Retirement Benefits (Tables)

3 Months Ended

Dec. 31, 2022

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The components of net periodic pension and postretirement benefit (credit) cost were (in millions):

	Pension Benefits
		Three Months Ended December 31,
		2022		2021
Service cost		$	10.6	$	20.4
Interest cost		39.2		32.4
Expected return on plan assets		(51.3)		(59.4)
Amortization of net actuarial (gain) loss		(1.0)		22.3
Net periodic pension benefit (credit) cost		$	(2.5)	$	15.7

	Other Postretirement Benefits
		Three Months Ended December 31,
		2022		2021
Service cost		$	0.1	$	0.2
Interest cost		0.6		0.3
Amortization of prior service credit		—		(0.2)
Amortization of net actuarial loss		0.1		0.2
Net periodic postretirement benefit cost		$	0.8	$	0.5