Employee Benefit Plans (Tables)

6 Months Ended

Mar. 31, 2025

Retirement Benefits [Abstract]

Components of Pension and Other Postretirement Benefit Income

The following table summarizes the components of pension and other postretirement plan (income) expense:

	Pension benefits				Other postretirement benefits
(In millions)	2025		2024		2025		2024
Three months ended March 31
Interest cost	$	17.5	$	20.9	$	0.2	$	0.3
Expected return on plan assets	(18.1)		(17.1)		—		—
Amortization of prior service credits	—		—		(0.5)		(0.5)
Net periodic benefit (income) costs	$	(0.6)	$	3.8	$	(0.3)	$	(0.2)
Six months ended March 31
Interest cost	$	34.9	$	41.8	$	0.5	$	0.6
Expected return on plan assets	(36.1)		(34.3)		—		—
Amortization of prior service credit	—		—		(1.1)		(1.1)
Net periodic benefit (income) costs	$	(1.2)	$	7.5	$	(0.6)	$	(0.5)