Pensions and Other Postretirement Benefits (Tables)

9 Months Ended

Jan. 31, 2025

Retirement Benefits [Abstract]

Net periodic benefit cost

The following table summarizes our net periodic benefit cost for defined benefit pension and other postretirement benefit plans.

	Three Months Ended January 31,
	Defined Benefit Pension Plans				Other Postretirement Benefits
	2025		2024		2025		2024
Service cost	$	0.1	$	0.2	$	0.2	$	0.2
Interest cost	4.5		4.5		0.7		0.7
Expected return on plan assets	(3.1)		(4.0)		—		—
Amortization of net actuarial loss (gain)	1.1		1.0		(0.5)		(0.4)
Amortization of prior service cost (credit)	—		—		(0.2)		(0.1)
Net periodic benefit cost	$	2.6	$	1.7	$	0.2	$	0.4

	Nine Months Ended January 31,
	Defined Benefit Pension Plans				Other Postretirement Benefits
	2025		2024		2025		2024
Service cost	$	0.5	$	0.7	$	0.5	$	0.6
Interest cost	13.3		13.8		2.0		2.0
Expected return on plan assets	(9.3)		(12.2)		—		—
Amortization of net actuarial loss (gain)	3.3		2.7		(1.5)		(1.2)
Amortization of prior service cost (credit)	0.1		0.1		(0.5)		(0.4)
Settlement loss (gain)	—		3.2		—		—
Net periodic benefit cost	$	7.9	$	8.3	$	0.5	$	1.0