Retirement Benefits

6 Months Ended

Mar. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Retirement Benefits

Retirement Benefits

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

	Pension Benefits
	Three Months Ended March 31,						Six Months Ended March 31,
	2015			2014			2015			2014
Service cost	$	21.5		$	19.6		$	43.2		$	39.3
Interest cost	41.6			43.6			83.9			87.2
Expected return on plan assets	(55.8		)	(54.5		)	(111.9		)	(109.0		)
Amortization:
Prior service credit	(0.6		)	(0.7		)	(1.3		)	(1.4		)
Net actuarial loss	29.6			24.9			59.6			49.8
Net periodic benefit cost	$	36.3		$	32.9		$	73.5		$	65.9

	Other Postretirement Benefits
	Three Months Ended March 31,						Six Months Ended March 31,
	2015			2014			2015			2014
Service cost	$	0.4		$	0.5		$	0.8		$	1.0
Interest cost	1.1			1.6			2.1			3.2
Amortization:
Prior service credit	(3.7		)	(2.7		)	(7.4		)	(5.2		)
Net actuarial loss	1.1			0.9			2.3			1.6
Net periodic benefit cost	$	(1.1	)	$	0.3		$	(2.2	)	$	0.6