Retirement Benefits (Tables)

9 Months Ended

Jun. 30, 2022

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The components of net periodic benefit cost were (in millions):

	Pension Benefits
	Three Months Ended June 30,				Nine Months Ended June 30,
	2022		2021		2022		2021
Service cost	$	15.4	$	23.1	$	56.1	$	68.7
Interest cost	34.5		31.5		99.3		94.3
Expected return on plan assets	(56.4)		(60.9)		(175.1)		(182.0)
Amortization:
Prior service cost	—		0.3		0.8		1.0
Net actuarial loss	10.4		37.0		55.0		110.5
Settlement and curtailment (benefit) charges	(0.7)		27.2		24.2		26.8
Net periodic benefit cost	$	3.2	$	58.2	$	60.3	$	119.3

	Other Postretirement Benefits
	Three Months Ended June 30,				Nine Months Ended June 30,
	2022		2021		2022		2021
Service cost	$	0.2	$	0.3	$	0.6	$	0.8
Interest cost	0.3		0.3		0.9		0.9
Amortization:
Prior service credit	(0.2)		(1.4)		(0.6)		(4.1)
Net actuarial loss	0.2		0.3		0.5		0.9
Net periodic benefit cost (credit)	$	0.5	$	(0.5)	$	1.4	$	(1.5)