Retirement Benefits (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Pension Benefits [Member]
Components of net periodic benefit cost in income from continuing operations
Service cost	$ 17.8	$ 19.3	$ 52.9	$ 51.9
Interest cost	41.6	40.0	123.5	119.8
Expected return on plan assets	(52.2)	(48.1)	(154.3)	(144.1)
Amortization:
Prior service credit	(0.5)	(1.1)	(1.5)	(3.2)
Net actuarial loss	16.0	10.6	47.8	31.6
Net periodic benefit cost	22.7	20.7	68.4	56.0
Other Postretirement Benefits [Member]
Components of net periodic benefit cost in income from continuing operations
Service cost	0.8	0.9	2.6	2.8
Interest cost	2.5	3.1	7.6	9.4
Amortization:
Prior service credit	(2.6)	(2.6)	(7.9)	(7.9)
Net actuarial loss	1.7	2.1	4.9	6.3
Net periodic benefit cost	$ 2.4	$ 3.5	$ 7.2	$ 10.6