Retirement Benefits (Tables)

6 Months Ended

Mar. 31, 2012

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost

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

	Pension Benefits
	Three Months Ended March 31,						Six Months Ended March 31,
	2012			2011			2012			2011
Service cost	$	18.1		$	17.7		$	36.0		$	35.1
Interest cost	42.0			41.2			83.9			81.9
Expected return on plan assets	(57.2		)	(51.4		)	(114.2		)	(102.1		)
Amortization:
Prior service credit	(0.6		)	(0.5		)	(1.2		)	(1.0		)
Net actuarial loss	23.7			15.9			47.4			31.8
Net periodic benefit cost	$	26.0		$	22.9		$	51.9		$	45.7

	Other  Postretirement Benefits
	Three Months Ended March 31,						Six Months Ended March 31,
	2012			2011			2012			2011
Service cost	$	0.6		$	0.9		$	1.1		$	1.8
Interest cost	1.8			2.6			3.6			5.1
Amortization:
Prior service credit	(2.7		)	(2.7		)	(5.3		)	(5.3		)
Net actuarial loss	0.6			1.6			1.2			3.2
Net periodic benefit cost	$	0.3		$	2.4		$	0.6		$	4.8