Retirement Plans (Tables)

9 Months Ended

Jun. 30, 2024

Retirement Benefits [Abstract]

Schedule of Net Periodic Pension and Postretirement Cost (Benefit)

The Company’s net periodic pension and postretirement costs for its material plans were as follows:

	Three Months Ended June 30,				Nine Months Ended June 30,
	2024		2023		2024		2023
Service cost	$	0.5	$	0.5	$	1.4	$	1.4
Interest cost	5.3		5.3		16.0		15.9
Expected return on plan assets	(4.9)		(5.4)		(14.6)		(16.3)
Recognized net actuarial loss	0.4		0.4		1.1		1.2
Defined benefit settlement loss	—		—		—		7.2
Net periodic cost	$	1.3	$	0.8	$	3.9	$	9.4