Retirement Benefits (Tables)

3 Months Ended

Dec. 31, 2021

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

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

	Pension Benefits
		Three Months Ended December 31,
		2021		2020
Service cost		$	20.4	$	22.7
Interest cost		32.4		31.3
Expected return on plan assets		(59.4)		(60.4)
Amortization:
Prior service cost		—		0.4
Net actuarial loss		22.3		36.7
Settlements		—		(0.2)
Net periodic benefit cost		$	15.7	$	30.5

	Other Postretirement Benefits
		Three Months Ended December 31,
		2021		2020
Service cost		$	0.2	$	0.3
Interest cost		0.3		0.3
Amortization:
Prior service credit		(0.2)		(1.4)
Net actuarial loss		0.2		0.3
Net periodic benefit cost (credit)		$	0.5	$	(0.5)