Retirement Benefits (Tables)

3 Months Ended

Dec. 31, 2019

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,
	2019			2018
Service cost	$	22.8		$	19.6
Interest cost	34.2			39.6
Expected return on plan assets	(61.2		)	(61.2		)
Amortization:
Prior service cost	0.2			0.3
Net actuarial loss	36.8			19.5
Settlements	(0.7		)	(0.2		)
Net periodic benefit cost	$	32.1		$	17.6

	Other Postretirement Benefits
	Three Months Ended December 31,
	2019			2018
Service cost	$	0.3		$	0.2
Interest cost	0.4			0.6
Amortization:
Prior service credit	(1.4		)	(1.4		)
Net actuarial loss	0.4			0.2
Net periodic benefit credit	$	(0.3	)	$	(0.4	)