Retirement Plans (Tables)

6 Months Ended

Mar. 31, 2024

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit Cost

The components of net periodic cost for our Pension Plan are presented below:

	Three months ended				Six months ended
	March 31,				March 31,
	2024		2023		2024		2023
	(in millions)
Service cost	$	0.1	$	0.2	$	0.3	$	0.4
Pension expense other than service:
Interest cost	3.5		3.5		7.0		7.0
Expected return on plan assets	(3.3)		(3.4)		(6.6)		(6.9)
Amortization of actuarial net loss	0.8		0.9		1.6		1.8
Pension expense other than service	1.0		1.0		2.0		1.9
Net periodic cost	$	1.1	$	1.2	$	2.3	$	2.3