Retirement Benefits (Tables)

3 Months Ended

Dec. 31, 2015

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 December 31,
	2015			2014
Service cost	$	22.1		$	21.7
Interest cost	42.5			42.3
Expected return on plan assets	(54.7		)	(56.1		)
Amortization:
Prior service credit	(0.7		)	(0.7		)
Net actuarial loss	31.1			30.0
Net periodic benefit cost	$	40.3		$	37.2

	Other Postretirement Benefits
	Three Months Ended December 31,
	2015			2014
Service cost	$	0.3		$	0.4
Interest cost	0.8			1.0
Amortization:
Prior service credit	(2.8		)	(3.7		)
Net actuarial loss	0.6			1.2
Net periodic benefit income	$	(1.1	)	$	(1.1	)