Employee Benefit Plans (Tables)

9 Months Ended

Oct. 31, 2018

Retirement Benefits [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)	2018			2017			2018			2017
Net Periodic Benefit Cost:
Service cost	$	4.5		$	4.3		$	0.7		$	0.7
Interest cost	7.7			7.9			0.8			0.8
Expected return on plan assets	(8.4		)	(8.2		)	—			—
Amortization of prior service cost (credit)	—			0.1			(0.2		)	(0.2		)
Amortization of net loss	3.7			3.3			—			—
Net expense	$	7.5		$	7.4		$	1.3		$	1.3

	Nine Months Ended October 31,
	Pension Benefits						Other Postretirement Benefits
(in millions)	2018			2017			2018			2017
Net Periodic Benefit Cost:
Service cost	$	13.4		$	13.0		$	2.2		$	2.1
Interest cost	23.1			23.9			2.3			2.2
Expected return on plan assets	(25.1		)	(24.7		)	—			—
Amortization of prior service cost (credit)	—			0.2			(0.5		)	(0.5		)
Amortization of net loss	11.2			9.9			—			—
Net expense	$	22.6		$	22.3		$	4.0		$	3.8