Pensions and Other Postretirement Benefits (Tables)

9 Months Ended

Jan. 31, 2023

Retirement Benefits [Abstract]

Net periodic benefit cost

The components of our net periodic benefit cost for defined benefit pension and other postretirement benefit plans are shown below.

	Three Months Ended January 31,
	Defined Benefit Pension Plans				Other Postretirement Benefits
	2023		2022		2023		2022
Service cost	$	0.3	$	0.4	$	0.2	$	0.3
Interest cost	4.6		3.1		0.6		0.3
Expected return on plan assets	(3.6)		(3.9)		—		—
Amortization of net actuarial loss (gain)	1.0		1.7		(0.3)		(0.1)
Amortization of prior service cost (credit)	0.1		0.3		(0.1)		(0.2)
Settlement loss (gain)	1.4		1.3		—		—
Net periodic benefit cost	$	3.8	$	2.9	$	0.4	$	0.3

	Nine Months Ended January 31,
	Defined Benefit Pension Plans				Other Postretirement Benefits
	2023		2022		2023		2022
Service cost	$	0.9	$	1.3	$	0.7	$	0.9
Interest cost	13.4		9.3		1.8		1.0
Expected return on plan assets	(11.7)		(12.1)		—		—
Amortization of net actuarial loss (gain)	3.0		5.2		(0.9)		(0.3)
Amortization of prior service cost (credit)	0.5		0.7		(0.5)		(0.5)
Settlement loss (gain)	3.1		7.5		—		—
Net periodic benefit cost	$	9.2	$	11.9	$	1.1	$	1.1