Retirement Benefits

3 Months Ended

Dec. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Retirement Benefits

Retirement Benefits

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

	Pension Benefits
	Three Months Ended December 31,
	2016			2015
Service cost	$	24.1		$	22.1
Interest cost	37.8			42.5
Expected return on plan assets	(56.2		)	(54.7		)
Amortization:
Prior service credit	(0.8		)	(0.7		)
Net actuarial loss	38.0			31.1
Settlements	0.2			—
Net periodic benefit cost	$	43.1		$	40.3

	Other Postretirement Benefits
	Three Months Ended December 31,
	2016			2015
Service cost	$	0.3		$	0.3
Interest cost	0.6			0.8
Amortization:
Prior service credit	(1.5		)	(2.8		)
Net actuarial loss	0.5			0.6
Net periodic benefit income	$	(0.1	)	$	(1.1	)