Retirement Benefits (Tables)

9 Months Ended

Jun. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs

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

	Pension Benefits
	Three Months Ended June 30,						Nine Months Ended June 30,
	2016			2015			2016			2015
Service cost	$	22.1		$	21.3		$	66.0		$	64.5
Interest cost	42.5			41.7			127.2			125.6
Expected return on plan assets	(54.8		)	(55.7		)	(163.9		)	(167.6		)
Amortization:
Prior service credit	(0.7		)	(0.7		)	(2.1		)	(2.0		)
Net actuarial loss	31.2			29.6			93.4			89.2
Net periodic benefit cost	$	40.3		$	36.2		$	120.6		$	109.7

	Other Postretirement Benefits
	Three Months Ended June 30,						Nine Months Ended June 30,
	2016			2015			2016			2015
Service cost	$	0.4		$	0.4		$	1.0		$	1.2
Interest cost	0.8			1.0			2.5			3.1
Amortization:
Prior service credit	(2.8		)	(3.7		)	(8.5		)	(11.1		)
Net actuarial loss	0.6			1.2			1.9			3.5
Net periodic benefit income	$	(1.0	)	$	(1.1	)	$	(3.1	)	$	(3.3	)