Employee Benefit Plans (Tables)

9 Months Ended

Oct. 31, 2019

Retirement Benefits [Abstract]

Periodic Pension and Other Postretirement Benefit Expense

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

	Three Months Ended October 31,
	Pension Benefits				Other Postretirement Benefits
(in millions)	2019		2018		2019		2018
Net Periodic Benefit Cost:
Service cost	$	4.3	$	4.5	$	0.6	$	0.7
Interest cost	8.1		7.7		0.8		0.8
Expected return on plan assets	(9.2)		(8.4)		—		—
Amortization of prior service credit	—		—		(0.1)		(0.2)
Amortization of net loss	2.8		3.7		—		—
Net expense	$	6.0	$	7.5	$	1.3	$	1.3

	Nine Months Ended October 31,
	Pension Benefits				Other Postretirement Benefits
(in millions)	2019		2018		2019		2018
Net Periodic Benefit Cost:
Service cost	$	12.8	$	13.4	$	1.9	$	2.2
Interest cost	24.4		23.1		2.5		2.3
Expected return on plan assets	(27.6)		(25.1)		—		—
Amortization of prior service credit	—		—		(0.4)		(0.5)
Amortization of net loss	8.4		11.2		—		—
Net expense	$	18.0	$	22.6	$	4.0	$	4.0