Retirement Benefits

3 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Retirement Benefits

Retirement Benefits

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

	Pension Benefits
	Three Months Ended December 31,
	2017			2016
Service cost	$	22.2		$	24.1
Interest cost	38.8			37.8
Expected return on plan assets	(61.2		)	(56.2		)
Amortization:
Prior service cost (credit)	0.2			(0.8		)
Net actuarial loss	28.3			38.0
Settlements	—			0.2
Net periodic benefit cost	$	28.3		$	43.1

	Other Postretirement Benefits
	Three Months Ended December 31,
	2017			2016
Service cost	$	0.3		$	0.3
Interest cost	0.6			0.6
Amortization:
Prior service credit	(1.3		)	(1.5		)
Net actuarial loss	0.4			0.5
Net periodic benefit cost (income)	$	—		$	(0.1	)