Retirement Benefits (Tables)

6 Months Ended

Mar. 31, 2014

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,
	2014			2013			2014			2013
Service cost	$	19.6		$	23.0		$	39.3		$	46.1
Interest cost	43.6			40.0			87.2			80.2
Expected return on plan assets	(54.5		)	(56.4		)	(109.0		)	(113.2		)
Amortization:
Prior service credit	(0.7		)	(0.7		)	(1.4		)	(1.3		)
Net actuarial loss	24.9			36.1			49.8			72.4
Net periodic benefit cost	$	32.9		$	42.0		$	65.9		$	84.2

	Other Postretirement Benefits
	Three Months Ended March 31,						Six Months Ended March 31,
	2014			2013			2014			2013
Service cost	$	0.5		$	0.6		$	1.0		$	1.2
Interest cost	1.6			1.5			3.2			3.1
Amortization:
Prior service credit	(2.7		)	(2.7		)	(5.2		)	(5.4		)
Net actuarial loss	0.9			1.1			1.6			2.2
Net periodic benefit cost	$	0.3		$	0.5		$	0.6		$	1.1