Employee Benefit Plans (Tables)

9 Months Ended

Jun. 30, 2023

Retirement Benefits [Abstract]

Components of Pension and Other Postretirement Benefit Income

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

	Pension benefits				Other postretirement benefits
(In millions)	2023		2022		2023		2022
Three months ended June 30
Interest cost	$	20.6	$	10.8	$	0.4	$	0.1
Expected return on plan assets	(16.8)		(19.7)		—		—
Amortization of prior service credits	0.1		0.1		(0.6)		(0.5)
Net periodic benefit costs (income)	$	3.9	$	(8.8)	$	(0.2)	$	(0.4)
Nine months ended June 30
Interest cost	$	61.8	$	32.4	$	1.2	$	0.5
Expected return on plan assets	(50.4)		(59.1)		—		—
Amortization of prior service credit	0.1		0.1		(1.7)		(1.6)
Net periodic benefit costs (income)	$	11.5	$	(26.6)	$	(0.5)	$	(1.1)