Employee Benefit Plans (Tables)

3 Months Ended

Dec. 31, 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:

	Pension benefits				Other postretirement benefits
(In millions)	2023		2022		2023		2022
Three months ended December 31
Interest cost	$	20.9	$	20.6	$	0.3	$	0.4
Expected return on plan assets	(17.2)		(16.8)		—		—
Amortization of prior service credits	—		—		(0.6)		(0.5)
Net periodic benefit costs (income)	$	3.7	$	3.8	$	(0.3)	$	(0.1)