)	(0.5		)
Amortization of net loss	9.9			11.0			—			—
Net expense	$	22.3		$	30.2		$	3.8		$	3.9