Retirement Benefits

6 Months Ended

Mar. 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 March 31,						Six Months Ended March 31,
	2016			2015			2016			2015
Service cost	$	21.8		$	21.5		$	43.9		$	43.2
Interest cost	42.2			41.6			84.7			83.9
Expected return on plan assets	(54.4		)	(55.8		)	(109.1		)	(111.9		)
Amortization:
Prior service credit	(0.7		)	(0.6		)	(1.4		)	(1.3		)
Net actuarial loss	31.1			29.6			62.2			59.6
Net periodic benefit cost	$	40.0		$	36.3		$	80.3		$	73.5

	Other Postretirement Benefits
	Three Months Ended March 31,						Six Months Ended March 31,
	2016			2015			2016			2015
Service cost	$	0.3		$	0.4		$	0.6		$	0.8
Interest cost	0.9			1.1			1.7			2.1
Amortization:
Prior service credit	(2.9		)	(3.7		)	(5.7		)	(7.4		)
Net actuarial loss	0.7			1.1			1.3			2.3
Net periodic benefit income	$	(1.0	)	$	(1.1	)	$	(2.1	)	$	(2.2	)