Employee Benefit Plans (Tables)

6 Months Ended

Jul. 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 July 31,
	Pension Benefits						Other Postretirement Benefits
(in millions)	2017			2016			2017			2016
Net Periodic Benefit Cost:
Service cost	$	3.9		$	3.9		$	0.7		$	0.6
Interest cost	8.0			7.8			0.7			0.7
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 (gain)	3.0			3.5			—			(0.1		)
Net expense	$	6.8		$	9.3		$	1.2		$	1.0

	Six Months Ended July 31,
	Pension Benefits						Other Postretirement Benefits
(in millions)	2017			2016			2017			2016
Net Periodic Benefit Cost:
Service cost	$	8.6		$	8.7		$	1.4		$	1.4
Interest cost	16.0			15.8			1.5			1.6
Expected return on plan assets	(16.5		)	(11.7		)	—			—
Amortization of prior service cost (credit)	0.2			—			(0.3		)	(0.4		)
Amortization of net loss	6.6			7.3			—			—
Net expense	$	14.9		$	20.1		$	2.6		$	2.6