Retirement Benefits (Tables)

3 Months Ended

Dec. 31, 2020

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

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

	Pension Benefits
	Three Months Ended December 31,
	2020		2019
Service cost	$	22.7	$	22.8
Interest cost	31.3		34.2
Expected return on plan assets	(60.4)		(61.2)
Amortization:
Prior service cost	0.4		0.2
Net actuarial loss	36.7		36.8
Settlements	(0.2)		(0.7)
Net periodic benefit cost	$	30.5	$	32.1

	Other Postretirement Benefits
	Three Months Ended December 31,
	2020		2019
Service cost	$	0.3	$	0.3
Interest cost	0.3		0.4
Amortization:
Prior service credit	(1.4)		(1.4)
Net actuarial loss	0.3		0.4
Net periodic benefit credit	$	(0.5)	$	(0.3)