Employee Benefit Plans (Tables)

9 Months Ended

Oct. 31, 2020

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)	2020		2019		2020		2019
Net Periodic Benefit Cost:
Service cost	$	4.8	$	4.3	$	0.8	$	0.6
Interest cost	7.4		8.1		0.7		0.8
Expected return on plan assets	(9.7)		(9.2)		—		—
Amortization of prior service credit	—		—		—		(0.1)
Amortization of net loss	5.5		2.8		—		—
Net expense	$	8.0	$	6.0	$	1.5	$	1.3

	Nine Months Ended October 31,
	Pension Benefits				Other Postretirement Benefits
(in millions)	2020		2019		2020		2019
Net Periodic Benefit Cost:
Service cost	$	14.3	$	12.8	$	2.4	$	1.9
Interest cost	22.1		24.4		2.2		2.5
Expected return on plan assets	(29.0)		(27.6)		—		—
Amortization of prior service credit	—		—		(0.1)		(0.4)
Amortization of net loss	16.5		8.4		0.1		—
Net expense	$	23.9	$	18.0	$	4.6	$	4.0