Retirement Plans (Tables)

6 Months Ended

Mar. 31, 2023

Retirement Benefits [Abstract]

Schedule of Net Periodic Pension and Postretirement Cost (Benefit)

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

	Three Months Ended March 31,				Six Months Ended March 31,
	2023		2022		2023		2022
Service cost	$	0.4	$	1.0	$	0.9	$	2.0
Interest cost	5.4		2.6		10.6		5.2
Expected return on plan assets	(5.5)		(5.3)		(10.9)		(10.6)
Recognized net actuarial loss	0.4		1.6		0.8		3.1
Defined benefit settlement loss	7.2		—		7.2		—
Net periodic cost (income)	$	7.9	$	(0.1)	$	8.6	$	(0.3)